Of the Seto Inland Sea. I

STUDIES ON MARINE GAMMARIDEAN AMP皿PODA OF THE SETO INLIAND SEA． 11）

Klz6NAGATA

Inland Sea Regional Fisheries Research Laboratory，Hiroshima

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CONTENTS Page PART I．Systematic Account． Introduction．．，，，，．．＿＿．．．．．，＿＿＿＿。．．＿．＿＿，＿9．。131 Material（副≠h FJg。1）。133 Acknowle（1gements ．135 Historical review of systematic works＿。＿．136 List of the species descr王be（i in this paper．．138 Systematics（ω露h F匁3．2－15），，．141 Key to the27families in this paper．．．，141 Lysianassi（1ae．．＿＿．．．＿＿＿。＿。＿。＿，＿，．＿．．142 Ampeliscidae＿．．＿．．150 Argissi（1ae ．154 Haustoriidae ．155 Phoxocephalidae ．156 Amphilochidae ．157 Leucothoi（iae ．157 Stenotho圭dae ．160 Liljeborgii（iae＿＿．．，、＿＿、．＿．160 Oe（iiceroti（1ae ，＿．．．＿．．．．168

PART I．SYSTEMATIC ACCOUNT

Introduction

Benthic marine gammaridean amphipo（1s form an important component among small crustaceans of littoral sea bottom，an（1are one of the important members of benthic communities in company with polychaetes and molluscans quantitatively．It is also well known that gammari（leans are frequently foun（1 in the stomachs of benthos－feeding fishes as prey－animals．Nevertheless，the

1） Contribution No．111from the Naikai Regional Fisheries Research Laboratory，Fisheries Agency．

Pub1．Seto Mar．BioL Lab．，X皿（2），131－170，1965．（Article8） 132 K。NAGATA

systematic knowledge of the marine gammaridean amphipods on the coast of Japan is very insumcient． The caprellidean an（i hyperi（1ean amphipods have hitherto been reported by Huzio U』TINoMI（1947〉and．Haruhiko IRIE（1959） respectively，and the terrestria1，subterranean，an（1fresh water gammarideans by W．M．TATTERsALL，Masuzo U’益No，K6z6AKATsuKA，Taku KoMAI，and by other several authors．As a matter of fact，the poverty of the systematic knowledge has much interrupted the a（ivance in ecological researches of the Iittoral area．The gammari（lean fauna of the littoral area is rich both in the number of species and in quantity，and as far as I examine，it is reasonable that a fairly goQd numbers of endemic species were found in the present study，though benthic amphipods have been generally（1eeme（1to show a wide range of（iistribution． Recently J．：L．BARNARD（1959〉gave a very interesting figure conceming the number of familiesンgenera，an（1species of subor（ier Gammari（iea of the world described up to the year1956：

Families 57

Genera 605 Species 3146

Accor（1ing to habita亡，they are divided as follows：

2376Marine and brackish species Stream and lake species 400 Lake Baikal species 232 Terrestrial species 88 Subterranean species 50 About200species of gammaride3ns are now kept in my hand，taken from the coast of Japan．It is interesting to put them in systematic order，bu隻 frustrating，especiaIly，when there are no available references in Japan． I have，therefore，requested available copies of benthic amphipo〔is to the col・ 1eagues in the foreign countries．Howeverンit seems to be very hard to accomplish the work very soon．I am now examining a large number of specimens from the various localities of the Japanese coαst，which are sent to me by several ecologists for identi丘cation．On completing the present stu（1y it will afford an information to the geographical（listribution of the fauna，an（i will give a basic knowle（lge to the study of benthic communities being un（1ertaken by some ecologists． Most of material for the taxonomical study have been taken from the Seto Inlan（l Sea．The species from the Seto Inland Sea were usually foun（1 also on all the other Japanese coasts，from the west coast of Ky盒sh血to Mutsu Bay，the northemmost bay of Honsh血．These inlan（1bays belong to“warm temperate”area，so far as the water temperature is conceme（i．I believe Gσ〃z卿σ7づ46σ％ノ1卸z1うみづカ04σ o∫渉h6 S6’o 正κ1α％4S6σ，1 133

that almost all the species commonly found in the Japanese inshore waters are represente（1in this paper．

Material

The sources of material here dealt with are summarise（1as follows（see Fig．1）： Area I：Kasaoka Bay，material compose（i of284specimens taken by Ekman－Lenz bottom sampler（0．02sq．m．）（1uring the perio（is from Jan．1953to Mar．1956；depth，2。1－15．5m l collected by R．KITAMoRI＆S．KoBAYAsHI。 Area II＝Fukuyama inlet，50specimens from13collections carrie（10ut seasonally between Mar・1954and Jan・1955；depth，2．2－4．5m l collecting gear an（1members both the same as above． Area III：Hiuchi Mada，27specimens from10stations by Okayama－maru （Okayama Pref．Fish．Exper．Stat．），Mar．22－26，1954；depth2，2－25．Om，both collecting gear an（l members are the same as above． Area IV：Mihara Bay，31368specimens from9seasonal surveys between Feb．1956and Mar．1957；（1epths of low－water marks to about25m，Ekman－ Lenz sampler＆bottom－1ayer net（see NAGATA1960，ng・1）2collected by R．KITAMoR正，S．KoBAYAsHI，an（1the writer． Area V：Estuary of the Ota，Hiroshima Pref。，399specimens from4 seasonal surveys between Mar．1956an（10ct。19561depth O．4－11。6m，Ekman－ Lenz sampler，collected by R KITAMoRI＆S・KoBAYAsHI・ Area VI：且osonosu，north of Hoso Shima，Hiroshima Pref．1629specimens from4seasonal surveys between Oct．1956and Feb．1957；（1epthンshallower than3．O m；Ekman－Lenz sampler＆bottom・layer net，collecte（1by R・KITAMoRI， S．KoBAYAsHIンand，the writer． Area VII：Inshore waters of Momo Shima，Hiroshima Pref．，766specimens， Jan．23，1957；depth，1。5－10．5m，Ekman－lenz sampler＆bottom・layer net，col－ Iecte（1by R。KITAMoRI＆S，KloBAYAsHL Area V皿：Estuaries of the Kanzaki（Mar．28an（131，1958）and the Yodo （Aug．29，1958），Osaka Bay，20specimens from the pollute（i wate area l（iepth， shallower than10m，Ekman－Lenz，collecte〔1by R。KITAMoRI＆Z。K6BE。 Area IX－a：Front of Ono－Branch of our laboratory，OnouraンHiroshima pref．，intertidal area，May27，1959125specimens found among eelgrass （Zo惚耀郷郷）expose（1in low water，collecte（1by K。FuNAE。 Area IX－b：The same area as above，Zos≠6解belt near low－water marks， 911specimens obtaine（i at a depth of O、5m in low water，by pushing a coarse net strongly so as to drag the sea一且oor；May11，1960，collected by K．FuNAE ＆the writer． Area IX－c：The same Zoε渉θ名σbelt as above，July27an（128，1961；56 134 K．NAGATA

3d 1鱗、、Y・識・顯 lV灘羅oshima 職魯綿娩講．ポ、 lvl鞭噂篭驚翻，V・・謹．』畠盤、群黙 XIII ゆ曽 III 露魎命麟警“ 蒙覇懸温⑳ 恥難，職犠 XIV 麟「4繊』℃、 θ 34 騨居肉、難黙び螺紅鹸 o 鯉簡．轄－繋鰻多「 SHIKOKU 砂

講嚢蓉・d藷襲灘擁轟 1

3dl薄 3d 灘騨細1 伊 32’ 133 0 Fig． 1．Map of Seto Inland Sea showing the coIlecting area of materials dealt with in this paper，exclu（1ing“Area VIII”。 specimens，collecting metho（1as above，collected by K FuNAE＆the writer、 Area IX一（1：The same belt as above，1671specimens by noctumal surveys between Aug．30an（i Oct．10in19621horizontal－tow by plankton net along thesurfacewatersofO．8－3．9min〔1epthinhighwater（seePartII）． Area X：Neighbo皿ing waters of Atata Shima，hiroshima Bay；328speci－ mens from4collections by bottom－layer net；June2－3，1959；15．0－13．O m in depth；collected by R KITAMoRI，K FuNAE，an（1the writeL Area XI－a：Eastem area of Su6Na（1a，5673specimens from14collections by bottom－layer net，between June12－16，19591depths about30－60m；collect－ ed．by R．KITAMoRI（see Fig．47，an（1Table4）。 Area XI－b：The second survey of the same area as above，3689specimens from29collections by bottom－layer net，between Sept．2－5，19601（1epths ca． 10－60m；collecte（1byR．KITAMoRI（seeFig。47，an（1Table5）。 Area XII：Front of the beach of Itsukaichi，Hiroshima Pref．，Oct．19， 1960；185specimens foun（1together with the excrements of oyster in the ex－ perimental basket suspende（1from the oyster・raft at a（1epth about10m from the bottom；collected by U．KoBAYAsRI。 σσ”z吻αプ」4θσ％ノ1郷力hづ1り04α oノ’hθ Sθ渉0 1n〆αn4S6σ，1 135

Area XIII－a；Near Kanematsuhana，south coast of Miyajima，Hiroshima Bay；Sσ7gσ33襯zoneン2－4m in depth；Dec，8，1961135specimens fom（i by formalin－washing of algea taken by“ebikogi”net；collected by R OKAMoTo ＆K。FUNAE． Area XIII－b：The same location as aboveンJan，8，19621220，specimens fom（1among algae obtaine（i by the same net as above l collecte（i by R． OKAMOTO＆K．FUNAE． Area XIV：Beach of Okam皿a－jima，Aki Nada；61specimens l May31， 1962；among algae or under stones near low－water marks；collected by K FUNAE．

Acknowledgements

I wish to express my sincere gratitu（ie to Professor Otohiko TANAKA of Ky血sh血University for his deep interest an（i great attainments on this amphipo（1work followed by his critical rea〔ling of the manuscript．On the other hand，I am〔ieeply grateful to the following Persons for their continuous encouragements an（i many valuable advices throughout the course of this work：Prof．Huzio UTINoMI of Seto Marine Biological Laboratory，Ky6to Uni－ versity；prof．Sadayoshi MIYAKE of KyOshロUniversity；Prof．Haruhiko IRIE of Nagasaki University・ I am also indebted to the following Persons of our laboratory for their generous supPort of this fundamental work of the且sheries research through the comprehensive faculty；Dr・Tasuku HANAoKA・the former（1irector of our Laboratory；Mr．Yoshikazu YAMANAKA，the present director；and all of other members，especially to Dr。Tomowo HAYAsHI who has provi（le（1me with many facilities required for the progress of this study・My hearty thanks are also （iue to the next gentlmen for the collection and presentation of materials； Mr．Zir6K6BE who is a sta鉦of Osaka Prefectural Fisheries Experimental Station，and all of the others who are members of our Iaboratory，particularly to Dr．Ry6nosuke KITAMoRI，one of Polychaete workers in Japan，who has placed a great deal of his coIlecting amphipo（i materials at my（1isposal throughout the course of this work，and to Mr・Katumi FuNAE for his many kin（1an（1generous ai（1s ten〔1ere（i（iirectly me in preparing this paper。 Here，I wish to take an oPPortunity to express my acknowledgements for the following foreign workers who have kindly sent to me a large number of available references complying my requests to the pursuit of my work： Dr．」．Laurens BARNARD，Beau（iette Foun（iiation，Califomia；Dr・Thomas E・ BowMAN，U．S．National Museum，Washington，D。C。，who has particularly as－ sisted so kindly as to send me many still available reprints of the late Mr． Clarence R．SHoEMAKER；Dr．Desmon（1E．HuRLEY of New Zealand Oceanogra・ 136 K．NAGATA

phic Institute，who has taken a warm labor in sending to me many copies of the late Prof．Charles CHILToN and the late Dr．George M．TRoMsoN，both New Zealan（1workers in the former yFearsンas well as his own offprints l Dr．Keith SHEARD of Westem Anstralian RegionaI Laboratory，Nedlands； Prof．Sandro RuFFo of Museo Civico di Storia Naturale，Verona，Italy；Prof， Erik DAHL of University of Lund，Sweden；Dr．Lejeune P．H，de OLlvEIRA of Institute Oswaldo Cruz，Rio de Janeiro，Brazil；Dr．Charles Howar（1 E．DMoNDsoN of Bernice P．BishoP Museum，Honolulu；Dr．E。L．BousFIELD of National Museum of Canada，Ottawa l Dr．Torben WoLFF，Zoological Museum， Copenhagen，w血o has selected an（1sent to me many copies of all the still available papers by the Iate Dr．K．STEpHENsEN；Dr．Eric L MILLs of Osbom Zoological Laboratory，Yale University，New Haven，Connecticut；Dr．Pierre BRuNEL of Station de Biologie Marine，Grande－Rivi6re，Gaspe・Sud，Quebec， Cana（ia：Pro£．E．GuRJANovA of Zoological Institute，Leningrad l Dr．M．E． VINoGRADov of Oceanological Institute，Moscow l Dr。MARGuLls of Moscow Lomonosov University．

Histor圭cal Review of Systematic Works

Recor（1s of the gammari（1ean group in the systematic works from the coast of Japan have hitherto been only made fragmentally by STEBBING（1888）， STEpHENsEN（1932，1933，1938，1944）ンIwAsA（1934，1939），DAHL（1945〉，SHIINo（1948）， and IRIE（1956）． STEBBING（iescribe（i3species in“Challenger Report” of1888；且卿躍hoθブ勿o擁oσwas foun（1at“Bay of K6be”，Seto Inlan（1Sea，an（1the other two were collecte（i from“Kuroshio”region． STEpHENsEN in his4papers mentione（i above（1escribe（123species，of which14were directly recorde（i from marine inshore localities of the Japanese coast．IwAsA in1934an（11939 described13species and2subspecies of only two families（Talitri（1ae and Hyali（1ae），two species of which were terrestrial amphipods．DAHL in1945 reported on4species of only Ampeliscidae。In1948，SRIINo described a new boring amphipo（1，Chθ1％郷伽剛o側吻彪，an（l in1956，IRIE reported on two species， E7伽ho％伽3δ7σsづ1翻3づ3an（1Co名oヵh伽翅σoh67％s卿吻belonging to the family Corophii（iae。 Following is a list of all the marine and brackish water species from the coast of Japan（lescribe（1by several authors mentione（l above； z肋o％銘伽砂％〃o∫463BATE，STEBBING（1888）． 0πho解6％6盟z麗soz‘losz‘s，n．sp．by STEBBING（1888）。（now falls to）一〉0κho吻6％61140h〃6％3お（HELLER）by K．Hl．BARNARD（1925

an（1 1932）．＊／1”ψ舜ho6ブ4カonづoσ，n．sp。by STEBBING（1888） →∠4」σ067！03σBATE7herein by thg writer。 0σ窺”zα7ゼ40σ％ノ1吻1）hづカoづα o∫渉h6 Sα〇五％」α％4S6α，1 137

EJσ3別oカ％εブσψonJo％ε，n。sp．by STEPHENsEN（1932）．＊Co〆oρh勉郷％o％o∫，n．sp．by STEPHENsEN（1932）． C6初づnαノのりo漉oσ，n、sp．by STEPHENsEN（1933）． Pα7h卿」6勧7蜘郷ズ3，n．sp．by IwAsA（1934〉l IwAsA（1939） →・P．ooho渉θ％3♂3（BRANDT）by GuRJANovA（1951）．＊0侶‘zn4ぢ漉6名6〃‘zノσカoア露oα，n．sp．by STEPHENsEN（1938）。 0名ohθ3あσμ切ons歪s KRφYER l IwAsA（1939）；STEpHENsEN（1944）．＊070hθ3オ翔ヵ1磁醜sぢs japonica（TATTERsALL）；IwAsA（1939）l STEpHENsEN （1944）；was TαJo，zohθs癩ブ砂o擁oσin TATTERsALL（1922）． 070h6sあ44づ吻σ短DERJAvIN l IwAsA（1939）；STEpHENsEN（1944）一〉0．ooho渉θ％56s BRANDT by BuLYcEEvA（1957）． 0κhθsあα∫o郷吻醐σ，n．sp．by IwAsA（1939）；STEpHENsEN（1944）一・0．ρッ4躍々o毎DERJAvIN by BuLYcEEvA（1957）．丁認o名じh63ガ4み万’o STEBBING；IwAsA（1939〉；STEPHENsEN（1944〉．＊恥α」6％o槻6～θσ1σn4毎6TEoMsQN；IwAsA（1939）一〉π．9名翻漉607漉s（KRφYER）by K．H，BARNARD（1916）。＊功σ」630h吻伽（HELLER）；IwAsA（1939）．恥α1θ40〃“sづCHEvREux；IwAsA（1939）l STEpHENsEN（1944）．恥σ1θ9解o漉3，n・sp・by IwAsA（手939） →π．伽αs漉SHoEMAKER on account of“homonym”．＊。411070hθ3！θs勉αll601％s STEBBING l IwAsA（1939） →ノ1．伽g％3魏3DANA by J・L BARNARD（1954a）・ z4Jloκh65≠6ε卿αllool銘30σ7初σ伽s，n．subsp．by IwAsA（1939） →ノ1．σ％9％s協s oα7勿zσ如3automatically．＊∠4〃oκh6吻sμ％雁oo7勉5（HELLER）l IwAsA（1939）；STEpHENsEN（1944）．＊ハ491」彪ゐo紹αノzσ，n．sp．by STEPHENsEN（1944）。 ∠4漉so9σ彫翅α7％s（∠4痂so8・σ郷郷σ彫s）吻60∂s屠（DERJAvIN）；STEPHENsEN（1944）一一∠4．（z4．）加9観6κsゼs（DANA）by J。L BARNARD（1954a）。ノ1勉so94”z那σ7κs（Eo9‘z吻”zσ7働ε）彦ツ9∫（DERJAvIN）；STEPHENsEN（1944）・＊！1漉30810溺卿4彫3（Eogπ別卿4耀3）卿％勿伽弼（TATTERsALL）；STEpHENsEN（1944）； wasθσ規別α郷5in TATTERsALL（1922）．＊五御力甜hoo sh伽zづ～％67zs∫s，n．sp。by STEPHENsEN（1944） →z4．％」躍σSMITH by J。L．BARNARD（1954a）．＊ノ1卿力露ho6卿σoγ％7％3，n．sp，by STEPHENsEN（1944） →且．」σ06πosσBATE by J．L．BARNARD（1954a）． Sz粥4窺ρhガho6ρ1％錫zo3α，n．sp。by STEPHENsEN（1944）・＊ノ1鯉ヵ61おoαゐoo勉，n．sp．by DAHL（1945），

＊∠4 解ク6」2s6σ駕お盈ノ粥3’3，n。sp。by DAIIL（1945）．＊ノ1卿ヵ61♂30σsp．cf．δ名θ擁oo7吻ε（CosTA）by DAHL（1945）一〉。4。扉罐co7擁s（CosTA）by’the writer．＊Bψ」♂sブ勿o漉o％ε，n．sp．DAHL（1945）， 138 K．NAGATA

Ch6h‘グ召ゐ名8舘04z644！σ，n．sp．by SHIINo（1948） →〈匹ゆρooh61％形δ名ωづoσ％4磁4（SHIINo）by J．L．BARNARD（1959－b）．＊E耽’ho％勉3δ翅sづ1づ6％εづ3DANA；IRIE（1956） →E．御gn砿DANA，herein by the writeL ＊Co名oρhづz‘卿σoh67％sJoz‘”z CosTA；IRIE（1956）。 The species which has been afterwards revise（1are indicate（i with a mark of arrow，an（l those described herein are marked with an asterisk． 0名oho膨％彫％s6％lo5％εmentione（l above was at五rst transferre（l into the gems Ozoカo耀％θoヵs♂3by STEBBING himself（1906），then fallen to a synonym of O．o雇16％sお（HELLER）by K．H．BARNARD （1925），after that，the genus O7－ oho耀％θoヵ3づ3was fuse（l under the gems name of Oπho膨彫〃αby K．H．BARNARD （1932〉，an（1thus the present name of the species is Ozoho耀彫〃σoh蜘％3づ3 （HELLER）． Conceming Pα7h顕16勧7ゼJoπ3づ3designate（1as a new species by IwAsA，SHoEMAKER says in his peper of1956，“DERJAvIN（1937）ma（1e IwAsA’s species a synonym of BRANDT’s species∠4Jloκh6吻s oohoオ6郷づ3，which was ma（1e the genotype of a new genus Pα鯉〃oκh6吻s by SHoEMAKER（1941）。DERJAvIN at the same time transferre（1BRANDT，s species to Pσ7勿惚，making it Pσz勿σ1θ oo乃o伽sゼε．”ハ4θ」吻彦o灘nσis a record from Makinoshima，Fuzan，Korea described by STEPHENsEN，but known also from the Japanese coasts by the writer，and z4儒og伽卿σ剛s（E・）勿gぢand∠4・（E・）σ朋醜4σ16づare recorde（1from fresh water localities in his paper of1944，but the two species are both foun（l also from the brackish waters along the coasts of Japan．み As far as the writer knows，the speci丘c information mentioned above are all of the taxonomic records prior to the writer’s work from Japan．

L1ε≠ o∫≠hθ Sρ60招3五）6307助64♂π ThおS67彪30〆P41り6グ3 Lysianassidae

1．！1％o，z』μη％g召罪ヵσo麺o％s GURJANOVA 2。 070ho卿gπ8〃σ」〃’07σκs，sp．nov． 3． Lθが4のoo76％卿砂甜力認GURJANOVA 4。 Eκ46∂o％7α”¢」74δ”Js CH工LTON 5． z4ガsあσs汐σo甥o％s S6HELLENBERG 6．S吻θJooh6i燃ho卿（COSTA） 7． Soo4ηzθ3∂αhκ（KIRφYER） 8． iohnoヵ％ε㍍％7％εCOSTA Ampelisci（1ae 9．且卿力θκ304670擁oo7廊3（COSTA） 10．A卿θ」ぢεoσoツoJoρ3WALKER 11。 14郷ρθ」ε04600々∫DAHL 12． ∠4吻φθあsoσ〃露s盈宛銘sJεDAHL 13．イ4〃ψgあsoσ郷歪hσ74θ銘sJεNAGATA

14． z4魏ρθ」∫soσ禰」肋勿％s歪εNAGATA 15． βlyδκεノ妙o勉o％3DAHL Argissi（1ae 、

04”z耀σ〆づ46召π ノ1〃2クみぎ勿440プ’h6 Sθ’o Z％」4％4S64，1 139

16、∠479∫3s4h㈱α勘θs（NORMAN） Haustorii（1ae 17．ひ70ずhooヵ％Joho〃α（CosTA） Phoxocephali（iae 18．Pσプ砂ho鵜εoo吻伽（SARS）匂 1g． L6ρ診o，ho∬z‘3／1‘zJoσ≠％εSARS 20． πσゆ初宛卿∫hσ7σθπ3」3NAGATA Amphilochidae 21． G露σηoヵsJs擁Jo7‘」θs J．L．BARNARD Leucothoidae 22． Lo％oo≠hoo初oづ3αRoBERTsoN 23． Lθ躍o渉hoθ4」‘z如J．L．BARNARD Stenothoklae 24。S蜘o≠hoθ9σ〃θ細3WALKER Liljeborgii（lae 25． L〃ブθδ07g∫σノのりoπ∫σσ，sp。nov， 26．』乙〃ノ6西o〆gど4367〆冨’4，sp．nov。 27． 1d％％6〃α oh〃たθ％3ゼ3CHILTON 28． ∫4躍zθ〃αo％〆の∫4αo渉ッ」4，sp．nov， Oe（licerotidae 29，Po漉oo7吻εσ伽解α吻％s（BATE＆WEsTwoQD） 30。 βα疏y御gJoπ♂oπ9’卿σ％πs（BOEGK） 31．砿oκoo％Jod63」伽z，zoρh〃％sブ4カoπ記％3，subsp．nov． Synopii（lae 32． S卿oμσ％μ7α彫α7伽σDANA Tironidae

33． S』y77ho尭6sヵαo歪foπs，sp・nov・ Calliopii（iae 34． Loμσ翅ρhoカ％3πo郷召紹α」¢％碗αθ（THoMsoN） Pleustidae

35． PJθ％ε∫6sρσ％oカ♂σ （KRφYER） 36。 P474ク」ε％ε’θ3扉o％3カ06493，sp。nov， Atyli（1ae 37． Aち7伽εノ‘ゆo擁伽3NAGATA MelphidipPidae

38，砿oゆh∫ゴゆφ召み076α」∫s BOECK 39．砿θ」カhづ4ぎカρσgJoδosσ，Sp．nov・ 40．磁ゆh躍吻θ伽s伽碗α，sp．nov． 41． M6」カhづsσ％αノσρoπゼoσ，sp．nov・ Pontogeneii（1ae 42， Po漉09ε紹ゼ‘z703かσ如GuRJANovA Cammari（1ae 43． ∠1擁309α卿郷α7％3（Eo9α彫卿召郷s）伽％碗伽1認（TATTERSALL） 44．耽κ如彦07θ4％αSTEPHENSEN 45．盈」露446κガo％」4’4，sp．nov． 140 K．NAGATA

46．砿θ」露σオzめ270z‘」σ≠σ，sp．nov． 47．盈♂伽ノ勿o％加，sp．nov． 48．1吻醐387磁吻」脚，sp．nov． 49。砿σθ76JJσ勿銘漉〃2伽σ（BATE） 50． C67α400％3（P6％ガ0674400z‘ε）04ψθ躍3Js SHEARD 51． E短o，Jsσ6’o％gπ∫召（BRuzEL工us） 52・ E短oρお6〃4sθ6hθJJo％s歪ε（CHEvREux） 53．砿ggσ」％70餌3¢g躍3HOECK Dexamini（1ae 54、 Pσ74dθ∬σ翅初6ヲ初497ε」（STEBBING） 55． Pσ解4郎‘z”¢伽θδ‘z7nσ7漉SHEARD Talitridae

56． 070hosず毎μ召≠伽ε♂3ノσρo擁6σ（TATTERsALL） Hyali（1ae 57． Hッα」θg7σπ4Joo7π∫3（KIRφYER） 58．五砂σ」6εoh吻4あ（HELLER） 59， A〃oκhθs∫θ3απg％ε∫％3DANA 60。五〃07σhos≠θs力勉郷∫oo7擁ε（HELLER） Aori（1ae 61，且07‘z≠‘γゆゼoσKIRφYER 62．イ4070」4召s ooJ％励吻WALKER 63． Ao70躍633θo％鴛づσCuRJANovA Photidae

64． P乃oガε7θ初hα7づ’KRφYER 65．P乃o’∫310順伽4惚（BATE＆WEsTwooD） 66． E欝ッ3’hθ％3グ砂o勉傷s NAGATA 67． E麗7ys！ho％εz‘だ％o”z露NAGATA 68． Po400θ70φε」37z〃ぢ4σ （STエMPsoN） Ampithoi（1ae 69．ノ1魏が！ho6」σoo7≠oεαBATE 70． A彫ρ露ho6のσ〃4σSMITH 71．イ4形ρ露ho67σ卿o％認AUDouエN 72． ∠4別が∫hoo o短6n如あs DANA Ischyroceridae

73。 1σsεσf4Jo¢’4（MONTAGU） 74。ハ獲070ゴα3sαo％別676π3ゴs（STEBBING＆RoBERTsoN） Corophii（iae 75． Co70ヵh吻吻砂oJ碗碗07（PALLAs） 76． Co70ρh勉吻¢ohθプz‘3∫o％鯉CosTA 魑 77． Co70カhづ％彫 07σ3s♂oo勿20 Bγz626」∫z63 78． Co70φh伽佛％θ％oづSTEPHENsEN 79．Co70助伽卿初3鰯os％卿CRAwFoRD 80． Co70φh∫％彫盈πσ勉07露 sp．nov． 81、 E万oオhoπ勿3ヵ％g襯劣DANA 82， C7の¢4ゼ4∫θ7θJJσノσψo％あ4STEPHENsEN 83． Cθ7σρ％3’z‘伽」α7ゼ3SAY 84． U％oJoJo〃σ」観σ彪CHEVREux Gσ郷彫σグ」4θσ％ 14％z汐hゼカ04σ o！ずhθ S6≠o 正％1σ％4S6α，1 141

Podoceridae

85。 Po400θ7％3吻oo，¢ερゴo％z‘3（STEBBING） Types are preserve（1in my hand for the present（KN No．）．

Systematies

K6ツオo ’h6ノ＝α”zゴ1づos 46so短わ6d ぢ％ ≠hづsカαカ67

1． Antenna1，peduncular article l stout，with accessory Hagellum；mandible with cutting e（ige almost smooth，with palp l article30f gna亡hopod2elongate＿＿Lysianassidae

1． These characters not combined＿，．＿．＿9＿．．＿．＿。＿＿。．．．＿，．。．＿，＿9．．．＿．．＿＿＿＿、＿．＿。2 2．Hea（1tapering，truncate l eyes extemally simple，with2－4comeal lenses l antenna l wi亡hout accessory且agellum l telson more or less cleft………・一…Ampeliscidae 2．These characters not combined＿．。．．9。．9．．＿。＿．＿、．，．．．＿9．．＿．＿．．＿．＿．．9．．．＿＿D＿9．＿＿・3

3． Coxal paltes1－3decreasing graduaIly in size＿。．．＿．＿。＿＿＿＿＿＿＿＿＿，．。＿Argissidae

3。 C・xa1Plates1－3n・tdecreasinginsize＿．．＿、．．．＿．＿．．．．．＿一．．．＿＿＿。＿＿＿・……・一…・4 4．Antenna l with accessory flagellum；mandible with palp normal l peraeopods 3－5adapted for burrow孟ng by expans圭on of joints and armature of many spines an（1setae ．＿．．．．＿．．．．＿．．．9．＿9＿．＿甲＿。ひ．．＿■＿9＿9．＿。＿＿．、＿．．“＿＿9。＿一■亀一・一■一・一一 5

4． These characters not combined ＿．．＿ひ、．．＿．．＿■．＿．．＿．．＿ら．，。．．＿．．＿．．＿．．．＿．＿＿■＿』 6

5． Peraeopod4not greatly longer than peraeopod5 ．…．……一．………………・…・・gHaustoriidae

5， Peraeopod4greatly longer than peraeopod5＿＿。．．．．＿．＿、＿＿＿＿，＿、＿．＿Phoxocephali〔1ae 6．Upper Iip incised；max皿ipeds normal；uropod3b孟ramous l telson elongatey taPc「in9，entire一．…g…．・＿陰．＿．．＿，．．＿．噂＿＿＿＿噂＿＿＿＿、＿＿＿．＿＿＿＿Amphilochidae 6． These characters not combined＿。＿。．．＿9＿．．．．＿．．＿．＿．。．．＿．．＿．＿．＿．．，＿＿．＿＿… 7

7． Antenna l withou重accessory Hagellum l maxillipe（1s more or less abnormal l telsonentire＿．．＿一．．＿．、．．，．．＿。一＿．．．＿．．＿＿．＿。＿＿，＿＿ひ．．＿一＿．．．9，．＿。．9＿ひ．．＿，＿．＿＿8

7． These characters not combined．．．9＿．．．．．＿9．．．．．．．．＿．．＿．．＿．＿．．＿＿．．＿，．＿。＿辱＿．e．．＿一， 9 8．Gnathopod l chelate；uropod3biramous．…・．一。…一…・………g………一…Leucothoidae 8．Gnathopod l not chelate；uropod3with a single2－jointed ramus＿＿g＿＿Stenothoidae 9． Mandible wit血molar weak or wanting；maxi11ipeds，inner plate small；gna・ th・P・dsland2str・nglysubchelate；tels・nm・re・rlessdivided…一・……Lilieb・rgiidae

9． These characters not combine〔1＿ひ．．．＿，．．．＿．．＿＿．＿。．．＿．＿．＿曾＿＿。．．＿＿＿＿………・10 10。Head pro（1uced into a denexed rostrum，or front of head bent down at right anglest。d。rsalline；eyes，whenpresent，d・rsallyc・ntigu・us・rc・nHuent…一一11 10，Thesecharactersn。tc。mbined＿、＿．．＿．．．＿，＿＿。＿，．＿。＿。，．．＿．，．＿．＿。…………一13

11。 Antema l without accessory flagellum；article30f mandibular palp large l perae・P・d5much1・ngerthanperae・P・d41tels・nentire一・Oedicer・tidae 11． Antenna l with accessory Hagellum；article30f mandibular palp smal1， peraeopod5not much longer than peraeopod41telson cleft 12 12．Perae・P・dsland2witharticles4and5dilated．ひSyn・piidae 12。Peraeopods l and2with articles4and5narrow ．Tironidae

13． Coxal Plate4 usually excavate（l behin（i；peraeopods l and2not glandular； telson variable；animal usually not domicolous．． 14

13． Coxal plate 4 usually not excavated behind；peraeopods l and2frequently glandular；tels・nentirelanimalusuallyd・mic・1・us 22 14． Mandible with palp＿。＿。 15 14，Man（1ible without palp 20 15。 Telsonentire 16 15． Telson eleft．．。． 17 142 K．NAGATA

16 Rostrum weak l mandible with molar well developed＿。Calliopiidae 16 Rostrum usually well marked；mandible，molar feeble，。．Pleusti（lae 17。 Pleon segments5and6coalesced。．＿．．．。．Atylidae 17． Pleon segments5an（16not coalesced 18 18 Ante皿a l without accessory flagellum＿＿＿＿＿．POntOgeneii（1ae 18 Antenna l with accessory Hage11um． 19 19。 Peraeopo〔1s and uropo（is long an（l very slen（1er ．MelphidipPidae 19． Peraeopo（1s and uropods not very slen（ler ．Gammaridae 20 Uropo（13，both rami well developed ．．．．Dexaminidae 20 Uropod3，0ne ramus wanting or very small＿。＿ 21 21． Antenna l shorter than peduncle of antenna2．＿＿．Talitri〔1ae 21。 Antenna l longer than pe（iuncle of antenna2＿＿＿，Hyalidae 22 Uropods2and3，0ne or other wanting or ru（1imentary。．Po〔10ceridae 22 Uropods2and 3 develope（1 23 23． Pleon usually（1epresse（i；uropo（13uniramous．．．＿．＿，Corophiidae 23， Pleon compressed l uropo（13biramous 24 24 Uropo（13not uncinate 25 24 Uropod3，0uter ramus un6inate＿。．．。． 26 25． Gnathopo（111arger than gnathopo（12＿．Aoridae 25． Gnathopod l not larger than gnathopod2＿＿＿．．＿．．Photidae 26 Lower lip with principal lobes notched，＿＿＿＿g ．Ampithoidae 26 Lower Iip with principal lobes not notche（1 ．Ischyroceridae

Family LYSIANASSIDAE

K6ツ ≠o ’h6 3汐θoJθ5 0∫L‘y3震z銘αs3づ4σθ

1。 Peraeopod l powerfu1，chelate ．＿。＿。＿．＿．．，．．＿，＿。＿。＿。＿．．、．．……＿・Eπ4ωo％耀痂7励”」5 1・Peraeopod l normal，simple＿＿．＿。＿＿＿＿＿＿．．＿＿＿＿＿＿＿．．■＿＿＿＿＿＿．。＿＿＿ 2 2・Coxa1，10wer front angle concealed …………一……・・………・………・……∠4πs蕗αεμo甥o％3 2。 Coxa1，lower front angle not concealed＿＿＿＿．＿＿．甲＿＿＿．＿＿．＿。＿＿＿＿＿＿＿麿 3 3． Branchial vesicles pleated on both or one side．．．．．．＿＿．＿．＿。＿。．＿。＿。＿．＿＿＿＿＿．＿ 4 3曾Branchial vesicles simple ．．＿＿。＿。＿、．．＿＿，＿。＿、＿，＿＿．＿＿。＿．＿＿＿＿＿．＿＿＿＿＿ 6 4． Gnathopod l subchelate＿，、＿。＿，＿．＿。＿。．．＿。＿．．、。．．．＿＿＿＿。。，＿＿ノbzo％‘y躍％％9σ諾ρσo方20％3 4．Gnathopod l simple＿，＿．，．．＿、＿，＿。．．＿．．甲．＿。＿。＿齢＿．．．．．＿。．＿．＿g．．．．＿。。の＿＿＿＿＿ 5 5。Epimeral plate3，10wer hind comer rounded＿。．＿＿．＿。．．＿．．＿。．＿．＿．．．＿．．、Sooα〆％θ3∂碗あ 5・ Epimeral plate3，10wer h至nd comer toothed一・．…・……・．．…・…・…・…・…・…・．，10肋oゆ欝オ劒郷ε 6．Mandibular palp attached not behind the molar＿＿＿＿＿。．＿＿＿＿S60ゆθJooh6」7％s hoμ∫ 6。Mandibular palp attached behind the molar．＿．．．＿＿．．＿。．＿＿＿＿．＿、＿ρ＿＿＿＿＿ 7 7．Pleon segment4with a triangular dorsal carina prominetly proiected．．◎．＿、。L6カ’4θカθσ70％郷∂πノσ2’ 7，Pleon segment4without such a projection＿＿．＿＿．＿＿＿g、＿．＿＿＿070ho耀n6〃σ互オ≠07σ〃ε

ノ1％o％ク劣π％9σ鑑1うσo〃20％3GURJANOVA

z4％o銘夕κ％g砿力σ6甥o％εGuRJANovA1962，p，219，丘gs，68a－b． z4％o％夕κ伽zρ％JJo躍63，（non BATE），NAGATA1960，P。166ンpL13，且gs．1－6．

ル勉’θ吻J o％α吻％64：Area IV（484specimens），VI（2），XI－b（1）；up to14．9 mm in length l depths of3－52m．Nearly all of them were obtained from σσ〃z”zσ7づ4θσ％〆1”zカhJρ04‘z o∫渉hθ S6ずo 乃zJ‘zπ4S6σ，1 143

Sts．6－80f Mihara Bay，deeper than10m in depth． 1～翻α漉s：As l have mentione（l in my prece（iing paper，1felt it（ii伍cult to i（1entify the specimens with certainty either as14．郷g砿or as！1．α彫卿1－ loJ46s，because of having no opportunity actually comparing the specimens of the two species；z4．併n加〃o♂‘」63was recor（1e（1at34。58！N，139029／E，off the Pacific coast of Japan by“Challenger”Expe（1ition．Accor（ling to GuRJANovA7s key of the genus z肋o銘銘（1962，p。211），the present specimens fall into the present subspecies，therefore the specimens reported un（1er the name∠4。卿加〃o漉s in my preceding paper should be attribute（1to this subspecies of z4．郷g砿。 The subspecies is particularly（1istinguishe（l from BATE’s佛鋼llo♂4θ5by the shape and color of eyes，and the structure of male uropod2。 This subspecies is also known by me from the other coasts of Japan，e。9． the shallower waters of Mutsu Bay，and the Japanese coast of Japan Sea； they are both the same form as that of Seto Inland Sea in characters・The present specimens are，however，not entirely agree（i with GuRJANovA’s五gures of the species taken from the Japan Sea．Mandibular palp normal in shape l its article2not so stout． Front lower comer of the first pleonal epimeron not so strongly pro（iuce（i but rather similar to that of his ngure of14・郷9礁綴9醐（1962，五9．67a）．Lower hind comer of the thir（l pleonal epimeron with the tooth of variable shape，usually acutely produce（l in the smaller specimens 6－8mm long，while pro（iuce（1to a short，broad tooth in the larger ones of 12－14mm long．Peraeopo（i3，article4surely stout and similar proportion of length to its article5，but in peraeopo（14，article4not so short in propor－ tion to its article3． Pe（iuncular article 50f antenna2usually subequal in length to article4，but rather Ionger in the larger of13mm long． Eyes flask－shaped，but the lower posterior comer usually Iess produce（1backwards2 rather similar to that of the specimens of this subspecies from Okhotsk Sea figured by GuRJANovA（1962ン丑g．69〉。The most remarkable character of the present specimens is that article50f gnathopod l is fairly long，comparing with its article6（see NAGATA1960，pl．13，fig。3）． Dづ3渉7あ％ガo％： Japan Sea an（i Okhotsk Sea

070ho溺6n6〃α 」π渉oプαJJs，sp． nOV。

070ho勉θ％61如sp．，NAGATA1960，P，167，PL13，figs．7－18・

Mσ≠07鰯6耀吻％64： Areas I（2），IV（258），V（70），VI（20），VII（66），IX－b（7）， IX－c（4）ンXI－a（2），XI－b（6），XIII－b（2）．Total：437specim6ns，up to6。5mm in length；from depths of low・water mark to56m。 P6soガ卿o％＝Lateral lobes of head in female triangularly pro（1uced，in male rather more narrowly pro（1uced．Eyse oval，slightly wi（1ened belowン mo（ierate in size，an（l its facets of light re（1reticulate（l with milk－like white 144 K。NAGATA

in fresh，compose（10f about10－11in number，but entirely vanishing away an（1imperceptible in spirits．Coxa l of nearly uniform wi（lth bearing3－4 setae in a oblique row on the surface of insi（ie l coxa40f a harmonious boot・ 1圭ke shape，right－angularly excavated behind，the excavation relatively shallow comparing to the total（iepth of the coxa，the Iower hin（110be relatively long， narrowing towards the apex l coxa50f equal breadth and（iepth，pro（1uce（1 （iownwar（1s behin（1；coxae6－71ike in those of O．」θが4％1σ（GuRJANovA1962，丘g．44b）．Pleonal epimera1－3with the posterior margin minutely serrate，in the first an（1thir（1epimera only in the lower half of the margin． Pleon segment4in female with a wide，shallow（lorsaI（1epression，in male narrowly and steeply depressed（in female of6．2mm long，rather resembles the outline of Hgure（pL13，fig，16）shown as a male of4。7mm long in my preceding paper，while in male of6．5mm long still more narrow，（leep，an（1steep）． Epistome with a broadly rounding lobe projection forwards beyond the upper lip．Antenna l in male，the first pe（1mcular article more stouter and some－ what shorter than in female；antema2，Hagellum in male（iistally threa（i－ 1ike，reaching the full length of the animal。 Gnathopo（11short an（l stout，article5subequal or a little shorter than article6，not pro（1uce（1to a linguiform posterior lobe l article6with the anterior an（1posterior margin nearly parallel each other，the palm nearly transverse and slightly concave，bearing a minutely comb－like margin，an（1 （ie丘ned by a spiniform angle accompanied with two stout spines at the base l article7with an accessory tooth on the inner e（1ge like in O・％伽σ（KRφYER）（CHEvREux＆FAGE1925，p．71，Hg．62）．Gnathopod2，article5about two times as long as article6，0f which the（iistal en（i subacutely pro（1uced，showing a minute cheliform with the finger．Peraeopo（1s3－5，article2shorter than the rest of the Iimb，the hind margin minutely serrated l the shape in peraeopod 3as seen in the figure of my prece（1ing paper，pretty constant through many spec孟mens at my han（1，but in peraeopods4－5they are somewhat of variable shape，usually similar to those of O．1θが4％」σ（1．c．）．All丘ngers of peraeopods 1－5（io not show such a strong form as seen in GuRJANovA’s figures for O．伽渉θ7nz64宛（GuRJANovA1962，fig．45b）． Uropod2，inner ramus not constricted；uropod3with the rami fully Ionger than the peduncle，inner ramus subequal to the basal article of outer ramus，the secon（i article of the outer ramus short an（1small，the inner margin of the outer ramus in male lined with many marginal plumose setae．Telson rather slender，more than1．5times as long as broad，tapering towar（is the apex，cleft to three fourths the length，each lobe bearing an apical spine an（1 a lateral spimle．Integument comparativelyF in（1urate（i，partly coloring with Iight re（i in fresh，but entirely whitish in spirits．肋1吻ヵ6：KN No．3111，male，4．9mm．丁抄o Jooα1吻：St．2，north coast of Momo Shima（Area VII），Jan．23，195714m in depth，Zo3渉卿belt，Mud，W．T． Gα別解σ7146σ1z ！1ηz汐hづカ04σ o∫！h召 S召≠o Z％」σ％ゴS6α，1 145

9．80CンCl．18．16％o at bottom－layer respectively． 1～6彫σ娩3：I have thoroughly referre（l to all of the known species belong－ ing to this genus listed by J．L．BARNARD（1958，P。96），in which30species are reported until the en（i of1956from the worl（1，but no species agree（1well with the present new one；particularly among theln，0．n傭4（KRφYER）known from the European coasts，Mediterranean，and Ceylon，is the most nearest to the new species． Recently，GuRJANovA in his paper of1962（lescribed five new species from the north－westem parts of the Paci盒c，in which three species（0．」6が伽1α，0．癬6吻θ4招，an（10．吻鰍50％1σ）are relate（l to the new one．Eowever，the present new species could not still satisfy me in referring it to any of them．This new one is commonly foun（1in the inshore waters of the inland bay along the coasts of Japan，from Mutsu Bay to the west coast of Kynsh直，which belong to“warm temperate”area of Japan。It may be one of the distinctive species representing the endemic feature of these

areas．

Lθ勿4ゆ6076％勉∂πブ4～づGURJANOVA

Lgが4勿oo7％吻∂甜ブ爾J GuRJANovA1962，P・338，fig・112・

砿σ！θ7ゼα16耀雁％4：Areas I（1），IV（72），VI（1）．All up to7．4mm long，from （iepths of3ぞ5m． R翻σ娩3：The specimens are wonderfully well allied to GuRJANovA’s （iescription and figures of L。∂∫吻～♂，except for the following minor details： there is no oblique row of setae on the丘rst coxal plate；marginal setae on article 6 0f gnathopo（i l not hooke（1 at apex l there are only five pairs of dorsal spinules on talsqn；the dorso－posterior en（l of pleon segment3feebly carinate and shows no such an attractive projecti、on as to be uptume（11y raised． The shape of（10rsal projection on pleon segment4rather more resembles that of L．Jogゆoo7％丘gured by CHEvREux＆FAGE（1925，p．63，figs、 50－51）．The present specimens are closely related toムloπgづoo7形（BATE＆ WEsTwooD），except for the appearance of ca血ae both on the dorsal line and 。nthepedunculararticle1・fantenna1；thedi鉦erenceapPearedt・ben・t essential in character but to be only a variable character cause（1 by the （1iscrepancy of localities，so l have assigned the specimens to L．lo％gづoo7n6in my memoran（lun for a long time． However，in closer cxamination of L・ 1卿6。糖，access・ry且agellum・fantema1，stranget・say，entirelywanting》 an（1telson strongly tapering towar（1s the apex and more longer，nearly three times as long as broa（1。The specimens have also a close resemblance with L．60％郷GuRJANovA（1951，p．277，figs．146447）taken from the shallow waters， 15mindepth・ftheRussianc・ast・ftheJapanSea，butthed孟screpancy・f the dorsal appearance can not still satisfy me inτeferring them to五。θo襯 146 K．NAGATA

1）ゼS渉7づ6％！づ0％： Bering Sea，near Olyutorskogo，40m．

E％46∂o％7σ吻”σ房あs CHILTON

（Figs．2－3）

Eη4ωo銘7σ”z∫74房μ3CHILToN1921，p．44，figs．4a－q．

ル観爾4」6x伽吻6： Areas XI－a（1），XI－b（4）． Length，3．5－10．5mm，all probably maIe；（iepths，32－56m． 1～翻砿乃s：Tne present specimens somewhat di丘er from CHILToN’s（1escrip－ tion an（1figures of E．卿加房1♂5．Lateral lobes of hea（l more narrowly pro〔1uc・ ed。Coxa4not abruptly uptumed at the lower hind comer．Mandibular palp

轟

D 、

E B ㌧㌧ト’蕊舐

1 ㌔

ーヲ 1

ヂペ、 ’・、1 C

Fig．2。 E惚600π解吻名励薦εCHILToN．Male・10．5mm：A・1ateral view of body．Male，7．1mm：B，mand圭ble l C，maxilla l l D，maxilla21E， maxillipe（1s；F，telson（upPer and lateral view）， Gσ〃z簿zσ7」46σn ／1魏力hJカ04σo∫！h6S6渉o 乃zlαπ4S6σ，1 147 more elongate，armed with more long setae on articles2and3．Gnathopod 1，articles5an（i6combined are much longer than article21article2proxi・ mally broad，with the anterior margin roughly（1entate，the（ienticles become smaller and（1enser by（1egrees towards the proximal portion；finger minutely （1entate on the mid（lle of the inner e（1ge． Peraeopo（11has the most prominent character6n the〔1istal portion of the leg；article6shows a echelon－formation，the postero－proximal portion pro（1uc・ e（1backwards to the posterior en（l of article4，while the posterodistal en（i projecting forwar（ls an（i forming a chela with the五nger；the palm evenly convex，regularly and minutely dentate，an（1deHned by a stout tooth（some－ times entirely evanescent），accompanied with a pretty（iistinctive spine・ The third pleonal epimeron with such a minute point at the lower pos一

Fig．3・E％4ωo協σ雁7⑳躍3CHILToN・Male・7・1mm A7 gnathopo（111B，peraeopod1． terior corner，that it is apt to be overlooke（1，but the hin（1margin not serrate below，unlike in CHILToN’s figure。 Telson tapering，longer than broad，the apex narrowly rounde（i。Among the（iifferences mentione（1above，the shape of article60f peraeopod l an（l of telson are truely remarkable。The roun（1－ e（i shape of telson in CHILToN’s specimen may have happened to be observe（1 when it was（1epresse（i down with a cover－glass。Article60f peraeopod l is invariable in shape among the specimens at hand，between3．5－10．5mm in length． The present specimens are，however，quite well conformed with 雁7砺1づs in all the other major characters，so that l coul（i not consider the specimens to be essentially（1istinctive from E。吻解6薦s。 P魏励醜o％： Australian seas（east coast of Frinders Island，Bass Strait）． 148 K：．NAGATA

∠47」εガσsカαo〃20％s SCHELLENBERG

且万3ガσ3ρσoJ弄6寓s ScHELLENBERG1936，p．153．ル観θ吻」θ劣伽惚4：Area XI－a，4specimens（see Table4）l up to2．5mm

in length；（iepths，20－50m． R卿σ廊：The present specimens，though they are all small，appear to agree we11with ScHELLENBERG’s（1escription． This species has surely some agreements both with∠4．伽吻伽3an（1∠4．n6gl6伽s（SARs1895，pL17，fig。2and P1．18シfig．1，respectively）． In the specimens at hand，coxa 6has also the lower hin（110bes produced below to a long curve（1process as ill z4。fαJo漉％s described and figured by STEpHDNsEN（1923，p．73，fig．14），who says in the paper，“the feature is also foun（1among the materials of A魏癬伽s an（1z4。彫810伽3．” Such a“ganz kleinen stumpfen Zahn”as described by ScHELLENBERG for 五．勿o玩6％3，is not foun（1at the lower hind comer of the third pleonal epimeron．Peraeopo（1s1－5，article6pro（iuced at the tip to a short tooth－like process，an（1this character is（1escribed also in STEBBING7s （1iagnosis of 1906 for且。％6gJ召o魏s（p．50）．Telson cleft to two－thirds the length．The other points like in ScHELLENBERG’s（lescription，except in the number of且agellar articles of antemae．However，a little hesitation remains behin（1for the i（ienti血ca－ tion of these specimens，as no Hgures of this species are given by ScHELLENBERG，and if the more正arger specimens be accepted in future，the specific characters will be more confirmed． Pガ5！7i伽房on：N．E．of Union Bay，east side of Vancouver Is．，12－16fm．

Sooヵ610ch切7％εho1）θ♂（CosTA）

Cσ〃歪so卿σ彦γφフo擁，DELLA VALLE1893，P1．26，figs。1－15；SARs1895，P，54，pL19，fig，2。 SooρθJoo舵か％s ho力砿 STEBBING 1906，P・62；CHEvREux ＆ FA GE 1925，P・55，figs・39－40’ GuRJANovA1951，P．241，fig．106，

ルf伽吻」砿㈱伽4：Area XI－b，2female specimens；7．1and7．8mm in length；from（1epths of40－52m． R6駕α娩3：The specimens well agree with this species figure（1in the references cited above；the shape of coxa4especially with that of DELLA VALLE7s one．The shape of epistome is use（1by DAEL（1959，p．221）as one of the （1istinctive characters among the genera of the S60カoJoohσかz63 group； SooヵgJooh切プ％3，」Pσ7σoσ〃ガso窺6ンA露oz6i，S60ヵo’ooh認名o汐豆s，andβσ’h＝yoσ〃150吻‘z，but the protruding form of epistome beyon（i upper lip is not always a proper character for the genus稿Sooρ6100h切π‘3；it projects reaHy in S．o解％召伽3（SARs1895，pl．19， Hg．1），but not projects in S．hoカ61，as obviously seen in CHEvREux＆FAGE’s figure for this species．It is confirmed also in the present specimens，therefore （｝σ”z郷α7づ46σ刀丑”z汐乃♂カ04σ oノ！hθ S6！o 正％」σnゴSoσ，1 149

a revision may be needed in STEBBING’s（1iagnosis of1906．The outer plate of maxillipe（1s in the present specimens also nearly reaching to the en（10f article20f the palp，and article40f the palp not so slen（ler as in S。o名6％α！％3． D魏磁禰o％；North Atlantic，North Sea，Skagerrak，Kattegat，Baltic（Great Britain，Norway，Sweden），an（1Mediterrallean．

Sooσ7n6s∂σhlづ（KRφYER）

Sooσ解6s塀h躍SARs1895，P．44，PL16，血9。21STEBBエNG1906，P。57；GuRJANovA1951，P．226， fig．911GuRJANovA1962，P．308．

ル勧6磁」θ耀卿惚4：Area X皿一b，3female specimens；3．8－11，7mm in length l from depths of2－4m。 R翻α廊：The specimens agree well with SARs，figures．Eyes reniform， black．Lateral lobes of hea（1with the smooth distal margin．Oral parts entirely like in Sars’Hg皿es。Antenna1，Hagellum4－14jointe（i，accessory flagellum with2－6joints。Antema2，pe（1uncular article5shorter than article 4；flagellum with3－13joints・Gnathopo（i、1，丘nger simple，and smooth at the base。Third pleonal epimeron with the postero－lateral comer rounding，rather similar to that of CHEvREux＆FAGE’s figure of S．6がh名o汐hずh召1駕％εRoBERTsoN （1925，fig．34）。Telson scarcely reaching to the （listal en（i of pe（1uncle of uropod3．Branchial vesicles pleate（10n both si（ies． These specimens are undoubtedly assigned to the present species．It is noteworthy that such a boreo－arctic form is foun（i in Seto Inlan（i Sea． pづ3オ吻観o麗：In North Atlantic it（1escen（is southerly to the south en（1 0f Greenlan（1，an（11celan（1；in the North Pacific it extends，through Okhotsk SeaandBeringSea，southtoJapanSea（3－5to240mindepth）・

10hnoρ％3如％7％3COSTA

10h％o吻3，蜘欄，DELLA VALLE18937pL3・血9・1・pl・27・丘gs・1－22；WALKER1904・P・238・PL1・血9．3；STEBBING1906，P・53；K・H・BARNARD1916・P・123；CHEvREux＆FAGE1925・ p．48，血g，30． 10hπoρ％3εμ勉oo7勉3，SARs1895，pl・151STEBBING1906・P・521CHEvREux＆FAGE1925・P・47・ figs。28－29；GuRJANovA1951・P・220・fig・86・ Zoh％吻5ε67耽γ％3WALKER1909，p．328，p1。43，五g．1．

ハ4惚吻」6耀吻％64：0ne male specimen，8．4mm long from the stomach of benthos－fee（ling fish caught in the area of Bungo Sui（16（about40－60m），Jan・ 20，1960． R翻α廊：Though found from the stomach of fish，the specimen is not so damage（1and fully・available for identi丘cation．It agrees well with SARs7 丘gures for五3ρ初ゼoo7初3，except for gnathopo（11and peraeopo（13・ Antenna1，the（iistal（1entiform process of peduncle presents only on the 150 K。NAGATA

丘rst article．Gnathopo（i l much shorter than gnathopod2，while the finger with the expan（1e（1base，at which is armed with spines of variable size like in CHEvREux＆FAGE’s figure for五’砿ア％3．Article20f peraeopod3with the hind margin more deeply serrated than in the丘gure given by WALKER for 五36吻oπ剛3．The closer examination of the present specimen makes me approve of K．R．BARNARD’s opinion that the above－mentioned three species are together conspecific． Z万s≠吻％ガo％：Faroes，Norwegian coast，coasts of Irelan（1an（i France，and Mediterranean；South Africe，Seychelles，Ceylon，and Java Sea．

Family AMPELISCIDAE

K6ツ渉0酌θ3ρ60♂θS O∫ノ1郷力θ〃so掘σ6

1． Peraeopo（15．丘nger spiniform ，βッゐ」ゴεノ砂o漉o％s

1． Peraeopod5，finger lanceolate 2 2． Comeal lenses of two pairs＿。．． 3 2． Corneal lenses of one pair only。。 6

3． Third pleonal epimeron bisimate，．．。．．。．、A卿ρgJ魏σδ7θ痂07卿3 3． Thir〔1pleonal epimeron not bisinuate。＿＿＿ 4 4． Antenna1，pe（1uncular article2subequal to article l in length＿。∠4蹴ρ協s昭600々」 4．Antenna1，peduncular article2clearly longer than article L＿ 5 5． Antenna l in female not very much shorter than antenna2 ．z4吻ヵ6κs6α吻∫hσ7α6郷∫3

5． Antenna l in female very much shorter than antenna2．．．．．．！1翅ρθ」♂εoα郷ゴ肋吻κ3」ε 6。Hea（1produced into a broad rostrum＿＿．。14卿ψ読304σyoJo汐3 6。 Hea（1pro（1uced into a narrow rostrum＿。∠4郷ρθ」づ30α卿∫s餉∫6郷ズε

ノ1卸2ヵ6あsoσ δ76毎oo7％づs（COSTA）

（Fig。4ン1）

∠4彫ク6」おoα δ名召冨σ07初s，WALKER19047P，253ヌSTEBBING1906，P，100；CHEvREux 1911，180； STEPHENsEN1915，P．431K．H，BARNARD1916，P．132；CHEvREux＆FAGE1925，P，77，丘gs．67－68；ScHELLENBERG1928，P．6341K H．BARNARD1932，P。84；PエRLoT1936， P．277；K．H，BARNARD1937，P。1481ScHELLENBERG1942，P，146，fig。11gl REID1951， P．206，figs．10－15（with vars。）l NAGATA1959，P。265，fig．2；NAGATA1960，P．167，五別力9露30σsp．cf．ゐ7召擁oo7擁3，DAHL1945，P。9，fig。7， A窺ヵ6々30α」¢θ漉gσ如，SARs1895，p・169ンpL59，fig・1・

砿諺θ7宛」6辮吻％4：Areas I（30），III（9），IV（105），V（84），X（250），XI－a（2117）， XI－b（2162）．Total：4575specimens夕up to12．O mm in length；from（1epths of 5－53m．

1～卿α娩s：The specimens at han（1（lo not necessarily agree in（letails with DAHL’s description for the material from Japan，an（l it is unable to find any qualitative（iifferences between Japanese an（l European forms，except that the rami of uropod3more broader and the apices more rounde（i as seen in DAHL’s G4郷解zαγづ46σ％ノ1吻力hづρ04α o∫≠h6 Sαo 乃zJσ％4S64，1 151

丘gure。This species is very common on the littoral sea bottom as seen in Tables4and5，an（10ften found in the stomachs of various benthos－fee（1ing fishes taken from all over the areas of Seto Inlan（1Sea． p／3≠万伽ガo％： Northerly from Lofoten Is．，along European coastsンto the West and South Africa；into Mediterranean，through Red Sea，Gulf of Aden， the coast of East Africa，to Ceylon，Java Sea，an（1Japan，

o 1 1

＼ 7

ノイ

（Fig．4）（Fig・5） Fig．4，A噸ぬ諭6伽縮（C・sTA）：LA卿鷹師h脚襯sNAGATA：2－4・A翅勧3・4 ”漉加∫θ郷∫s NAGATA：5－7．（1，1ateral view l2，5，hea（1an（l peduncle of antennae； 3，6，fifth peraeopod；4，7，third pleonal epimeron）・ Fig，5．且膨」畑・ツ吻sWALKER：1，1ateralview・fmalel2，femaled・rsa1P「o丘1e・f urosome． A形ヵθ」歪εoσ価ε襯∫θ％s歪3DAEL：3，front of head l4，且fth peraeopod；5，6， male and female dorsal pro丘1e of urosome respectively．

z4吻olJsoσoツoJoカ3WALKER

（Fig．5，1－2）

A柳θ」づsoσoタoJoρs WALKER1904，p．253，pL2，且g．14；STEBBING1906，p，7221PIRLoT1936， P。280；K．王L BARNARD1937，P・149・ z4吻ヵθあsoσ砂oεπ5ゴs NAGATA1959，p。274，figs。9－11、

砿魏吻16駕吻鰐4＝Areas IV（2），XI－a（6〉，XI－b（31）l up to12．8mm in Iength；from depths of10－53m。 R6脚燃：WALKER described the female specimens of this species from 152 K。NAGATA

Ceylon，and my female specimens well agree with WALKER，s ones，except for the minor details．WALKER says that the head has“21arge con且uent crimson spots”at the anterior edge，therefore the comeal lenses are probably not one but two；in the present specimens the pigments of the spots soon fa（ie out in spirits，but the lenses are usually outlined by re（l pigments for a long time．Antenna1，the pe（iuncle has the ratio of raticle2to article l considerably variable in length l in female about1。5－2。0，in male2。O or more。 Antenna2，the peduncular article4in both sexes fully longer than article5． The（1i鉦erence of（10rsal pro丘le of pleon segment4in both sexes is丘gured here．And now，I am unable to（1istinguish qualitatively the present speci－ mens from WALKER’s material from Ceylon．It is pretty sure that五．蜘6競s designated by myself in1959is a synonym of A oッ6Joρ3WALKER， P魏励めo％：Gulf of Oman，Ceylon，East Indies，an（i Japan．

z4郷ρ61Jsoσδoo勉D入HL

。4彫ρθ」∫3αzδoo々づDAHL1945，P．2，figs，1－3；NAGATA1959，P、274。

砿α’67彪16翅吻％4：Areas I（2），皿（1），IV（18），V（9），X（1），XI－a（269），XLb （428）．Total：728specimens，up to11．Omm in lengthl froni（lepths of10－56m． 1～翻α嬬s：This species is found by DAHL from K6be Bay，12－15m in（lepth， an（1is wi（lely（listribute（10n the littoral sea noor of the southem coasts of Japan as well as Seto Inlan（1Sea． Dズs！吻観on：Known only from Japan．

。4彫勿IJ30α甥ゼs盈ぢ6π3」3DAHL

（Fig．5，3－6）

A卿ヵoμsoσ窺’3襯Jo郷Js DAHL1945，p。6，figs．5 6。

ル観67彪16耀吻％4：Areas IV（14），XI－a（127），XI－b（275）．Total＝416speci－ mens，up to8．2mm in length；from depths of30－56m． R翻α廊：Only one female specimen of this pecies has been reporte（1by DAHL from depths of30－50m，Misaki，Kanagawa Pref．，and the difference of （10rsal profile of urosome in both sexes is figured here． P麟吻醜o％：Known only from Japan。

ノ1甥ρ6JJsoσ卿づhσ7α6％s’3NAGATA

（Fig．4，2－4）

∠4彫ρ8〃s64吻づh‘z7σθ犯3Js NAGATA1959，P．266，figs．3－5；NAGATA1960，P．168．

砿伽万σ16卑4吻n64：Areas IV（4073），VI（8），VII（1），IX一（1（1），XI－a（132）， 0伽脚瑠翻且卿吻04σoμh6Sθ’〇五％伽45θσ，1 153

XI－b（83）。Tota1：4298specimens，up to9．9mm in length；from depths of2 to47m． 1～θ灘廊：The enormous number of material from Mihara Bay（Area IV） areobtainedatSts．6－8，whichare（1eeperthan10mindepth． P魏励鳩oκ＝Known only from Japan；Ariake Sea，and Nakaumi（Shimane Pref。）in other localities than the Seto Inlan（I Sea．

／1吻1う6あ30σ卯σ魏α’6％3づs NAGATA

（Fig．4，5－7）

A駕力61ぢ30σ館認々漉θ％3ぢ3NAGATA1959，P。270，figs。6－8；NAGATA1960P P．168．

ル観爾σ16耀雁％64：Areas I（1）ン皿（2），IV（70），XI－a（309），XI－b（141）．Tota1： 523specimens，up to8。9mm in length l from depths of4－56m；nearly all of the specimens from the soft bottom（ieeper than10m in（iepth．疏3！励躍o％：K：nown only from Japan；on the other coasts of Japan，found in Ariake Se＆，and Tomioka Bay．

βly房lsブ砂o初6％3DAHL

（Fig．6）

欝 1

募、

＼ 2 3

／．

f、o 、o

Fig．6． Bツ醗3 ゴ砂o吻o％3 DAHL：1， lateral view l2，丘fth peraeopo（1；3，third uropo（1；4，5，telson of male an（1female respectively． 154 K．NAGATA

β1ψ〃sブ¢o痂o％s DAHL1945，P．14，figs。8－10；NAGATA1960，P。168，pL13，figs，19－23・

M磁67鰯o羅吻％4：Areas I（24），II（2），III（10），IV（3302），V（42），VI（45）， VII（18），IX－b（6），IX－c（37），IX－d（21），XI－a（451），XI－b（263），XIII－b（1），Tota1； 4222specimens，up to10．O mm in length；（1epths of Zo5！6郷belt near low・water marks to56m． R粥σ飛3：This species is found by DAHL from depths200－400m off the coast of Misaki，Kanagawa Pref。，and is also known by me from the inshore waters of several localities；T6ky6Bay，Maizuru Bay，and the west coast of Ky血sh血．It is one of the most popular inhabitants on a littoral sea bottom， at least，in the southem coast of Japan，together with the species qf the genus∠4形汐6」♂30α（see Tables4an（15）。 This species also apPears very often from the stomachs of benthos－fee（1ing fishes caught in Seto IIllan（l Sea． z）醜吻漉o銘：OnlyknownfromJapan、

Family ARGISSIDAE

ノ17gJssα hσ窺σあρ6s （NORMAN）

（Fig。7）

∠4卿εsσhσ脚勧θs，SARs1895，pL481WALKER1904，p．246；STEBBING1906，p．277；ScREレ LENBERG1927，P．686，fig．76；SHoEMAKER19307P．255，丘gs・15－16；GuRJANovA1951， P．327，fig．1931STEPHENsEN 1940，P・411J・L・BARNARD1962，P・1511GuRJANovA 1962，p．392． A74ss¢s≠θ肋魏9∫，STEBBING1906，P・2771CHEvREux ＆ FAGE1925，P・90・figs・81－82；REID 1951，p．220．

ル忽67宛16羅雁noJ：Area XI－a，3female specimens；4。0－5．O mm in length； from（iepths of39－49m。 1～襯α焼3：The specimens are rather nearer toズ4．8勅伽gガform．Eyes truelywiththetypicalstructureof・4．hα働観ヵθs・Averticalcrestwhich separates both antennae in front of hea（1，forms a thin plate of trmcate shape above the epistome，and a emargination on either en（10f it，as just seen in SHoEMAKER’s figure foh4．hσ解α吻θs（Lc。），but the epistome triangularly more pro（1uce（l an（i reaching fully beyon（i the en（10f the secon（l peduncular article of antenna2．Coxa l postero－proximally expanded．Third pleonal epimeron like in SARsラHgure．Mandibular palp proportionally longer than in h召耀渉ゆ63 form，the third article twice as long as the secon（1．The丘fth peduncular article of antenna20bviously longer than article3as shown in3≠6みδ魏4from。 Outer ramus of uropo（13without the minute second article，but somewhat constricted on one side near the acute apex as figured here．The other characters fully coincide with both h4彫4ずゆ03and3’66み初8・づ． Gα吻％zα7づづθσ雑ノ1彫ρhゼρ04σoノ’≠hθ Sθずo 正％」σ銘4S6α，1 155

The above distinctive characters which have separated s勅6づ％g♂from h伽α拗θ3seem to be pretty well represente（1also in SHoEMAKER’s material of hα，繊’ゆ6s from Gulf of St。Lawrence。As SHoEMAKER suggested，in the paper of1930，I am now unable to see any specific difference between these two species．The wanting of eyes of3励δ魏gぢin BoNNIER，s original description is probably no essential peculiarity；CHEvREux＆FAGE（iescribe（l the presence of eyes comprised of4－8facets in the specimens of s励伽g∫．In a（1（1ition， WALKER reported the occurence ofハ．hα脚吻63from Ceylon，and J・L BARNARD says that z4．乃翻σ助6s pre（iominatly inbabits in the shallow area of Southem Califomia，though the species has been recorde（1from relatively deep col（l temperate waters．Therefore，A h伽σ勧θs shows a very wide（1istribution， from Arctic to tropical sea，an（11believe that the two species are essentially conspecinc．

＠ A

Fig．7，且7gJs3σhσ甥碗ゆθε（NORMAN）・ Female， 4mm：A，front of hea〔1and peduncular articles of antennae；B，apex of outer 「amus of uropod 3．

p餅7伽！加：From Ba伍n Bay through Gulf of St．lawrence to Casco Bay， Maine l northerly from Kola Bay through Norwegian coast，Iceland，Shetland Scotland，Azores，Bay of Biscay，southerly to the west coast of tropical Africa l Bering Sea，Okhotsk Sea，Japan Sea，Southem Califomia，and Ceylon。

Family HAUSTORIIDAE

乙ケo渉ho6ヵz40h6〃σ （COSTA）

ぴ〆o’ho6 戸那」とh6〃σンSTEBBING 1906ンP．工30；CHEvREux ＆ FAGE 1925・P・ 99，五9． 920 K．H。 BARNARD1916，P．143；K．H．BARNARD1955，P，83，fig．41－a．

Mα’θ7宛lo耀雁％θ4： Area XI－b，4female specimens，2．8－5．3mm in Iength・ from（iepths of54－56m。 156 K．NAGATA

2～鰯砿勉：The specimens agree pretty well with the figures of this species givenbyCHDvREux＆FAGE，exceptforgnathopod1．Anarrowshapeof article60f gnathopod l is rather similar to that of U．87加召14♂（CHEvREux＆ FAGE1925，p．99，且g．93）．On the other han（1，I have also some specimens assigne（i by myself to U．g7魏σ娩from Tomioka Bay，the west coast of Ky血sh血l the shape of the article6is，on the contrary，similar to that of U．加loみ6〃σ．The specimens of g7加α14ゼare，however，clearly distinguished from the present specimens of鋼loh6〃σby the proportional lengths of pe（1un－ cular articles of antenna 1，by the typical shape of peraeopo〔1 3，and the relative Iengths between articles5an（160f peraeopo（i4。In the specimens of卿Johθ〃α，peraeopod3has also clear article70f the slender form not cultriform，an（i the front edge entirely smooth or much minutely crenulate。 The present specimens are also related to U・07魏≠擁3GuRJANovA（1951， p．354，ngs．211，A－B）in the article60f gnathopo（i1，but seem to be（1ifferent from the la重ter in the structure of peraeopod3，in the more broader article 50f gnathopod2，and in the size of eyes，which is large in his specimen， an（i similar both in male an（I in female． Dづ3≠7伽ガo％：Scotland，west coast of France，Senegal，and Mediterranean．

Family PHOXOCEPHALIDAE

κ6y ！o ♂ho sカθo♂θs o∫Pho％oo6汐hσあ4σ6

1． Eyes present・・・・・… ■■一・一一・・ JRπ7のウho∬％ε oo％」αあ‘3 1． Eyes absent＿ 2 2 Eooded rostrum deHexe（1at apex＿＿、L6カ’01）ho躍％3∫αJoα’％3 2 Hooded rostmm not deflexed at apex ．1f召7カ∫雑彦4 卿♂hσ7σ6πsJs

P召7召力ho蜘6s ooz〆σ’z63（SARS）

P‘z7αカho躍％300％」碗％3，S、二、Rs1895，P・149，PL51；STEBBエNG 1906，P・137；STEPHENsEN 1925， P。162；STEPHENsEN1938a，P．150；STEPI｛ENsEN1940，P，201GuRJANovA1951，P，3647 fig。215；J、L BARNARD1960a，P。240，figs。27－28。 Pσ7αカho罪銘ε卿40％1σ吻ε，CHEvREux1900，P．34，PL5，丘9．5；STEBBING 1906，P・1381CHEvREux 1911，P．187，P1．10，figs．12－13；CHEvEREux＆FAGE1925，P．103，fig．97，

ルf伽吻」砿伽吻4：Areas IV（96），XI－b（1）11．9－5．O mm in length；from 10－56mindepth． p餅7伽あo％：“West of Greenland to710N，the Kara Sea（97QN），along the Norwegian Coast，Icelan（1夕East Greenlan（i，around the British Isles，into Mediterranean eastward to Tunisia，at South Africa，Japan2and in the eastem Pacific．”（」．L．BARNARD1960a，P．243）． 04盟z別σ7ゼ4θσ％ノ1％zカhゼカ04α o∫≠hθ S6≠0 1犯1αn4Sθα，1 157

Z，6汐’07）ho方z‘s〆41αz’％5SARS

Lθμoカho∬％3fαJoσ∫％s，SARs1895，P．147，pl，501STEBBエNG1906，P．136 STEPHENsEN 1925， P．161；STEPHENsEN1938aンP．1501J．L．BARNARD1960a》P．308。

1レ観6吻1θ躍伽吻4：0ne male specimen，2．5mm long from Area IV；two specimens from the stomachs of fishes caught off the coast of K6chi，Tosa Bay（June6，1958）．Depth：10－60m． Z）餅7必漉o％：“Greenlan（1，east and west coasts；Norway l North Sea； Skagerrak．Depth：56to2258m．”（J．L．BARNARD1960a，P。308）・

πσプカ伽彪吻づhα7σ6％sづs NAGATA

Hσゆ吻臨郷Jh‘z7σθ鋸sJs NAGATA1960，p．169，pls．13－14，figs．24－36．

ル観θ7鰯6鵜吻κ64：Areas I（1），IV（15），VI（12），XI－a（1），XI－b（1）。Total： 30specimens，up to3．Omm in length；from depths of2－52m、、Dづ5≠7伽≠伽：Known only from Japan．No specimens have been found in the area other than the Seto Inlan（1Sea．

Family AMPHILOCHIDAE α！σ1zoρsづs毎lo746εJ。L BARNARD

G露伽o，εお加Jo7磁εJ，L。BARNARD1962，P・131・fig・6・

M伽吻」砿翻吻4：Area IX－d，10specimens，up to2。5mm in length；from the surface water in high tide，at low・water mark。 R翻α廊：In gnathopo（120f the present specimens，the stout spine were not seen at the postero一（1istal en（l of article2，an（1also on the anterior margin of article6．Otherwise they call for no remarks． ∂ガ3’万伽”oκ：Lower Califomia，intertidal and subti〔iaL

Family LEUCOTHOIDAE 醜”o渉h6吻oJ6εo∫Lθ％oo≠ho蜘θ

Third pleonal epimeron，the lower hind comer toothe（1．。，Lo銘ooずho6 勿zo歪sσ Thir（1pleonal epimeron，the lower hin（1comer rounde（1 。L6駕0∫δ00 σ」σ渉4

Lθzκo渉hoθ 乃zo∫34 ROBERTSON

（Fig．8）

L6寓oo飾oθ伽o∫3σ，STEBBING1897，p。35，pL 10 STEBBING1906，P．1671CHEvREux＆FAGE 1925，p．123，丘gs．117，120。 158 K：．NAGATA

M碗吻」6劣伽吻4：Area VII，3specimens，3．0－4．3mm in length l4、O m in depth（St．2），Zo3オ脚belt，mud；W．T．9．80Cl Cl18。16％。，Jan．23，1957． 1～翻召廊：The only peculiar feature is that the thir（1pleonal epimeron bears the double teeth at the lower hin（1comer，the lower one smaller，and the sinus above the large one not so（1eep as seen in European form．Otherwise， the specimens hol（1well with the characters hitherto been described． Pぢs’励観o％：Scotland，Atlantic coast of France，Mediterranean，and P West Africa．

Fig、8。 Lθ麗oo≠hoθ動oづε¢ RoBERTsoN． Sex？，3mm：Lower posterior comer of third pleonal epimeron．

Lθ％oo！ho6σ」φαJ．L．BARNARD

（Figs．9ン10）

L召％ooJhoθσ如如」．L。BARNARD1959c，P．19，pL1， Lθ％ooずhoθ卿彪ゴ卿σ（？），J．L BARNARD1952，P．9，pl．1．

ル鰯θ吻」疏伽枷4：Areas XIII－a（3），X皿一b（1）；up to12．3mm in length； depths of2－4m。 R粥砿ゐ3：The specimens comparatively well agree with J・L BARNARD’s （1escription an（1丘gures，except for the following points：Article4in peraeo－ po（ls1－5somewhat more robust an（i we11（1eveloped。Coxa l not so broa（l at the anterodistal comerl coxa4in lateral view is poor in my drawing，and the actual shape is nearly straight or rather slightly concave at the frontal margin．Gnathopod1，article2stout an（1robust，much expan（1ed proximally in the larger specimens（11．0－12．3mm long）l article6not narrow at the pro－ ximal portion，but tapering towards the distal en（1．Uropod3with the peduncle much powerful，about1．5times as long as the rami。Telson more shorter and broader．Maxilla2in my specimens is typical as seen in SARs’丘gure of L．吻n卿7卯（1895，pL100）；it may be unusual form in BARNARD’s specimen． θσ卸z盟zσ万づ6α％！1勉1）hJカ04αo∫渉hθ Sθ渉o 乃zJ4％ゴSθσ，1 159

醗 1

2 r ￥

」

Fig．9． L9％oo’hoθ σ」σ如 J．L．BARNARD：17 1ateral view；2，telson l3，丘rst gna毛hopod。

zz彰砿 BA C D

Fig． 10。 Lθκoo渉hoε α」碗‘z J．L．BARNARD． Female ovig。》11mm：A，uropo（13；B，mandibular palp l C，maxilla21D，max皿iped。

Unfortunately，I cou1（1not refer to ScHELLENBERG’s descript孟on and 丘gures、of L．雁勉脚known from the tropical coast of West Africa．This species is also foun（i by me from Tomioka Bay，the west coast of Ky負shO。 1）魏7伽あo％：California（Morro Bay and Newport Bay〉． 160 K．NAGATA Family STENOTHOIDAE S競o≠hoθ9π1伽sJs WALKER

S競o’ho6go〃o槻s WALKER1904，p．261，pl。3，丘g．191WALKER1909，p．3310K．H．BARNARD 1916，P，1541ScHELLENBERG1928，P。640；K，H．BARNAKD 1937，P， 153；REID 1951， P．228，fig。271J．L．BARNARD1955，P、3，f｝9．1． SJωzo≠ho6076κ％」碗σCHEvREux1907，P，471，figs．1－3．

1吻渉07翅6耀痂％θ4：Areas IX一（1（7），XII（19）；up to4．7mm in length．Both collections taken from the surface water at（1epths of3－10m． The specimens agree quite well with J．L．BARNARD’s丘gures drawn from Hawaiian materials．・0σ3ず7伽ガo％：Caribbean Sea（Puerto Rico），West and South Africa，Mediter－ ranean，Re（1Sea，Zanzibar，Seychelles，Ceylon，an（1Pacific（Gambier Archipelago an（1Hawaiian Is．）．

Family LILJEBORGIIDAE

K6‘γ Jo ≠h6 sカooづ63 0∫L歪1ブ6δ079露4α6

1． Gnothopod21arger than gnathopod1＿，．．．．＿。＿ 2

1． Gnathopod2smaller than gnathopod1＿．．甲．．＿。 3 2 Peraeopod5，article2weakly serrate behin（1．，L露ゴθ西079歪σグσρ0銘ゴ0¢ 2 Peraeopo（15，article2deeply senrate behind．．、L〃ノ6δ079ゼσεθ7プσ∫σ

3． Gnathopod1，五nger in male abruptly curved＿，。五づ％κ6〃46％プ∂」4σ（ガyJσ

3， Gnathopod1，五nger in male evenly c皿ved＿，＿．五づ％％o〃4 0hμた6雑ε’ε

L昭●6わ079彪ブ砂o％加，sp． nOV。（Figs．11，12）

ル勧爾π1θ耀痂泥4：Areas IV（1），IX－b（1），X（16），XI－a（33），XI－b（1），X皿一a （2）。Tota1：54specimens，3。5－10．Ommlongl2－53mindepth． 1）os6プゆガo％： Pleon segments l an（1 2 each produced to three 哉（lpresse（1 dorsal teeth，the mid（lle one largest．Pleon segments4and5each with a small thooth，that of pleon segment5very small and often evanescent． Pleon segment6with one pair of dorso－lateral spine．Lateral lobes of head somewhat narrowly pro（iuced，its apex subacute．Eyes an（i antemae like in L。勿ll躍σfigured by SARs（1895，pl．187）．Coxae1－3each with a minute tooth at the lower hin（l comer；coxa4with2－4minute teeth on the hin（1margin； the anterior Iower margin of coxae2－4an（i the lower hin（i comer of coxae 5－6also each with a minute notch or tooth l all the tooth or notch usua11y accompanie（1by a minute seta．Thir（l pleonal epimeron with a small sinus above the lower hin（i com6r tooth． The imer plate of maxilla l with one or two setae，the secon（l article of 0伽彫傭伽％且卿吻04α6μhoSθオ01％1伽4Sθσ，1 「161

maxillipe（1al palp relatively elongate，outherwise the oral parts nearly like in SARs’丘gures of L．卯〃づ4σ．Gnathopo（i1：article2proximally wi（ier；article 610ng an（l slender，more than twice as Iong as broa（i；the palm，along the most outsi（le e（1ge，with a row of spinules hooking at the tip l the me（iian side bearing the e（lge line（l with spine－like setae armed with2minute ac－ cessory teeth at the mid（lle；article7with the inner edge entirely smooth． Gnathopod2：the palm roughly dentate near the hinge of the丘nger；the palm in male Iined with many long setae throughout the margin l finger with

1 ● ざ 2

』、

㌃’ 1’ グ、

義

5卿

Fig，11。 L〃ノθみ07g臨ブ砂o漉oσ，sp，nov，＝1，1ateral view l 2，upper view of（10rsal teeth on負rst pleon segment l3，10wer hind comer of third pleonal epimeron；4，male third uropod；5，telson．

5－8flattene（i teeth on the proximal half．Peraeopods l and2very slen（1er an（i（ielicate，且nger more than one half the Iength of article6．Peraeopod 5：article2（iistally narrow l article5subequal to or shorter than article4・ in male the article5rather Ionger；nnger normally longer than article6，but often broken off．Uropod3＝imer ramus longer than the outer，in male much wider than in female．Telson more than twice as long as broa（i，the apices bi（ientate，the outer point much longer thall the inner，each of the notches with a strong spine．Color tinte（l with pale pink，particularly on peraeon segments2－4and pleon segments1－3． 162 K．NAGATA

◎ 0

／ M N F ＼

＼

N 譲い 1・！ちロ E H 匙いロ

k、

＼ P △ J

1 1 選・・．

Fig．12． L幻θわoプg如ブ砂o耽σ，sp．nov．Male，8mm：A，hea（1and pedmcular articles of antennae；B，dorsal teeth of pleon segment l from upper view l C，Iateral view of pleon segments4－6and telson l D，third pleonal epimeron l E，Mandible l F， maximped；G，gnathopo（11，with palmar armature magnified；H，gnathopod2；1， J，K，L，M，peraeopods1，2，3，4，5；N，uropod3；P，telson． Female，ovig．， 7mm：0，uropod3。G－M3the same proportion of magni五cation． Gσ吻甥σγづ46σ1z！1”2カhづカ04σo∫’h6 S認0 1％1α，z4Sθα，1 163

∬oloウμ：KN No。3104，male，8。8mm．乃ヵ610041勿：St．7量n Area XI－a， 47－51m，sandy mud，June13，1959・ 1～卿σ娩3：The new species is in general appearance too much closely relate（1to L．翻罐oo7初s which is丘gure（1by SARs for L．鋼〃ゼ伽，except for the （10rsal dentatiQn；each of pleon segments l an（12in the latter has only a （10rsal tooth．In（liscussing L．α即％α扉」づs which is also much closely allie（1to L．δ紹擁oo吻づs，STEBBING says on the value for specific（1istinction attribute（l to the di丘erence of dorsal dentation，“the question exercise（1a soporific influence on my mind・・（1910，p・588）・This question has also much amoyed me for a long time in i（lentifying the present Japanese form・ If this Japanese form was not（iesigna重ed as a new species，it woul（1have been assigne〔i to any of the known ones having a close resemblance to L． δ名ω∫oo7擁s： L． 4θσ％‘z扉」づ5 STEBBING， L．カ70短卿α CHEvREux， L， oo♂046蛎σ如 ScHELLENBERG，and L．ゐ柳づoo擁3（BRuzELlus）．L．oo≠04傭4躍is found from the neighboring waters of Falkland Is・，and it is geographically far distant from Japan．五．proxima i（1entified by ScHELLENBERG（1938・P・31・五9・15）from Marshall Is．shows a afairly（1ivergence from a typical form ofρ名o短灘desig・ nated as a new one by CHEvREux（1907，P・475，figs・4－5）from Gambier Alchi－ pelago，South Pacific・ K・H・BARNARD suggests in his paper of1916（P・167） that his South African specimen referred to L・加o短解σmay possibly be a syn・nym・fL・卿％4灘s・ In my specimens，gnathopo（i2is never excavated on the palm unlike in L。469紹b21∫s（STEBBING1910，P・5581K H・BARNARD1930・P・3641HuRLEY1954， P．786）．CH・LT・N’smaterialreferredt・Lわ艦・緬fr・mS・uthAustralia （Bass Strait）（CHILToN1921・P・64）is undoubte（11y the same species as L・ αθ9襯扉露s by STEBBING・PIRLoT’s specimens ofα69郷δi傭from Sulu Sea・Philip－ pines（P・RL・T19362P・301）bearf・ursetae・ntheinnerplate・fmaxilla1・ an（1show a consi（1erable difference from the typical form ofσ⑳鰯δ薦3・It is strange that Australian磁9瑠6薦s by STEBBING an（1CHILToN is somewhat （1ifferent from New Zealan（10ne by K H・BARNARD an（1HuRLEY・The（iorsal teeth is absent in the former，whereas，in the latter K・R・BARNARD（iiscems three minute denticles only on pleon segments l an42・and in HuRLEY materials it is arrange（i as3，3，0，1，1in order of pleon segments1－5・As far as the arrangement of（10rsal teeth is conceme（1，the present new one is certainly allied to L．σθg襯扉」∫s（iescribe（1by HuRLEY． After a long Period of consideration about a question which amoyed me much，1ma（le up my mind to accept the importance of the specific value of dorsal dentation for avoiding a confusion in the i（ientification of the species in this genus． ScHELLENBERG says in his paper of1931（p。129，as to L oo∫046漉σ如），‘‘Die abweichende Bezahnung des I und II Metasomsegmentes kommt im Habitus 164 K．NAGATA

nicht zum Aus（iruck．Die dorsale Bezahnung ist schon bei（1em2．5mm langen Exemplar（leutlich ausgebildet．” In the materials at my han（1，the（10rsal dentation on pleon segments can be（1istinctly discemed even in small specimen of3．5in Iength．According to the pleonal tooth formulas given by J．L．BARNARD （1962，P．86，table1）to26species hitherto been reporte（1 0f the genus，the species bearing the arrangement of the dorsal teeth number as3，3，0，1，1 in order of pleon segments l to5，are limite（1to the following seven ones：

L。舟伽σh伽♂（BATE）1862 L．卿σo名040％ScHELLENBERG1931 L．σ6‘7z6σδJl♂εSTEBBING1888 、乙．Jo％9づoo7㎎づ3（ScHELLENBERG〉1931 五．彫伽♂σScHELLENBERG1925 L．σ肋70ガ肋HURLEY1954 L．oo！04θ％！σ如ScHELLENBERG1931

The present new one is distinguished from any of the above species by the following characters：The male gnathopo（12is（iensely lined along its palm by long setae；the inner edge of finger of gnathopo（11is entirely smooth in all of the specimens ranging from3．5to10。O mm in length l an（1peraeopod5 has much long丘nger．It shoul（1be note（1that the new species agrees with L．δσ7’h召卿♂HuRLEY（1954，P．798，Hgs．184－201）in having no teeth on the finger of gathopo（11，an（1agrees with L。別σo名o％舛（SARs）（SARs1895，pL188，fig．21 STEBBING1906，P．231）in having a long an（1 slen（ier finger of peraeopo（is l and2，and also with L．μo∬伽σCHEvREux（Lc、）in having a very long丘nger in peraeopo（i 5．

L吻Ooわ079彪s677伽，sp．nov．

（Fig．13）

Mlσ！6万α16耀吻％認：Areas IV（19），VI（5），XI－a（10），XI－b（2）．Total：36 specimens，4．2－13。Omm，from depths of5－53m。 pθs6吻≠吻：Pleon segments l an（12each with three a（1presse（1（iorsal teeth，the mi（1（11e one the largest・Pleon segments4and5（10rsally elivating an（1carinate，each pro（iuced to an acute tooth on the posterior end． pleon segment6with one pair of dorso－lateral spines，and the hin（1er en（1pro（iuce（i backwards to the rounding lateral lobes．Pleon segment3（10rsally unarmed， the epimeron with a tooth at the posteribr lower comer，sinuated above，the hin（l margin slightly convex．Coxae like in the prece（iing species，except that coxa7is Iine（i with many minute notches on the hin（l margin．Lateral lobes of head more broa（lly produce（l than in the preceding species，its apex roun（iing．The shape of eyes an（l anten旦ae like in the preceding one．The first article of mandibular palp rather longer than the secon（1；the outer lobes oHower lip with a minute spine at apex：the imer plate of maxilla l with one or two long setae；otherwise，the oral parts like in L．卿〃’4σfigure（l by SARS． θ4〃z〃z‘”ゴ46‘”z／1卿力乃4汐04σ o∫オh6 Sθオo 乃zlσ％4S6‘z，1 165

Gnathopod1，article6not so slender as that of the preceding spec圭es， article7with5且attene（1teeth．Gnathopod2wit込the palm o£article6finely dentate，lined with many blunt small denticles partly or through the length l Hnger with9teeth along the proximal two thir（1s；gnathopods1－20therwise like those of the prece（iing one． Peraeopo（1s 1－2also like in the prece（ling one． Peraeopods3an（14：article20blong oval，the hin（i margin nearly straight an（1（1istinctly serrate（i，the Iower edge of the hin（110be truncate（1；article4 the largest of the last four articles l五nger normal。Peraeopo（15：article2 more expande（1，rom（ling ov31，the hind margin deeply serrate，the lower e（lge truncate（i；article4subequal in lengt虹 to article5in female量in male article 5 rather longer than article4；Hnger stiliform，about five sixths as B ・駕 c H E F G D

Fig．13．〃加δ07g彪3θ7窺㍍，sp．nov，Female，o▽igりholo亡ype，13mm＝A，1ateral lobe of hea（1．Female，ovig．，10mm＝B，upper view of dorsal teeth on pleon segment 1；C，lateral view of pleon segments4－6，telson，and uropod3；D，third pleonal epimeron，with the comer magni五ed l E，mandibular palp；F，G，article20f peareopods3 an（15；H，telson。

Iong as article6（often broken off）．Uropo（i3ンinner ramus subequal in length to and，wider th盆n the outer．Telson，the apices with the inner point longer than the outer contrary to those ofぬe preceding species，each notch with two or three spines．Color re〔lish，particularly with transverse bands of（1eep red。 11ひlo砂ヵ6：KN No．3006，female，oving，，13．O mm。乃ヵθ♂ooσ1吻＝St．8in Area IV，20－25m，sandy mud，June15，1956。 1～伽σ娩s：The new species appears to show no prominent sexual differ・ ences，andisfairlyrelatedt・L．脚・名・4・フzScHELLENBERG（1931，P・133，Hg・71）・ which is foun〔1from the neighbouring waters of Magellan Strait，South America，but重shqredistinぢulshedfrQmthelatterbythefQII・wingdi貨erepces； 166 Kl．NAGATA

The oral parts in辮σ6zo40％are said to be similar to L、鋼〃∫磁，except for upper lip，but in my specimens the丘rst article of man（libular palp is usua11y broa（ier an（l longer than the second，an（l the outer lobes of lower lip has a minute spine at each apex，just as seen in that of Pσ賜4θ劣翻吻伽7nα剛herein described．The posterior en（i of pleon segment6in解昭o名040雇s acutiform． The apices of telson in耀407040％is contrary to t五〇se of t血e present new species，i．e．the outer point longer than the inner．As far as gnathopo（12 （1escribe（l and figure（1by ScHELLENBERG is concerne（1，the shape of article2 in”昭e7060n apPears to s｝low－a sexual（1ifference although there is a（lisparity in the size of the specimens，moreover，the armature of the palm and palmar angle are somewhat（iifferent in minor details；in the new one the palm 丘nely dentate，an（i the palmar angle has a short spine at the concavity and has long an（i short two spines at the median si（ie a little backwards l the shape of article60f gnathopo（1s l an（12also seems to somewhat differ from the new species． Peraeopo（1s3and4，the posterior edge of article2in the new one is not so deeply serrate as that of peraeopon5．The new species also somewhat （liffers from別σση40％both in the proportional lengths between article4and article50f peraeopo（i5，an（i in the length of finger of peraeopo（15。 Both species are，however，essentially very near to each other，an（l I am not quite certain whether the present new species is entirely（listinctive from 五．吻40名040％or not．But no specimens of五．卿40名040％have been fom（1from any other localities than Magellan sea－area，and so I would Iike to designate the Japanese specimens as a distinct species from the ScHELLENBERG7s species recorde（1in the locality far（1istant from Japan．

14％％6〃40h〃々6％s’3CHILTON

iす％％JJσσh〃々θπsおCHILToN1921a，P．525，fig。1．

ル観6万41θ耀吻％θゴ：Areas XI－a（3），XLb（1）15．6－5。9mm in length；from （1epths of10－53m． 2～翻α娩3：In the specimens at my hand，antenna l in female a little shorter than antema2，while in male antenna2much Ionger then antema1， about twice in length；pe（1uncular article l of antenna l in both sexes stouter an（1a little longer than article2；primary Hagellum of antema l in both sexes shorter than the peduncle．On the contrary，CHILToN’s specimens have the first antenna in male longer than the second，an（1have the peduncular article20f antenna l in female longer than article1．Telson in my speci－ mens more longer，about2．5times as long as broa（i．Otherwise，the present ones appear to agree quite well with his ones，particularly with the charac－ teristic feat耳re Qf飢ale gnathopo（11，an（1therefQre I cQμ1“PQt CQ増si（旦Qr thQsす 0σ卿彫σ7づ4θσ％．！1ηz力乃づカ04σ o∫’h6 S6’〇五％」‘z％4S64，1 167 specimens to be entirely distinctive from五Chづ」々6％3づs。However，it is strange that C田LToN’s specimens is contrary to the present ones in regarding to the relative lengths between the first an（1second antemae in male。 Dゼ3ず7狛％あo鋸： Chilka Lake，India，

14観θ〃σo％漉4σo≠吻，sp。nov。

（Fig．14〉

O A L M 撃・ B N・〃 F轟 Q

1 貰 H 〆〆 J

Fig．14。五4吻θ〃46％7擁磁c妙㍍，sp．nov。 Female，5mm：A，hea（1and antemae l B， mandible；C，（1istal half of right man（1ible magni丘ed；D，E，maxillae1，21F， maxi玉1ipe（11G，H，gnathopods 1，21J，K，L，M，N，peraeopo（1s 1・2・3・4・5；0・ pleon segment3；P，uropod3；R，telson；Sン（10rsal denticles of pleon segment 2from upper view．Male，6mm：1，gnaもhopod1；Q，uropod3。

砿伽吻l o耀郷吻4：Areas I（5），X（1），XI－a（14）l up to6．3mm in length， from depths of15－56m p630吻≠加：Pleon segments2－4more or less minutely serrate on the postero（lorsal e（ige respectively． Each of coxae1－3with a small tooth at the Iower posterior comer．The thir（1pleonal epimeron arme（1with a small tooth at the lower posterior comer，forming a small sinus above；the slightly convex posterior edge minutely se皿ate along the half below．Eyes oval， 168 K。NAGATA

narrowing below（my（irawing in the五gure is poor）．Antenna l subequal in length to antenna2，pe（luncular article l slightly longer than article2，article3 very short，accessory flagellum2－jointed．Antenna2with peduncular article5 shorter than article4．The above characters of antennae nearly similar in both sexes。Mandibular palp fu11y elongate，geniculated between articles l an（121article l relatively long，nearly as long as article3． Inner plater of maxilla l with two setae、Gnathopo（11in male more powerful than in female， an（1much larger than gnathopod2；in female nearly like in the prece（1ing species，but in male the palm sharply tumed at the mi（1dle，1ined with a row of short spines，and bearing an acute tooth near the finger hinge，Hnger strongly developed，abruptly an（i right－angularly curve（L Gnathopod2typical， similar in both sexes．Peraeopods3－5successively largerンtheir article2 rather slen（ler than the type，the posterior edge minutely serrate．Uropo（13 with inner ramus longer than the outer，particularly in male powerfulンmuch longer an（i broa（ier，t血e outer bearing the slen（1er secon（1article（or spine P）． Telson slender，more than twice as long as broad，the outer point of the bidentate apices longer than the inner，each notch arme（l with two long spines．飾Jo砂ヵ6：KN No．2978，male，6．3mm，from St．30f Area XI－a，40－45mン June 12，1959． R6吻σ娩s： Three species of this genus have h孟therto been in the world， i．e．五 αθ9協oo7擁s （SARs），五〇h〃たθアz3づ3 CHILToN，an〔i 五 Joπg伽osケお（CHEvREux）． The new species is obviously distinguished from the above－mentioned ones by the characteristic male gnathopo（11。

Family OEDICEROTIDAE

Kθツ ∫o オh6 3カ60ズ630ノ’0θ4Joθ露o蕗4σ8

1． Gnathopod2chelate ＿＿＿＿＿g＿＿＿．、＿＿＿，＿＿＿．色＿＿＿一＿＿＿po雇067切θ3σ」如吻α7伽％3 1． Gnathopo（12subchelate…響＿、＿…，＿＿…＿＿．・…。．……・…………．………9、、＿…・．9＿＿＿＿＿2 2 Gnathopod2，article5produce〔1into a long slender posterior lobe．・，ハ頻0％00π10463””Zπ0汐h”％3ノ‘％FOπど0％3 2 Gnathopod2，article 5not pro（luce（i圭nto such a lobe at a王1＿＿，．βσ！hツ卿040πJo％9’甥απ％s

Po吻07碗sσ〃α灘吻％s（BATE＆WEsTwooD）

Po撹oo7¢惚sσ」オσ卿σ7づ％螂，SARs 1895，P．695，supPL pL VII，fig．2；STEBBING1906．P．240， ScEELLENBERG1942，P．178，fig．1471NAGATA1960，P，170．pl．14，figs，37－45， Poπ！oo〆σ！θ3σ76％σ7伽3，CHEvREux＆FAGE1925，p、166，丘g．167。

ル観θ7飾J g耀吻紹4：Areas I（2），III 5），IV（108），VI（88），VII（132〉，IX－b（47）ン IX－c（10），IX一（1（17），X（48），XI－a（991 ，XI－b（163），XIII－b（22）． Total：1633 specimens，up to11．O mm in length l from（lepths of low－water marks in spring ti（ie to56m． θ4吻％zσグ∫464アz／1”¢カhづメ》04αo∫オho S6≠o Z％」σ％4Sθσン1 169

0魏励観oκ：European coasts（S．and N．coasts of Norway，Skagerrak， Kattegat，Dogger Bank，Netherlands，British Is．，Atlantic coasts of France）。

β4！h夕吻640躍lo％9初2σ％％3（BOECK）

Bσ∫1η彫640πJo％gJ卿σπz‘3，SARs1805，P．333，PL117；STEBBING1906，P・257；SHoEMAKER1930・ p．273，figs．24－25；GuRエANovA1951，p，552，fig。336，

砿σ’07伽J o紹耀％4：Areas XI－a（330），XI－c（16）；up to6。O mm。in length l from（1epths of30－56m， 1～獺α娩3：Comparing the specimens with SARs，丘gures，I can丘nd only the following minor（1ifferences：Coxa l with the Iower margin more rounde（1 as seen in SHoEMAKERs’s丘gure；antenna1，the丘rst pe（1uncular article slightly Ionger than article2；gnathopo（12，articles5an（16somewhat more slend．er； telson rather similar to the shape of SHoEMAKER’s one，the apex truncated， with two short spines an（1two long setae l peraeopo〔13with the article2 proximally more expan（1ed；article70f peraeopod5sometimes about as Iong as article 6． D魏励漉o％s：Franz Josef Lan（1，Barents Sea，Norwegian coastsンIcelan（i， W。of Greenland，Gulf of St．Lawrence，North Sea，and Japan Sea。

ハ40noo％Jo46s l’砂zκoρh〃％sゴαρoア露o％s，subsp・nov・

（Fig．15）

M伽7翅θ∬佛伽4：Area V，23specimens，up to5．4mm in length；2．9－ 3．7min（1epth． Pθ5。吻伽：Thespecimensaredivergentfr・mthetypedescribedby TATTERsALL（1922，p．440，pl．18，figs．10－20）in th“following respects：The second pleonal epimeron with the posterior lower comer not rounde（1，a little pr。ducedbackwards；themargin・fthethreepairs・ftheepimeralined with setae l the lower margin of the last two pairs of epimera not evenly roun（1e（1．Coxa20f equal breadth；coxa4with the lower hind comer more st金。nglypr・ducedbackwards．Thepenultimatearticle・fthepeduncule・f antenna2nearly equal to the ultimate in length，Artcle20f gnathopo（is 1－2an〔i peraeopod2not so slen（1er and longer。Article70f peraeopods1－2 extremelysmall，justasseeninth・se・fM。・α吻備，alm・stlessthanahalf the length of that丘gure（1by TATTERsALL throughout all of my specimens， while those of peraeopods3－4well develope（1，about two thir（ls as long as article6，bearing a nail－1ike cap at the distal end。Article20f peraeopod5 ne母rlyquadrate．Ur・P・ds1－2，theramialm・stequal・theinner・nlyslightly l。ngerthanthe・uter，and・nthec・ntrary，th・se・fur・P・d3withthe・ute「。nlyslightly1・ngerthantheimer・Tels・nslightlytaperingt・wardsthe 170 K．NAGATA

distal end which bears two long setae on the edge。These specimens， otherwise，hol（i fairly well for TATTERsALLys description an（i丘gures． E∂lo砂汐6：KN No．2430，female，5．4mm frQm the mouth of the River Ot＆， Oct．20，1956。 1～6郷σ娩3：The new subspecies could not be consi（1ere（1to be quitely dis－ tinctive species from Tattersa1Ps one because of the entire agreement of the stmcture of the丘rst and secon（i gnathopods，although his species was taken

響尼9、，潜

Fig．15， Moπoo麗Jo‘Jo3露卿％oρ海Jz‘sノαφo痂o銘3，subsp，nov。Female， holotype，5，4mm l A，plegnal epimera；B，coxa41C， distal en（10f peraeopo（14，with the apex of finger magnified；D，article20f peraeopod5；E，telson，with the apical edge magnified。

from the fresh waters of China，whereas this was procure（1from the brackish waters of the river．The new one has a certain coinci（ience both with砿sッー％oρ諺h41吻％3BuLYcHEvA（1952，p．209，Fig．11）and with M．鰯o伽σ砒3BuLYcHEvA （1952，p．211，Hg．12），each from the Russian si（1e of Japan Sea，but the for・ mer shows a（ii鉦erent structure of gnathopo（i2，the latter（iiffers in gnatho・ pod l from the present subspecies respectively．

（70δ660nガ％％66！） STUDIES ON MARINE GAMMARIDEAN AMP皿PODA OF THE SETO INLAND SEA． Il

KIz6NAGATA

Inland Sea Regional Fisheries Research Laboratory，Hliroshima

珊≠hl1丁副一万9耀s

CONTENTS PART L Systematic Account（continued） Systematics（With Figs。16－26） Synopiidae 171 Tironi（1ae＿匿＿．＿。，．，，＿＿＿．．．．＿ 171 Calliopiidae 174 Pleustidae＿，．．＿。．． 174 Atyli（1ae 178 MelphidipPidae 178 Pontogeneiidae 185

Family SYNOPIIDAE

S甥o吻9％1かσ郷σ7勉σDANA

Sツκoがαz‘」ケ4卿α7伽σ，STEBBING1906，P．271；ScHELLENBERG1926，P．341；K．H．BARNARD ］L930，P，367；PIRLoT1936，P．301。 Syno卿sohθθ」θ劒σ，STEBBエNG1888，p。799，p1．52；STEBBING1906，p．2721WALKER1909， P．332；REID1951，P。233・ S』yπoψ彪oガθπ∫4だs，STEBBING1906，p，273，

砿碗吻」6耀雁紹4：Area IX－d，84specimens，up to5．O mm in length； from many plankton collections at night， 0短励醜o％；A亡1antic（42。N to18。S），Re（1Sea，Indian Ocean（Amirante， and Carga（10s），East In（1ies seas，an（i Pacific（34。29／Nン138。34E）。

Family TIRONIDAE

Sク77ho舜631う40〃30％3，sp． nOV。

（Fig．16）

Publ．Seto Mar．Bio1．Lab．，X皿（3），171－186，1965．（Article9） 172 Kl．NAGATA

1レ勧6吻1砿翻吻4：Many specimens from the stomachs of benthos－feeding 丘shes caught exten（iing over Bungo Sui（i6an（l Tosa Bay，September1957to August1958，20－100min（1epth．Length：3．2－6．Omm． 1）630吻オ10％：Dorsally carinate，but not prominent throughout，posterior elevation usually raised from peraeon segment50r6（from the segment2 in a small specimen of3．2mm long，Hgured here）．Pleon segments4－6in male just Iike in S．s67吻α丘gured by SARs（1895，pL137）．Head l rostrum A

／

／ 1◎ 一一琶一噂E C ’＼、、無1◎ ＼

／多、！x

踊／

Fig・16・Sy77ho漉ε鋼σ麺傷ε，sp・nov・Female，holotype，6mm：A，head；B，maxilliped； C，D，gnathopo（11and its article6further enlarged；E，F，gnathopo（i2an（1its －article6magni丘e（i l G，coxa3，right；Hンperaeopod2；1，」，article20f peraeopods 3，4；K，peraeopod5；L，epimeral plate31M，uropods「1－3；N，telson．0，P，（10rsal profile of male，5，0mm and female，3．2mm respectively． strongly deHexed，exten（1ing to the en（i of the first pe（iuncular article of antema1，lateral lobes somewhat slightly angular．Peraeon segment2very short．Coxa l pro（1uce（i forwards below；coxa4comparatively broa（i，nearly as（ieep as coxa3．Thir（1pleonal epimeron with the hind comer produced to an acutely uptume（l tooth，the margin above evenly concaveンnot serrate． Antema l in female，the secon（l peduncular article nearly as long as the Hrst，about 1・5 times as long as the thir（1，flagellum shQrter than peduncle， S渉％4♂630％砿σ粥6％6 0σ％z卿σ7」46σ％且勿zカh霞り04σ o∫！h6 S6Jo i％」σ％4Sθo，11 173

accessory Hagellum2－jointe（11in male the五rst pe（luncular article about as long as the secon（1and thir（i combine（1，且agellum longer than peduncle，with 8joints，the first setose，as long as the following three articles combine（i， accessory Hagellum3－jointed，the first long，the third short．Antema2in female typical，flagellum7－jointed；in male the peduncular article5nearly 1．5times as long as the article4，flagellum much Ionger，丘1iform，nearly reaching to the end of the animaL Mandible：cutting edge conical，not dentate；article30f palp about as long as article1．Maxilla1：inner plate with8setae，outer with ll spines．Maxillipeds：outer plate fringed with11 モspine－like teeth；article40f palp relatively long。 Gnathopo（i1：article2（1istally wi（lening，article5rather broa（1，more than twice as Iong as article6，spinose on the hin（1margin，article6narrow， without a sharply（1istinctive palm，the hin（1margin with a strong spine at one third the length from the proximal en（1．Gnathopod2much slen（ler， article5extremely long，about three times as long as article6，0f which both margin nearly parallel all along in both sexes，the hin（1margin with a strong spine at one third the length from the proximal en（1．Peraeopods l an（12二 article 4 relatively long；article7 also Iong an（i slen（ler． Peraeopods 3－5： article2with the upper front comer a little carinate；article20f peraeopod， 5fully expande（1nearly to the roun（1ing form，the hin（1edge mlnutely ser－ rate（1，article4consi（1erably long．Uropod l much shorter than the others l uropo（i2reaching beyon（1the others，with outer ramus only slightly shorter than the imer；uropo（13relatively short，bearing the rami subequal in length； rami of uropo（1s273broa（Ily lanceolate；outer ramus of uropo〔13probably not 2－jointed． Telson nearly or quite reaching the en（i of uropo（1 3・cleft slightly beyon（l the center，apices subacute，minutely notched，each bearing one setule。 πolo砂ヵθ：KN No．3450，female，6。O mm，Bungo Suid6，Sept・23，1957・ 1～g脚娩3：Although all the specimens are taken only from the stomachs of fishes，their exoskeleton of cutin is well preserved，and fuIly of use for examination．The above－mentioned characters are，therefore，trustworthy for their taxonomical features．The new species has some remarkable coin・ ci（iences with S．卿sづ〃％s ENEQulsT（1949，p．338，figs，57－60）from Skagerrak，in the con（1itions of uropods，third pleonal epimeron，lateral lobes of head， slen（1er form of丘nger of peraeopods1－2，an（1gnathopods1－2y but the boun（1ary of both species is here（iefine（1by the following（1ifferences：In his specimens，（10rsal carinae more acutely arme（1，rostrum more sharply an（1 right－angularlyde且exed，thep・steri・redge・farticle2・fperae・P・ds3－5 more sharply serrate（iンwhile in the new species coxa l with the anterodistal comer strongly produce（1forwards，coxa4more broa（1er and deeperンnearly as long as coxa3ンgnathopo（11with article5comparatively long，peraeopo（1s 174 K。NAGATA

1－5with article4relatively long，article2Qf peraeopod5more rounding， an（i ma（iibular palp with articles l an（12relatively Iong，ratio of articles1， 2an（13as2：3：2．

Family CALLIOPIIDAE

Lの如吻ρho勿εκoびσ62641σ％4彪6（THOMSON）

Lゆ勘卿助o伽s％o御8～84♂4滋初θ，STEBBING1906，P．294；CHILToN1920（partンonly in New Zealan（1specimens），p，1，figs，1－5， Phθア％3απo砂αθ2召α」σπ4づσθTHoMsoN1879，P．239，P1．10－c，β9．2 （part，mixed with P召％o汐Joεσ 3伽osσ）。 P伽oがo召σ4θ房露s THoMsoN1880，P．3，P1．1ンfig，3．

ル観6吻16％伽吻4：Area IV（1），VII（2），XI－a（3）；2，8－4．O mm in length l from（1epths of Zo3≠6伽belt near low・water marks to49m． 1～6灘娩s：The specimens agree well with T豆oMsoN少s五gure for翫πoμo％ 4観1づs，an（1also with K．H．BARNARDys details an〔1figures given for some New Zealand specimens of五．％o槻θ～昭♂砺4吻collec亡ed by CHILToN（1932，p。162，五g． 95）。However，BARNARD（1i〔1not give any information conceming the oral parts of the specimens，therefore the charac亡ers have not been still known・ In the specimens at han（1ンthe oral parts are well allie（i with those of O解磁紹410昭4卿4翅（BoEcK）f｝gured by SHoEMAKER（1930，P．299，五gs，35－37）ンpar・ ticularly both with the shape of man（1ibular palp an（1with lower Iip bearing well developed inner lobes，CHILToN says in his paper of1920（1．c．），“a minute accessory flagellum present in Antarctic specimens but not in those from New Zealan（1”，an（1this fact is alsQ ma（1e no mention by BARNARD．Unfortunately， antennae and also uropo（13are missing on all of the specimens in the present collection，but it is pretty sure that the specimens at han（1are well referred to L。錫o∂σθ～241翻4伽（THoMsoN）．A new gems may be probably more suitable for this species，or at least the genus name of O名翻4名6σwou1（1be more pre－ ferable than Lθ汐如卿1りhoヵ％ε． 1）∫s≠励観o％：New Zealan（1（Dune（1in Earbour，Lyttelton，Akaroa，etc。）。

Family PLEUSTIDAE

Kθy オo ≠hθ εカθoゴθs o∫P163‘εガ4σθ

Rostmm strong，gnathopods1－2powerfu1．．＿．．＿．．．．．．．．．＿＿，．．P伽3’6ε力伽oψ砺 Rostrum not strong，gnathopo盗s1－2not powerfu1． P礎σが郷’θ3房o卿oづ4θ3

．P伽S渉63勿％0卿（KRφYER）

（Fig．17） S≠％4づθ30％Mα7吻z6 0σ％z鯵z‘z7づ46σ％ノ1”z汐hゼρ04α o．プ≠h召S6≠o 正％1σ，z6S6σ，11 175

PJ6麗s’eεカσπoμ％ε， SARs 1895，P．344，P1。121；STEBBING 1906，P．310；SHoEMAKER 1930， P．3091STEPHENsEN 1938a，P．2531STEPHENsEN1944a， P．4；STEPHENsEN 1944・b， P．841GuRJANovA1951，P．635，fig．433，P．637；DuNBAR1954，P。750。 PJθ％s∫θ3力伽oμα，SHoEMAKER1955，P，40，fig．14，a－b；NAGATA1960，P．170，pL14，figs・46－49・ PJθ％3陀s oα≠砂h7σo伽3，STEPHENsEN1938a，P。252，fig．281GuRJANovA1951，P．637，fig・434＆ P．638，fig．435；STEBBエNG1906，P、310。 P16％3’63伽盈〆o曜4劾3，STEBB王NG1906，P．311；STEPHENsEN l938a，P．252。

ら A

唖 C ・㊦

Fig，17．PJ6粥≠θ3勿πoがσ（KRφYER）．A71ateral view；B，gnathopo（1 2；C，uropod3；D，telson，

M厩6吻」6耀癬％θ4：Areas IV（126），VI（1），VII（3），IX－b（2）；up to13．O mm in length l foun（1in Zo吻郷belt near low water marks。 P魏励漉o昭：Known as a circumpolar arctic an（l subarctic species；in North Atlantic，southerly to the New Englan（1coast，and・to North Sea l in Pacific，through Alaska，Bering Sea，south to Japan Sea・In the shallow waters of the∫apanese coast，this species is found by me from Mutsu Bay・ to the west coast of Ky血sh食，particularly inhabits commonly in Zosずθ74belt・ 176 K．NAGATA

P召7砂加吻s6加3カoJ40s，sp。nov．

（Fig．18）

ル鰯θ吻」6耀別伽4：33specimens from the stomachs of benthos－feeding 丘shes taken extending over Bungo Suid6an（i Tosa Bay，Sept．1957to Aug． 1958，20－100min（iepth．Length：3．1－6．5mm． P630吻ずづo％＝Pleon segments l an（12each with a backwar（1pointing〔lorsal tooth．Thir（l pleonal epimeron with the hind margin slightly convex，and with the lower comer pro（1uced to a small tooth，minutely sinuate（1above． Eyes of moderate size，almost rounde（1．Coxae1－4as deep as those of P． σ∬伽z〃露，which is figure（1 by SARs for Rσ名冴”ψh甜ho6 4．（1895，P1．124，fig．1）， an（1their lower hin（1comer each with4－5microscopically minute denticles； A E

Bノ C

、ノ D

Fig。18。Pα’砂」θ麗εオ63厩％3ヵo躍63，sp．nov． Female，ovig．，holotype，6，5mm： A，dorsal pro五1e of pleon segments1－3，with third pleonal epimeron l B，C， gnathopoαs，1，2；D，（1istal portion of gnathopod2magnified；E，F，peraeopo（1s 2an（15，AII legs the same proportion・of enlargement．

coxa l very small，narrowing（iistally l coxa4fairly resembles that ofσs3翻漉3 in shape．Oral parts typical of the genus l mandible with molar small an（l simple，t血ir（i article of maxillipedal palp lacks（1istal process． Antennae appear to be comparatively short，though not well preserve（10n all of the specimens at hand．Gnathopo（1s1－2comparatively small and feeble l gnathopod2slightly larger than gnathopod1，0therwise both almost similar in shape to each other except for coxae l article5not produce（i to a narrow lobe，but triangular in shape l article6a l曇ttle wi（iening towar（ls the palm，which is evenly convex，bearing a small cusp at the mid（11eンand（1enne（1 by two groups of spines from the posterior margin，t㎏烈argin straight an（1 smooth，nearly as long as the palm、Peraeopo（1s1－5slender，articles6an（17 proportionally long． S∫％4づθs o％ル葱σ7∫雑6 0α吻別4グゼ4θα％ 14甥』りhJρ04σ o∫ずho Sθ∫0 1％」α％4Sθ4，11 177

丑oJo砂ヵ6：KN No．3472，female ovig。，6。5mm，Bungo Sui（16，Sept．23，1957． 1～6駕σ娩s：The new species falls undoubte（11y into the genus Pσ7砂」6％s≠6s accor（1ing to J．L．BARNARD’s revisional key （1960，P．39）． It resembles P．房o％3μ3（KRφYER）（SARs1895，pl．123，五g，1，as Pσ解規ヵh露hoθo．）in（10rsal arma－ ture，but is rather closely relate（1to P．σ33ゼ吻づ〃3（SARs）（1。c，）ンan（1to P・9名αo〃づs （BucEHoLz）（SARs1895，pL124，fig。2，as Pσ解魏力h露hoθ加2擁co7％is）in the other characters．Differing frQmσs3伽薦3in the third pleonal epimeron，in the form of article50f gnathopods1－2，in the shape of coxa1，in semewhat smaller eyes，in relatively longer articles 6－7 0f peraeopo（is 1－5，an（1in the（iorsal appearance；from g名αo♂1づs in the depths of coxae1－4in comparing to the corresponding Peraeon segment，in having no projecting Posterior lobes of article 5 0f gnathopo（is 1－2，and in the dorsal apPearance． In P。σ33吻z〃4s， article60f gnathopo（is has the palm shorter than the hind margin，therefore more slender than in the new species，whereas in P．g名σ041Js it is similar in shape to that of the new one．

／ン・、

．．／．／／／へ，／

D C

Fig．19。 z4砂」％sブ4ψo，z伽‘εNAGATA。 A，lateral view；B，C，gnathopods 1，21D，uropod3， 178 K．NAGATA

Family ATYLmAE

ノ1砂伽sノσρo痂6％3NAGATA

（Fig．19）

盈ナフ1κ3／4卿廊露3NAGATA1961，p．216，figs，1－2．

ル観6吻’θ耀駕吻4：Areas IV（1），VI（1）；2female specimens，3．5an（1 9。O mm in length；from depths of3－10m．ヱ）づ3’励痂o％：Known only from Japan；it is foun（1by me from Tomioka Bay，the west coast of Ky血sh盒，after my paper of19610n this species was published．

Family MELPHIDIPPIDAE

Kθ‘ソ ∫o ≠hθ 31》θo∫θs oノハ拓6」ρh∫4づρφ」446

1．Telson emarginate，not cleft．＿＿＿。＿，ハ盈gJメ》hづε‘Zπσ ノのり0π歪αZ 2。 Telson （1eeply cleft，．．．2 2．Telson very narrow，nearly thrice as long as broad＿＿ハ拓gJρh歪44ψ‘z ゐ07θ‘zJづ3 2。Telson moderate，nearly twice as long as broad＿ 3 3．Thir（1pleonal epimeron with lower hind comer produced into a large tooth。．＿。．。砿θ」カh∫4」ρφg〃σs∫％襯♂4 3．Third pleonal epimeron with hin（110wer comer not pro（1uce（1 intoalargetooth・◎の，＿＿．＿＿。ハ拓θ」ψh∫4ガゑφ48Joゐ03σ

M61カh耐ゆφσ60764」づ3BOECK

（Fig．20）

Mθゆゐ毎ゆψ4わ07θ4」∫s，SARs1895，P。486，P1．170，fig・2；STEBBING1906，P・336；GuRJANovA 1951，p．696，丘g，481，

、／1

Fig．20。ハ拓θゆh耐ゆφσみ076σあ3BQEcK． Female，3．8mm：articles5－7 0f gnathopod2．

ハ44≠θ〆」召1 6σ躍”¢∫駕召4： Area XI－a，11specimens，3．5－4．2mm in Iength｝from depths of32－53m． S∫z‘4」θ30％ハ4iσプ∫κθ （穿4〃z吻σ7づ4θσ％且鯵zρhづカ04σ oノ∫hθS9≠o 正％1召”4Sθσ，11 179

1～6脚7々3：The specimens are all not goo（i for full obsefvation，nearly all of the appendages mutilate（1；both antemae，all of peraeopods，an（l uropo（1 3are entirely missing on all of the specimens。In spite of it，these specimens appear to be referable to the present species without hesitation by the dorsal apPearance，the thir（1pleonal epimeron，the shape of telson，the small eyes，the broadly roun（1ing lateral lobes of hea（i，and gnathopod1．They are well allie（i to those of SARs’figures for this species． Gnathopod2is somewhat different from that of SARs’one；the articles5 and6in my specimens are a little more elongate an（1slen（1er than in SARs’ one，as seen in the丘gure inserte（1here。However，it（10es not appear to be the discrepancy such as to be（iistinctive my specimens from this BoEcK’s species． 1）づs’励鰯o％：From the whole coast of Norway，54－260m．

M61φh14」カプ》σ8！oδ03α，sp。nov．

（Figs．21－22）

砿碗6吻16耀σ癬％64：Areas XI－a（45），XI－b（9）l up to6．5mm in lengthl from depths of32－56m。 1）630吻！加o∫ル脚1θ：Each posterior margin of pleon segments1－3pro－ duced to a mediodorsal tooth，with one pair of latero－dorsal teeth on either si（1e of it，showing no denticulation between them；the lateral teeth on pleon segment l very weak。Pleon serments4an（15each with a spiniform me（iio－ dorsal projection flanked more or less with minute（1enticles。Pleonal epimera 1－3with the lower posterior comer bearing no（listinctive projection，the hin（1 margin of the two posterior epimera much minutely serrate，Eyes not very large，but well develope〔1，hemispherically projecting・Head not short，lateral lobes of head with the rounding apex．Coxa l triangularly pro（1uced at the antero一（1istal comer．The thir（l article of man（iibular palp about two thir（1s as long as the secon（1；maxillipe（1al palp somewhat elongate，the fourth article with a slen（1er nai1．Antema l in female，4．O mm long specimenンthe only representation on all the specimens at han（1，about as long as the hea（1 to pleon segment l combined・Hagellum17－jointed・accessory flagellum4－ jointed，peduncular articles given here may be more broadly figured than in the actual one on account of being （iepresse（i by cover－glass，but the pro－ portions of length between them are fully appreciable，an（1somewhat similar to those of M．δo名詔1♂s figure（1by SARs． Gnathopo（1s l an（12not（1ensely setose than in three Norwegian species．Gnathopod1：article51ess expan（1e（1 than in ハ4．go6s♂（SARs 1895ンPL169），article6not greatly constricte（l at the base，palm not（iistinctly（1e且ned。Gnathopod21article5subtriangularly in form，somewhat resembles that of M。60名召観s，but much broa（1er an（110nger 180 Kl．NAGATA

than article6，which is oblong oval，having the palm not de丘ne（1、Peraeopods l an（1 2； article 5relatively shorter an（1 article 6 consi（1erably Ionger in comparison with those of the Norwegian species，article7bearing no setae on both margins．Peraeopods3and4：articles6－7each considerably longer， Finger of gnathopo（is and peraeopo（ls all long and slen（ler，with a slender nail．Telson nearly twice as long as broad，cleft extending a little beyon（1 the mi（1（lle，apices unequally bidentate，the notch each with one pair of long an（1short spines，an（i having also a long seta（？）on each outer si（1e close to the apex．Ante皿a2，peraeopo（15，and uropo（1s1－3are missing or mutilated

A B

」、、＠

C ＼ノ D 冥／

1 ググ

Fig。21．Mi6ゆh鰯ρ卯gJo60sα，sp，nov． Female，5．2mm：A，head l D，telsoa；E，apex of telson magniHed．Female，4．O mm B，antenna1，left l Cンperaeopod2，with nail of盒nger magni且ed。 in all of the specimens at hand．The specimens are probably all female． πolo妙ヵθ：KN No。2243，female，ovig．，5．5mm．T”θJooσ」吻：St．11in Area XI－a，47－53m，June15，1959． 1～6耀沈s：As is seen in M吻h競ρ卯σ％如7魏oσScHELLENBERG，eyes of my specimens is similar in structure to that of the genus ハ46」汐h躍ゆφθ〃σ，but otherwise the new species has many characters fitting to this genus．There have hitherto been known6species in the wor1（1；M．goθ3ぢSTEBBING，M． 60名oσ」ゼ3BoEcK，M．解σ07％郷SARs，M．s67辮！σ（STEBBING）シM．σn如πあoαScHELLEN－ BERG，and1匠・別σoγ％70躍63GuRJANovA。The new one is（1istinguishe（i obviously S’z64彪3 0曜ハ44グづ％s O‘z％zηzα7づ46‘z％！1％zρhゼ2う04σ oノ≠hθ S6≠o 乃zl‘z％4Sθ‘z，11 181 from any of them by the combination of t血e following characters：the stmc－ ture of eyes，the（10rsal armatureンthe thir（1pleonal epimeron，gnathopo（12， all fingers of gnathopods an〔1 peraeopods，telson，and proportional lengths between articles in each of peraeopo（1s1－5．

E B

グ

｛

／／ A

D N

Fig．22．砿6ゆh躍ゆ塑gJoゐ034，sp．nov。Female，ovig。，holotype，5，5mm：A，B，gnathopods 1，2． Female，ovig．，5。5mm：C，peraeopod3． Female ovig．，4。2mm：D，peraeopod 4，articles6and7．Female，5・8mm：E・dorsal pro丘1e an（1epimera of pleon segments・

M吻hJ4吻6〃α伽鰯σ，sp．nov・

（Figs．23－24）

瓢伽吻」6羅吻％64：Areas XI－a（2），XI－b（8）；up to4．9mm in length l from depths of32－56m。 pθ507ゆガo％：Pleon segmepts1－3each dorsally bearing a medial spiniform tooth，Hnely serrate on either si（1e of it l pleon segments4and．5each pro－ duce（1to a long Prominent medial tooth，more or Iess（1enticulated on both sides of it．The（10rsal appearance is fairly slmilar to that of Miθ1ρh♂4ゆ卯 182 K．NAGATA

灘o鰯錫（SARs1895，p1．170，Hg．1）．Pleonal epimera1－3each with a tooth a亡 the lower posterior comer，the hind margin of the last pair narrowly and prominently convex．Head short，eyes large，semiglobose，1ateral lobes with a small acute point l they are just like in Ml61ρhづ4ゆヵθ〃σ郷σ07％郷（SARs1895，pL 171）． Coxa l fully produced at the antero（1istal corner，coxa2not pro（1uce（1 （iownwar（1s behind．Antenna1，peduncular articles in male short an（1stout， article l of primary flagellum much elongate，somewhat laminar，10nger than the pe（luncle，accessory且agellum3－jointe（1，delicate and feeble．Antenna l of female and antenna20f both sexes are missing on all of the specimens

Fig．23．Mθゆ扉4ゆゆθ〃σ3伽鰯オσ，sp．nov．Male，holotype，42mm：A，dorsal profile of pleon segments1－61B，end of maxillipedal palp． Female，ovig。，4，9mm： C，mandibualr palp l F，telson．Male，4，0mm：D，antenna1，right from medial view；E，pleonal epimera1－3，

at han（1．Third article of man（1ibular palp as long as the second；fourth article of maxillipe（1al palp with a long an（1slender naiL Gnathopo（1s l an（1 2not（1ensely setose；gnathopo（11，article5moderately expan（1e（1proximally， narrowing（1istally，article6much shorter an（1smaller than article5，bearing 4－5slen（1er spines on the middle of the posterior edge，palm ill・（1e丘ne（1，丘nger long an（1slen（1er，bearing a long nai1，the inner e（1ge with5－6spinules； gnathopod2，in female resembles that ofル正。耀07％グ4，but in male shows no （1istinctive palm，an（1finger long an〔1slen（1er，bearing a nai1，palm in female with2－3rows of spine－group，a nail presents also in female．Telson cleft S’z64勿s o％ハ4冴〆♂％3 0召卿吻θ〆づ464％ノ1卿1ウhづρ044 0Lブ’ho S6’〇五％’4％‘！S64，11 183 to the half，inner e（1ge of each Iobe with a small point at a（1istance of the apical end，and armed with one long and one short spines。 Holo砂ヵ6：KN No．3157，male，4．2mm．Tッヵθ！ooσ」吻：St．6in Area XI－a， 32－56m in depth，sandy mud，June13，1959． 1～佛α鴻s：The new species is referre（1to the genus1吻1汐h鰯鋤6〃σby the short hea（1，the structure of eyes，by having an acute point on lateral lobes of head，an（1by the short peduncle of antema1，but has also some important characters which have been use（1as generic distinction of the genus1吻1汐h歪一 4ゆ卿BoEcK from the genus砿oゆh薦帥θJJαSARs，that is，the comparatively long article30f mandibular palp，accessory flagellum well（1evelqpe（1，coxa l tri・

一F－甲 P ，－甲一， E

A C 〃

B ＼ D ／

Fig．24．盈ゆ砺4ゆ喫μ43伽郷如，sp．nov．Male，holotype，4．2mm：A，B，gnathopods 1，2． Female，ovig．，4．9mm：C，D，gnathopod2and inside view of the end， Male，4．O mm：E，coxa2，Ieft． angularly pro（1uce（1．The occurrence of the new species is certainly weaken－ ing the boundary line between the two genera．Only one species of砿卿σo吻耀 is known in the world．All of peraeopods an（1uropo（1s are missing or mutilate（i on all the specimens at han（i．

伽」カh歪3σ刀σノαρonJ6σ，sp．nov。

（Fig．25）

M伽吻」6辮雁％64：Areas IV（3），XI－a（2）シXI－b（1），up to4．5mm long，from depths of10－52m。 Pθsoγゆガo％： Pleon segments2an（i3each（10rsally tridentate，not serrated； 184 K：。NAGATA

pleon segments4an（15each dorsally elevate（1to a compressed carina，and posteriorly produced into an acute point directe（i backwards．The secon（1 an（1third pleonal epimera with the posterior Iower comer pro（iuced to an acute tooth，and the hind margin slightly convex，not serrate．Hea（1short， eyes large，semi・globose on lateral Iobes which terminate in an acute point， just as seen in！晩1ρh麟ρヵθ〃σ溺σ07鰯π．Coxa l slightly pro（iuce（1forwards． Antenna1：peduncle very short in femaleンrather resembles that of female

H 黙

F ，霧

1’一 1 K

∫

Fig・25．ル須6ゆh∫3伽σノαρo瑠64，sp．nov． Female，holotype，4。5mm：A，dorsal proHle of pleon segments2－6；B，Cンpeduncle of antenna1，an（i accessory flagellum magni丘ed l D，head from upper view l E，F，gnathopod l and its enαmagnifieα3G，H，gnath． opod2and inside view of its end magnifie（1：1，J，peraeopo（11 an（1its finger magnified l K，pleon segment31L，telson．

of M．わol4fig皿e（l by J．L．BARNARD（1962a，p．81，丘g．7），but the article l more stout an（i longer than articles2an（i3combined l accessory Hagellum forms a minute no（iule（iistinctly articulate（iンbearing two small apical setae．Thir（l article of mandibular palp very short as in Ml．601σl fourth article of maxi1－ 1ipe（ial palp with a long and slen（1er nail，inner e（1ge of outer plate of maxi1－ lipeds margined with short，stout spines（or teeth）．Gnathopod1：article5 mo〔1eratelyF expan（ied proximally，finger long and slenderンbearing a nail，and S’％4づθ30％砿σ擁犯6 θσ盟zηzσガづθσ駕！1”zカhづカ04α o∫’h6S6オ0 1％1σ％‘！S6σ，11 185 line〔l with6slender setules on the inner edge．Gnathopod2more longer an（1slender than gnathopod1，rather similar to that of砿吻h観汐汐θ〃σ耀o耀解； palm il1－define（1シbearing two groups of 2－4 spines夕finger short an（1stoutフ bearing a nailンan（1arme（1with8－9setules on the imer edge。Peraeopods l and2extremely slender an（1delicate，an（1fairly well resemble those of！砿。脚07％郷，but Hnger much short，with the apical end truncate（1，beari且g two small bristle．Uropo（ls l and21ike in M吻乃翻ηαわolσ．Telson emarginate7 not cleft，the emargination with one pair of short spinule on the imer e（ige。 ∬olo砂勿：KN No．3173，・female夕4、5mm。IT勉o lo侃競y二St．18in Area XI－b，5－52m，Sept．4，1960． R鰯σ娩ε：The new species is referred to t｝1e genus！吻1クhづ3翻4by the prominent feature of the uncleft telson，but has also many coincidences with ハ4i吻hぎ4ゆ汐θ〃σ耀07％紹（NoRMAN）．Differing from M61カh魏1zαδolσin the dorsal appearance of pleon segments，pleonal epimera2－3，the shape of coxa1， gnath・P・d2，perae・P・ds1－2，andhavinganacutep・intinthelatera11・bes of hea（1．」．L．BARNARD establishe〔i newly the genus！吻」ヵhづεα郷in his paper of1962a，in which he says，“fourth palp article of maxilliped short，stout7 not claw－like，bearing2apical setae・7，an（i this feature was（1escribe（1as one ・fdiagn・sticcharacters．lnmyspecimens，thef・urtharticle・fmaxillipedal palp has certainly a slender nail which is apt to be mistaken for two apicaI setae，and丘nger・fgnath・p・dsland2hasals・anail，thecharactersin gnathopo〔1s likewise seen in his figures． On the other hand，however，it is noteworthy that the finger of perae一。P。dsland2inmyspecimensindicatesthesamefeatureasinthef・urth article of maxillipedal palp of BARNARD’s丘gure．Marginal armature of outer plate of maxillipe（is in my specimens is also nearly alike to that ofルf6」一力h吻力6〃α脚・解α．Thespecimensathandareallfemale・andantenna2・ peraeopods3－5，and uropod3are missing in all of the specimens。

Family PONTOGENEIIDAE jpo卿09θ麗宛プ03かσ如GuRJANovA

（Fig。26）

Po撹ogo％毎70sかσ如GuRJANovA1951，P・719，fig・500；」・L・BARNARD1962aンP・81・ P・雇・9θ伽sp．，NAGATA1960，P、171，pL14，丘gs・50－53＆pl・15・丘gs・54－71・

ル勧07鰯θ耀吻％θ4：Areas II（1），IV（7331），V（27），VI（186），VII（13），IX－b （131），IX－c（1），IX一（1（21〉，XIII－a（3），XIII－b（6），XIV（2）． Tota1：7722specimens， up to8．Omm in length；from Zos≠θ昭belt near low－water marks to a（1epth of5m． R6脚廊：My specimens described as、Po吻9θ鰯αundet、sp・in my preced’ ing Paper were referred to the present species byP T・L・BARNARD（19627L c・〉・ 186 K。NAGATA

However，some questions seem to still remain in the following respects： In GuRJANovA，s specimens，hea（i is pretty long，as long as the first three peraeon segments combine（1，whereas in my specimens it is only as long as the first two combine（1；inner plate of the五rst maxilla has4setae in him，

懸＼、＼

／／／

B ・麟 C E

ク

Fig。26． Po卿09θ鰐宛70sか厩4GuRJANovA．A，1ateral view of male； B，accessory丘agellum of antenna l l C，gnathopod21D，uropod3 0f male；E，telson． whereas has6setae in me．It may be note（1that the specimens at my hand are also fairly well a11ie（i to P．σ76％7彪BuLYcHEvA（1952，p．222，丘g．22）． 1万εケあ躍づo多z； Bering Sea，Okhotsk Sea，Japan Sea（Russian si（1e coast）， an（1southern California．

（To be continue（1） STUDIES ON MARINE GAMMARIDEAN AMPHIPODA OF THE SETO INI。AND SEA．III KIz6NAGATA

Inland Sea Regional Fisheries Research Laboratory，1｛iroshima

四露h18 T6灘渉・ノ2g％70s

CONTENTS

PART I Systematic Account（continued）． Systematics（with Figs．27－43） Gammari（1ae＿。＿， 291 Dexaminidae．＿， 305 Talitridae。，．．，，， 306 Hyalidae 307 Aori（1ae 308 Photidae 310 313 Ampithoi（1ae．＿＿り 9 り Ischyroceridae ．．．．。 315 ひ o o ，， ■ ， Corophiidae 316 Podoceridae 322 Zoogeographical notes with Fig．44and Table1） 322

Family GAMMARIDAE

Kθ‘ソ≠o ≠hθsカθo勿εo∫G‘”％砂2α7づ4‘zθ

1．Uropod3》rami very unequa1 ＿＿＿．、＿陰．＿＿＿＿．＿＿g＿＿＿．＿＿＿．＿＿＿＿＿＿，＿ 2 19 Uropod3，rami not very unequa1 一……・…一…＿……＿g，＿＿・＿＿……．＿＿＿＿＿D・＿。＿ 7 2 Bo（1y（10rsally more or less spinous or〔lentate＿＿＿＿．＿＿＿＿＿＿．、。．＿＿＿＿，＿＿． 3 2。Body dorsally smooth＿＿＿＿＿，＿＿＿＿＿＿＿．＿＿．＿＿＿＿■＿＿＿＿＿＿。＿＿＿ 6 3．Body with groups of dorsal spinules on all of pleon segments 且勉SO9σ卿郷σ7％3（E，）α露麗σ％4σ」6」 3．Body without groups of dorsal spinules on all of pleon segments．＿＿＿＿＿、＿＿＿＿ 4 4．Body without a median dorsal tooth on aII of pleon segments＿＿＿＿＿砿θ」伽々07θσπσ 4。Bo（1y with a median（10rsal tooth on some of pleon segments………一…・一一・……・5 5．Pleon segments1－4each with a median（10rsal tooth，flanke（1with some minute teeth on either side ．．．．．＿．．＿。＿。＿。＿，＿，＿。＿。＿。．．．．＿。＿。＿＿．＿，＿．＿．．，。．．＿ハ拓召」〃σ46銘がo％」4如 5．Pleon segmen亡s1－3ea6h with only a median dorsal tooth一・一………1惚」吻渉％δθ7伽鰯σ 5．Pleon segments2－4each with only＆median（10rsal tooth……g一一……Mθ」伽ノのo擁c¢ 6． Gnathopo（ls1－2，article6similar in shape …一……………・………E7Joμ36〃4sθohθ〃θκ舘3 6．Gnathopods1－2，article6dissimilar in shape ＿＿＿ひ＿＿＿＿＿．＿．．＿E短oがs4θJongσ如 pub1，SqtQ Mar，BiQl，LabワXIII（4）7291－326ン1965・（Article16） 292 K．NAGATA

7． Body dorsally quite smoot血伽67σ5召プ艇脚1耀 7．Bo〔1y（10rsally more or less dentate 8 8、Uropod3，rami oblong ova1，roun（1ed at apex＿．．．＿孤89吻70卿εσ4づε 8． Uropod3，rami not oval，not rounde（1at apex 9 9，Thir（1pleonal epimeron with hind margin serrate Cθ74400％s（Z）．）吻6競s 9．Third pleonal epimeron with hind margin not serrate 漁670〃σずθ％吻σ照

z4n才so9α甥卿召矧3（Eo9σ窺卿α郷s）α解碗磁lo’（TATTERSALL）

04卿卿σ耀3σ耀翻‘」α」6∫TATTERsALL1922，P．445，pl．20，丘gs．1－18；UENo1933，P。111；UENo 1935，p。90，92． ∠4初so9α魏卿47％3（E。）σ％η4難4σ」6づ，ScHELLENBERG1937，P。274；STEPHENsEN1944，P。52，fig・13．

Mσ渉67観6耀吻駕4：Areas IV（2at St．14，see NAGATA1960，丘g．2），V（1）， IX一（1（1）；up to ca．20mm long；in Areas IV an（i V，from a depth of2m in high water at the mouth of river；in Area IX一（i，from the surface water at night，2－3m in depth in high water． P魏γ伽ガo％：Known only from fresh water in the past recor（is l Southern Kuril Is．，Southem Sachalin，Japan（Hokkai（i6to Lake Biwa），an（1China （Eastem China and Yunnan）．Rere，the丘rst record from brackish waters， the mouth of river（it is noted that the species is foun（i from the surface water in high water of Area IX一（1，which is not just near the mouth of river but there is only a little inflow of the drainage）。

ハ48〃如海076α％αSTEPHENSEN

ハ拓9万勿彦o〆94η4STEPHENsEN1944，p．39，figs．6・一8，砿θ」甜σ7ソo％9BuLYcHEvA1955，P．201，fig．5，？Mθ」露σoo70％伽露，STEBBING1906，P．424；CHEvREux＆FAGE1925，P．229，figs．238，240。

ル観召7翻6耀吻％4：Areas I（2），V（30），TI（13），VII（17），IX－a（18），IX－b（1）， IX一（1（8），XII（3），XIV（11）．Tota1：103specimens，up to12．7mm in length l from interti（ial to a depth of1．5m in Iow・water． R6脚7々3：The specimens somewhat differ from STEpHENsEN’s（iescription and figures in the following respects：Pleon segment5is arme（l with a latero一（iorsal tooth and2－3spines on each side．The teeth are much minute in com－ paratively small specimens，an（l are often apt to be overlooke（1（STEpHENsEN must have lost sight of this fact）。This dorsal armature of my specimens agrees with that ofル正oo70％伽露H肌LER from the coast of Me（literranean． The lower posterior comer of this thir（1pleonal epimeron entirely agrees with that of砿．oo70nづ麟丘gure（1by CHEvREux＆FAGE。The comer appears to be somewhat variable in shape，and to be of no speci丘c value．The sub－ rectangular form of the comer（1escribed by STEpHENsEN is sQmetilnes also Seeロin my ColleCtio耳s， 04得z％zσ7づ46α％ノ1”zカhづカ044 0．プオh6 Sθ渉0 1％1σ％4S6σ，111 293

Male gnathopo（11，particularly in the distal en（10f the legs，agrees well with CHEvREux＆FAGE’s（1escription an（1figure forルf．oo70錫∫競。The finger 丘gured by STEPHENsEN is probably not actually the true one but it is the recurve（l antero一（listal process of article6，an（i the genuine Hnger is fo1（1ing down on the inner si〔1e of the palm．Such a false appearance as Hgure（1by STEpHENsEN is also often seen in the present specimens．Therefore，」．L BARNARD’s key by which砿．海076翻σis separate（l from Ml．oo70擁競should be revise（1（J．L．BARNARD1962a，P．108〉。 Otherwise，My specimens quite agree with STEpHENsEN’s one，砿6」吻ゑ07θ砺σis known by STEpHENsEN from Makinoshima，Fuzan，Korea，an（l my specimens referre（1to this species are also foun（i by me from the west coast of Ky血sh血．Therefore，it is almost incredible that the present specimens are wholly（1istinctive from Ml．々076伽αSTEpHENsEN。On the other hand，as seen in the above－mentioned consi（1eration，my specimens much resemble砿 oo70窺廟HELLER，and it seems to me that砿．為076σ郷may be a synonym of 砿．oo70％魏露．As a matter of fact，I am now unable to（iistinguish the former from the latter，except for female coxa6。In the former，female coxa6has the front lobe pro（luce（i to a recurve（1process，while in the latter the hooke（i process of coxa6has been describe（1neither in STEBBING’s monograph（1906， 1．c．）nor in CHEvREux＆FAGE’s one（1925，L c．），although it was unable to refer to HELLER’s original（1escription（1886）。It is now necessary to con丘rm whether M．oo名o％伽露is actually armed w豊th the hooke（1process on female coxa6。 I believe that Mθ1伽7ylo％θBuLYcHEvA from the Russian coast of Japan Sea is a synonym of M．たoグ6σ繊．The former is only a fully grown・up form of the latter．Dorsal armature on pleon segment5as mentione（1above is quite conformable between M’。7ソo％θand my specimens，an（l the presence of one pair of sub（10rsal tooth on pleon segments2an（i3begins to appear in about9－10mm long specimens in the Seto Inland Sea，an（1in much fully grown－up my specimens the teeth are also develope（l on pleon segment1， An evi（1ence of the continuity between々07％郷一form and7ylo％6・form may be prove（l by many facts that the both forms occurre（i together in a collection at a certain station，an（1 in fact I can fin（1no other qualitative（lifferences between砿．7ylo∂46an（1my specimens ofルf．海o名％郷，particularly in char－ acteristic features of male gnathopods l and2，and the hooke（1process of female coxa6． P醜7伽≠♂o％：Korea（Makinoshima）an（1Bay of the Great Peter．

ルf61伽4翻加1磁，sp．nov．

（Fig。27）

瀬σ’67彪1釧σ卿紹4；Areas IV（7）7VII（3）；up to4・5mIn in length7from 294 K．NAGATA

depthsof1－2minlow－water． P6so7吻蜘：Pleon segments1－4each with a large me（iiodorsal toothン flanked with some minute teeth on each side；pleon segment5with a latero－ dorsal tooth on each si（le，together with a spine at the same base；pleon

A C B

：K M ＼」 Q

N O L も

Fig．27．砿61」厩吻雇♂o％」σ如，sp．nov．Male，4．O mm：A，hea（i and antemae l B，acces、 sory flagellum of antenna l l C，dorsal profile o£pleon segments1－5；D，E，F， G，H，upper v圭ew of dorsal teeth of pleon segments1，2，3，4，51P．10wer hind comer of third pleonal epimeron l Q，uropod3・Ma王e・holotype・4・O mm＝1・J・ gnathopod l an（1the en（1magnifie（1；K7L，gnathopo（12and the end magnifie（1； 0，article20f peraeopod4，right、Female，ovig．，4。5mm：M，N，gnathopod2 and the en（1magni丘ed；R，telson・ segment61acks any tooth．Coxa l distally expanded，coxae1－3each with a small acute tooth at the lower hind comer．The thir（1pleonal epimeron with the posterior comer pro（iuce（1into an acute uptume（l tooth，minutely serrate（l above，Antennae comparatively short l antenna l much shorter tha取a half σ㈱灘磁6伽！1吻hゆ04αo∫渉h6S6Jo肋伽4S6σ，π1 295

the length of the bo（iy；peduncular article20f antenna l equal in length to article1；flagellum of antema l shorter than the peduncle，9－10jointed； accessory且agellum somewhat long，1－jointe（1；flagellum of antenna2with5－6 joints．Gnathopod l like figured here，similar in both sexes．Gnathopo（12， in male，article2stout，article6broad an（l tumi（1，the palm evenly roun（1e（1 exten（1ing over the en（i of the hind margin，un（1efined by any process，an（1 1ine（i with a row of short spines，the hin（i margin with some groups of setae，丘nger smooth，not acute at apex；in female，article2normal，article5rela－ tively longer，article6subtrapezoi（i the palm obliquely straight，unde丘ned by any distinct tooth。Telson simply arme（i as丘gure（1here，each lobe not acute at apex，with one short spine outsi（ie the apex，011e long spine insi（ie。 Otherwise，the new species nearly like in SARsつfigures for M．46漉σ臨（SARs 1896，pl．181，fig．1）． πoJo砂汐6：KN No。2925，male，4．O mm，TッヵθJooσ」吻：St。2in Area VII，4m in high－water，Jan．23，1957，mud．Zlos’卿belt，W，T，9．80C（bottom），CL18．16％o （bottom）． R卿σ娩3：The new species is closely relate（1to砿．4θ％鰯σ（KRφYER）（L c．） in general apPearance；the latter species has been recor（ie（i from Japan （？Japan Sea），accor（1ing to STEPHENsEN（1940aシP・309）・IwAsA has also inserte（1 the species as fomd near low－water marks into“lllustrate（l encyclope（1ia of the fauna of Japan”（press of1957）．The specimens at my・hand are all up to4．5mm in length，At least，I suspecte（1that the present specimens might be a juvenile form having a link with such an a（lult form as figure（i by SARs・ However，one female specimen at han（i is already ovigerous at4・5mm long， an（11can not，in the present stage of my work，believe the specimens to be i（1entical with M．惚％翅σby the following characters；that is，by having a prominent me（1ian dorsal tooth on each of pleon segments1－4，by lacking a media1（lorsal tooth on pleon segment5，by having no armature on pleon segment6，by having a serration on the posterior e（ige of the third pleonal epimeron，by having a comparatively short antennae，by being not pro（1uce（I to an acute tooth at the postantennal corner of hea（1，by having （1istally expan（ied coxa1，an（i by the form of male gnathopo（12． The new species marvelously resemblesハ4。1σ9％％60LlvEIRA from Rio de Janeiro（1953，P．316，figs。5－6）in male gnathopod2，but differs from the latter by the dorsal apPearance，an（1the structure of gnathopo（11。

ハ拓6露臨！z66670％14如，sp。nov．

（Figs．28－29）

ル勧副σ」θ∬徽伽4：Areas VII（1），X（1），XLa（15〉；up to9。O mm in length； from（1epths of7．5－56．Om。 296 K．NAGATA

P召so7ゆガ10％o！解σ」θ，8．O mm工ong：Body slender，pleon segment1，2，an（13 each with a me（iial dorsal tooth，pleon segment5with two small latero（10rsal teeth enclosing a spine on each si（1eシpleon segments4an（16having no dorsaI armature．Coxa l expan（1ed（1istally l the third pleonal epimeron with the hin（i lower comer pro（1uce（i to a short uptumed tooth，slightly serrate below， and the hin〔i edge bearing a long seta above the corner． Eyes（1ark，rounde（i oval，post－antennal comer（listinct but not acute．Antenna l reaching nearly the end of pleon segment31pe（luncular article2about1．5times as long as article1；article3shorter than one half the length of article l l flagellum 29－jointed；accessory flagellum with4joints plus l ru（1imentary one．Antenna

D 、・＼誌、A 、

孫 1 い’ F B ．’4 E ／、 C イ l〆’

＼、

、，拶一一櫛．／、6 〆〆〃〆 1、郷 H一峨で G

Fig．28．Ml6」伽劾δ67膨」4彪，sp．nov．Male，holotype，9．O mm l A，B，gnathopod 2an（i the palm enlarge（11D，gnathopod1。Female，ovig，，6．1mm l F，G， gnathopod2and its articles4－7magnified l H，（10rsal profile of pleon segments1－5，with the segment5magni丘e〔1・Maleン6・4mm：C，palm of gnathopod2；E，end of gnathopod 1。

2reaching slightly beyond the middle of且agellum of antennaエ1、l pe（iuncular article5slightly shorter than article4，somewhat narrower l flagellum a little shorter than article5，with ll loints．Gnathopo（11，anterior margin of article 2with a continuous groove through the length，（1istally d，ensely setose；article 5much longer than article6，bearing a small bump covere（1with many bristles（P〉at the antero一（iistal comer；article6proximally somewhat narrow， the palm transverse，short，an（1slightly convex，line（i with9setae on the かosterior half；finger short，abruptly narrowing to the apex．Gnathopod2 much Iarger than gnathopo（i1；article2with the anterior margin like in 0α吻吻αグ♂4θ‘z％且吻力hJカ04σoノ≠h6 Sθ≠0 1κ1σ7z4So‘z，111 297 gnathopo（111article5pro（iuce（1to an acute small tooth at the postero－distal comer；article6very large，fully elongate，the palm very oblique，1ined with several tubercles，each with a short spine，except for the one near the finger hinge which is larger，bearing3－4spines，un（1efine（1by a distinct angle；

1 0

D＿） E ～

ム

Fig．29。砿oJ伽劾δ召76％雄σ，sp。nov，Male，8mm l A，head and pedunCle of antennae， with accessory且agellum magnified l B・Cy D・E・F・peraeQpods1・2・3・4・51G・10wer posterior comer of pleonal epimera1－31H，uropod311，telson。 298 K．NAGATA

丘nger somewhat longer than palm，acute at apex．Gnathopods1－2rather more setiferous than in the prece（1ing species． Peraeopo（1s l an（12slen（ier an（1（1elicate，finger relatively Iong，about two thir（is as long as article6． Peraeopo（1s3－5，article2broa（11y ova1，minutely serrate along the hin（i margin，with the lower hind comer somewhat produce（1downwards，roun（1e〔1； peraeopods4and5nearly equal in Iength．Uropod3much elongate，outer ramus more than twice as long as the peduncle，the apex rather truncate，with 6－7unequal spines，inner ramus not twice as long as broad．Telson about 1．5times as long as broa（i，cleft nearly to the base，each lobe rather narrow， the apices with a small point，both margin of each lobe armed with2－3 small bundles of spine respectively．Color pale brown． Female（1iffers from male in gnathopo（i2；gnathopod2in female larger than gnathopo（11，but not so Iarger as male，article5relatively long，article 6with the palm not prominently tuberculate（1，more oblique，and evenly run－ ning into the hin（i margin。 Eol吻，6：KN No．2921，male，9。O mm．T”θlooσ」吻：St．7in Area XI－a， 47－51m，June13，1959，san（iy mud。 R卿α嬬s：The new species has no agreement with any species shown in “Pleonal tooth formulas of species in genus1吻」づ’α”by J。L BARNARD（1962a， p．107），an（1is easily distinguishe（1from any other species by the（iorsal apPearanceンgnathopo（1s1－2，pleonal epimera，an（1telson。

砿6」伽ブ砂o耽σ，sp。nov。

（Fig．30）

ル勧6吻1砿㈱吻4：Area VII，one male（8．O mm）and one female（7．O mm） specimens．Depth：2．5－3．O m in high water l near the low tide marks。 1）6soガ卿oπ：Pleon segments2，3，an（14each with a large me（lio・（iorsal tooth，pleon segment5with two small sub（iorsal teeth enclosing a spine on each si（1e，pleon segments l an（16without（10rsal armature。Coxa l scarcely expanded distally。Eyes roun（ied ovaL Antenna1，article30f peduncle much longer in comparison with that of砿46s砒hσ4α」。L BARNARD（1962a，p．110， Hg．22），about a half the length of article1，accessory且agellum with3－5joints。 Gnathopod l in male，article60blong oval，slightly longer than article5，palm evenly romded，line（1with spinules・un（lefined from the hin（1margin；the hin（1margin of articles4and6covere（i with a thick brush of short bristles， and also the antero・（1istal comer of article5armed with some serrate spine－ like setae broa（lene（1at the base an（i a small bump covered with many small bristles l丘nger sharply curve（1at the base．Gnathopo（11in female，article 6rather roundly ova1，slightly shorter than article5；Hnger norma1，some－ what shorter l otherwise nearly like in male．Gnathopo（12in male，article4 0α〃z盟zσ7づ4θα％！1”z1》hゴ1うo‘1σ oノ≠h6 Sθ’0 1％1σ％4Sθσ，1Z1 299

with the postero－distal corner pro（luced to a small acute tooth，article5short， cup－shaped，article61arge，ovate，narrowe（i distally「，palm obliquely rounded， slightly crenulate，1ined with short spines，un（iefine（l from and running into the hind margin，finger slightly longer than palm；in female，article5rela－ tively longer，article6with the palm obliquely truncate（1，un（1efine（1by any （1istinct process from the hin（1margin，an（1arme（i with two short spines an（1

A C

B 写 G 、＼－

／〆 D N E ／γ・ H

、／／

／ F 1 ’モ K

∠ N蕊／覧」

‘、グ流

Fig。30．Mθ」露αゴ¢o短cα・sp・nov・Male・hQlotype8mmこA・B・dorsa正prQfile Qf pleQn segments2－5，and the segments4－5magni五e（11C，D，gnathopod1，an（1the art三cles 5－7magnified l E，F，gnathopo（12，and the en（i magni丘ed；K，telson．Female，7mm： G，H，gnathopod1，and the articles5－7 enlarge〔1；1，J，gnathopod 2， an（i the end magni負ed・

many spinules、Pleonal epimeraンperaeopo（1s，uropo（1s，telson，an（10ther respects are all nearly Iike in肱．46ε4づoh‘z4σ（1。c。）． πolo砂汐θ：KN No・、3170，male，8・O mm・乃ヵ6100σ1吻：St・7in Area VII， near low water marks，sand，W．T．about10。C in high water（bottom），Cl．18．16％， Jan．23ン1957． 300 K．NAGATA

R伽σグ々s：The new species is fairly well relaled to肱．4634廊h認4ンbut （1istinguishe（1by the（iorsal appearance，an（1somewhat（1ifferent forms of gna亡hopo（1s l and 2． The new one is also closely related to ル正． αz万ンわ7擁oσ ALDERMAN（1936，p．60，丘gs．26－32）particularly in gnathopods1－2，and the pro－ port玉onal length of pe（iuncular article30f antenna1，but here distinguished by the following respects l in M．oα砺07耽σ，pleon segments2－3untoothe（i， pleon segment4with three dorsal teeth，eyes roun（1e（i，male coxa l distally expanded，article50f male gnathopod l longer than article6，palm of article 60f gnathopo（i l oblique（probably like in J．L BARNARD’s figure of肱，4654ぎ一 chσ4α），an（1article60f gnathopod2in my specimens more fully elongate． 1｛owever，the above－mentioned two eastem Paci丘c species and the present new one appear to be essentially pretty akin to each other。It is also note（1 that this new onle is somewhat related to Ml．so卿o∂磁BuLYcHEvA（1952，p．226，丘9．25）． According to the pleonal tooth formulas of species in the genus1吻」吻 given by J。L BARNARD（1962a，p．107），the new species agrees with肱．Jigπo一ヵhJlαJ．L．BARNARD（1961，p．225，Hg．77）from Gulf of Panama，915m in（1epth， in the same arrangement of dorsal teeth，i．e．0，1，1，1，4in acc㏄dance with the or（ier of pleon segments1－5，but in the latter species，eyes absent，an（1 male gnathopod2shows a di登eren重form in article6．

Mσ07αS6プ鰯伽1脚，sp．nOV。

（Fig．31）

ル勧67鰯θ耀郷吻づ：Areas IV（7），V（1），VI（7），VII（5），IX－b（7），IX－d（14）， XI－a（4），XI－b（2），X皿一b（8）．Total：55specimens，up to8．O mm in length l fromnearlowwatermarksto52min（iepth． P6soプゆガo％：Bo（ly slender，smooth；coxae1－4shallow，subsquare，the front comer of coxa l acutely pro（1uced，coxa5deeper than coxa4．Thir（l pleonal epimeron with the lower hind comer produced to an acute small tooth， not serrate． Lateral lobes of hea（1subtruncate，post・antennal corner acutely produced，eyes ovate．Antennae slender l pe（luncular article20f antenna l subequal in length to article l which bears three spines al ong the under e（lge，narrower；nagellum rather shorter than the peduncle，about17－ jointed l accessory且agellum well developed，usually lust a little shorter than a half the length of the primary且agellum，about6－jointe（1；antenna2，glan（1－ cone of peduncular article2reaching only to the mid（ile of the article3， article5shorter and narrower thau article4，flagellum subequal in length to peduncular article5，about7rjointed．Maxilla1ンinner plate with2setae； mandibular palp nearly typicaL Gnathopo（111article5as long as article6， both wi（lened distally，article5with the anterior margin very slightly 1・0伽脚吻卿肋痂ヵo面oμh8Sθ≠o正痂舷Sθα，111 301

（1epresse（1near the（1istal comer．Gnathopo（i2；article2without antero－distal lobe，article4pro（iuce（1to an acute postero一（iistal tooth，article5cup－shaped， article6very large，10nger than broa（i，nearly rectangular，a little wi（iened to the palm，which is transverse，serrate（1with6subacute（1enticles，（iefined by a strong tooth from the hind margin l finger slightly convex at the mi〔1dle of inner e（1ge。 Peraeopods1－5；finger each pro（iuced to a nail dorsally bearing two minute teeth as丘gure（1here．Peraeopods l an（12slender．Peraeopods3－5；

C A

臨 ”

！ W l

D E B

Fig．31。物67σ3θ7錫⑳召伽σ，sp．nov．Male holotype，7。O mm：A，1ateral view；B，end of gnathopo（12；C，nail of finger of peraeopod5；D，uropod3；E・telson・ article2with the hind margin mimtely serrate，article4rather broa（1；article 20f peraeopo（13somewhat narrow夕while those of peraeopo（is4an（15mo（ler－ ately expan（1ed l peraeopod3much shorter than peraeopods4an（15which are subequal in length。Uropod3scarcely extending beyon（1the other皿opods， rami equal or subequal in Iength，the apices truncate，arme（1with several unequal spines． Telson slightly longer than broad，（leeply cleft，each lobe tri（ientate at the apex which is armed with a long and a short spine， 302 K．NAGATA

肋10砂吻：KN No。3055，male，7mm（丘gured）．7ン勿Joo4」勿：St．2in Area VII，4．Om in high water，Jan．23，1957，Zo3オ吻belt，mud，W．T．9．8。C，Cl．18ユ6％o。 R翻σ7々s：The new species is closely relate（1to M．初α昭％ゆ6s（CosTA），M1． g％ゴ7初碗σ（DANA），an（l M．勿o麺oσScHELLENBERG，but distinguished from any of the above three species by a prominent sculpture of the palm of male gnathopod2，a character unique among the hitherto known species of this genus，an（1which is consistently represente（1through the growth series up to8．2mm long in the materials at hand．In the specimensンfemale cou1（1not be（1istinguished from male by any prominent characters，particularly in gnath－ opod2，both sexes show similar form both in the shape an（l in the size。In fact，this peculiarity is also indicated by WALKER on肱．30翻灘郷（1904，p。 273）that the size and shape of the han（10f the second gnathopod is much the same in male and female．

ハ廊67611σ≠伽％初昭％α（BATE）

漁θグσ紹犯擁彫σ％傷STEBBING1906，p．436。ハ血θ76〃σ渉伽漉郷σ麗σ，CHEvREux1911，P。219，fig，11＆P1。15，figs．1－13；CHEvREux＆FAGE 1925，p．242・figs．253－254．

ル餅67翅召gσ吻％04：Area XI－b，20vig．female specimens，4．2and4。5mm in length；from（lepths of50－52m，Sept．4，1960．ノ～翻4鴻3：The present female specimens agree fairly wellwilh CHEvREux’s （1escription and figures of M．勧％鋤σ紹，except for the following minor（1etails： The third article of man（1ibular palp is not fully falcate l（10rsal armatures of pleon segments1－6shown by the arrangement of1伊3，3，2，2，0in or（1er； uropod3with the rami rather broa（1er than those of female Hgure（1by him． P魏励観o％：Coasts of Scotland，England，and France l Mediterranean（N． of Tunisia），10－180m．

C醐406％s（、06競oθzσ400％3）o砂6郷’3SHEARD

（Fig．32）

ハ拓4θ7α7％δ70卿σo％」α吻3，STEBBING1888，p、1008（part），pL95，E． Cθ〆σ400％s（D。）oαρ6π舘3SHEARD1939，P，290，

漁」6吻♂疏伽加4：Area XI－a，St．8，5specimens，up to12．5mm long l from depths of47－53m，san（1y mu（1． R6脚7彦3：SHEARD in his paper of1939re－examine（1an（1revised the species of subgenus Pθ吻oθ7σ400％s，an（1〔1ivi（le（i into7species．Now following his key to the species，my specimens fall into C。（Z）．）o勿6郷づs．Howeverンthe identi一丘cation（10not necessarily fully content myself in the following respect，e．g． 04吻鯉zσ7ガ46α％且％zカhJカ04σ o∫∫hθ Sθずo 乃zJ4κ4S6α，111 303

the lower hin〔1comer of article20f peraeopo（is3－5rather similar to that of of〆zの70卿40％1醜z63。 SHEARD gave no ful1（iescription an（1figures of this species， therefore the differences coul（1not be fully examined．、0づε師δ罐oη：South Africa（off Cape Agulhas，274m，an（1Table Bay）。

A A 轟

、・「㌦ N

～

！殉 B コノ／ ■ 多 F 口！『 ’ C ’ 『 ’ ■B、厨ド、嘉

（Fig。32）（Fig．33）

Fig．32．Cθ解40伽s（P．）o砂θ郷づ3SHEARD。A，Iateral view of female l B，male gnathopod21 C，telson；D，uropod3． Fig．33．Eガo亟3θ〃4360hθ〃β刀ε診s（CHEvREux）．A，1ateral view；B，gnathopo（12；Cy accessory flagellum of antenna l l D，uropod31E，telson．

E7づoが3σ6Jo％9厩召（BRUZELIus）

肋・伽・」・％9碗，DELLAVALLE1893，PL38・五gs・17－30＆P1・60・且9・5；SARs1895・P1・181・ fig．2；STEBBING1906，P・411・砿伽吻16窟吻n64＝Only one male specimen，7。2mm long；from St．10in Area V，1．8m in depth，Mar．1956． R6耀吻s：The specimen is well allie（l to E。610％gσ渉σfigured by SARs，ex・ ceptf・rthef・ll・wingrespects：Access・ry且agellum・fantenna1・ne’j・inted・ and reaching beyon（l the end of the Hrst primary且agellar article；pe（1mcle of uropods1－2relatively Iong，particularly that of uropod l much longer than the rami，just like in E．ohづ1々6％sづs（CHILToN1921a，p、531ンfig．4，as in Nづヵhα7g％s σ．）frQmChilkaLake，lndialEachexpansi・n・f3rticle2・fperae・P・ds3－5 304 K：．NAGATA

1ike in E．6Jo％gα如，but the posteriQr margin rather straight l the general appearance of peraeopo（1s1－5rather similar to E．oh11舵πsぢ3，except for article2， particularly in the broader an（1stouter form of articles4an（15． Otherwise，the specimen agrees entirely with E．θlo％g諺α、Characteristic form of male gnathopod20f this specimen is very distinctive from both that of E。6hづ1々6％3」3figure（1by CHILToN（1．c．）and that figure（1by K・H・BARNARD taken from Lower Bengal（1935，p。283，fig・3）・ P魏7伽’加：Lofoten Isles to Great Britain and Me（1iterranean。

E7づo汐♂3θllαs60h6〃6多z3Js（CHEvREux）

（Fig．33）

Eガoψ」εσε60hθJJθ％3」3CHEvREux1901，P．403，f圭gs．19－23、ハ厚ρhσ79％30h〃々θ難3づ3，（not CEILToN 1921a），CEILToN 1925，P．534，丘9．1． EガoμεθJJ‘z s60hθ〃6％εガ3，K．H．BARNARD1935，P．284，fig．41RuFFo1958，P．6，figs・1－2・ Gammaridae undet。sp．，NAGATA1960，P．173，pL15，figs．72－79＆P1。16，丘gs，80－92・

1レ須躍67」αl o耀別初醒：Areas I（98），II（11），III（4），IV（201），VII（28），IX－d，（2）， X（9），XI－a（528），XI－b（35）．Tota1：916specimens，up to5．5mm in length； from（1epths of Zo3！θ7σbelt near low water marks（where the tide（10es not entirely rece（ie even in the spring tide）to50m．Generally inhabiting abun－ dantly on the mu（l or san（1y mud bottom deeper than low water marks，as the members of Ampelisci（1ae． R6耀7ゐs：The specimens seem referable to the present species without much（ioubt．Re－examination of the specimens at hand is as follows＝Eyes sma11，roun（i，the facets in some fresh spec孟mens compose（10f three，light red，reticulate（l with milky white．Gnathopo（1s l an（12；article6rather closely resembles that of CHILToNナs figures of IWヵhαγg％s oh戯6％sおthan that of CHEvREux，s one of Eガ01り」3σ3θoh6116％3Js，but the brea（lth of the article6is somewhat variable even in my specimens，although the shape is usually triangular an（i the palm is always longer than the hind margin。Peraeopods 3－5；且nger nearly as（iescribe（1an（i figure（1 by CEEvREux，the shape ungui－ form，bearing one or two spinules at the base of the ungula（the slender form of the legs Hgure（i in my prece（1ing paper was cause（1by not being depressed un（ier the cover－glass），The apices of telson pretty variable in shape，rounded or pointed，sometimes rather notched just by the apical point。 Coxa l sometimes strongly produce（1at the anterodistal comer as seen in CHEVREux，s figure． J．L．BARNARD in his paper of1962a（p．110）created a new genus A碗σ膨1加 having much close resemblance to the genus E710ヵ舵〃α，from which it differs only in wanting the second article of the outer ramus of皿opo（13，an（1he says that the un（ieter｝nine（i genus an（i species Qf Gam瓢aridae describe（i by G伽脚吻6翻∠4吻hゆ04σoμheSθオ01吻％4S6σ，π1 305 me in1960shou1（i belong to the presen亡new gems．However，he may have overlooked the genus E7Joρ魏llσ，which perhaps be identical with1〉6㍍耀」伽， In fact，Nθ如駕61吻ooπ認σ，new species（lescribe（l therein appears to be much closely related to E．sθohθ〃佛5♂3figured by RuFFo（1．c。）in the similar shapes of articles5and60f gnathopo（1s l an（12． P魏7あ諺づo飽：Seychelles Is．（CHEvREux）； Tale Sap， Siam （CHILToN）； Travancore，In（lia（K．H．BARNARD）．

惚9伽70卿s4gJl乞3HOEK

砿θ9召」％70ρ％εσ9昭3，DELLA VALLE1893，pL34，figs，1－17；STEBBING1906，P・4201CHEvREux ＆FAGE1925，P．226，且gs．236－2371GuRJANovA1951，P．745，fig，515・

砿伽吻l o耀吻n64：Area XLb，5female specimens，up to4。2mm in length l St．22，54－56min（1epth，Sept．4，1960． 1～6脚7々s：The specimens agree well with CHEvREux＆FAGE’s description an（1figures． Z万3か蝕％〃o鴛： Widely ｛1istributed along the European coasts l Kattegatヲ Holan（i，Firth of Forth，Liverpool Bay，English Channel，Bristol Channe1， France，Gulf of Naples，an（1Black Sea．

Family DEXAMINIDAE

Ko”o≠h63カθ吻30∫D醐α，痂躍σθ

Lateral lobes of hea（1with an acute point at apex＿＿ Pσ7σ48颯吻nθ枷7郷74づ Lateral lobes of head rounded at apex ＿ Pσ7認6劣伽伽ガ耀θ7sづ

P¢7σ4召％σ郷」％6プあ％467ε歪（STEBBING）

Pθ劣α卿づ％θノ露犯4θ7s♂STEBBING 1888，P1・137c・ 0％θ7πoσガ伽‘」θ73∫，STEBBING1906，p、522，fig．92． Pσ7σ4θ劣σ吻吻θ〃初4θプ3」，STEBBING1910ンP・6037PL52；SHEARD1938・P・185・

砿磁7伽16羅吻％64：Area IV，8specimens（6females，2males）up to5。8mm in length；from（1epths o｛10－25m。 P魏7伽露o％：FlindersPassage，BassStrait，15m；o鉦PortHacking，and o丘Wata Mooli，54－59fathoms．

Pσ7α46劣α窺伽θ6σ7％σプ漉SHEARD

（Fig．34）

Pα解4θ％4卿痂θ6σ7％α74J SHEARD1938，P。178，fig．6． P47σ4θ郷甥初θカσo顔oσ（non THoMsoN），NAGATA1960，P・174，pL16・fig・93・

μ碗θ酉αl g耀卿解4：Areas I（1）～IV（1643）7V（11），VI（77）署VII（72）～IX－b（644）F 306 K．NAGATA

IX－d（875），X皿一a（2），X皿一b（48）．Total：3373specimens，up to6．O mm in length．Abun（iantly found in Zoε∫θ7σbelt near low water mark． 1～翻α鴻3：After the Seto Inland Sea specimens had been referre（i to P．釦o魏04in my prece（ling paper（Lc．），Dr。K：．SHEARD kin（11y sent me his copy on the genus Pσ7σ46耀吻彫in which he analyzed strictly their distinction among the eight species of this genus． According to his paper，the specimens are conforme（1with P．わσ7nσγ認 of the釦6麺oσgroup。This species is much closely related to P．釦o顔oσ，but

鐵蕊、

A ／

／ ∠

など怒

Fig．34。Pロ7σ4θ紹痂π6δ47郷7漉SHEARD．A，lateral view of female l B，gnathopo（12；C，telson．

（listinguished by the following two characteristics l1）gnathopo（i2，article5 more than1．5times as long as article6，2）10wer lip with one minute tooth on the apex of each outer Iobe．疏3’痴観oπ：Off Three Kings’Islan（is，north of New Zealan（i（co1L by ‘Terra Nova，Expedition）．This species is also recorde（1by me from Zosず6フ・4 belt of Mutsu Bay，northem Japan．

Family TALITRIDAE ρ70h6sあ召グ諺6n3づ5ノσヂon♂oσ（TATT耳RsALLl θα”z吻α7146σ％且％zカhゑ汐04σo∫’h6 S6ず0 1％」σ％4Sθ4，111 307

Tσ1070hθεあ4ノ¢o漉昭TATTERsALL1922，P．452，pL21，figs．1－10。 076ho3∫彪ゴαψo漉oαンSTEPHENsEN1935，P．6， 070hoε畝zμ躍6薙3」3／4カo擁oαIwAsA 1939，P．261，PL10＆text－figs，4－6’STEPHENsEN1944， P．59，五9．17．

M伽吻1召紹吻％64＝A large number of specimens from high water marks of Area IX l max．14．3mm long，male（see Part II）． P魏7伽房oη：Widely distributed on the beach of Japan from Hokkaid6 （Wakkanai）to Danzy61s．，west of Ky血sh血l sometimes limicolous，terricolous。

Family HYALIDAE

K6‘y ≠o ≠hθ εカ‘26」θ3 0／1f夕σだゴαε

1。Gnathopo（12in male，article5masked behin（1by article4＿ 2 1．Gnathopod2in male，article5produce（i between articles4and6 3 2．Finger of peraeopo（is minutely pectinate Hyσ」687伽4∫oo7勉3 2．Finger of peraeopo（1s smooth，not pectinate。＿＿．g π粥Jo30h厩4あ 3。Antenna2strongly feathered below＿ノ4」10κh63加3μκ卿ノoo7短3 3．Antenna2not feathered below＿、。． AJJo70hθ3オθ3昭g％3劾s

五砂‘zlθg7σ1Z‘お00”Z歪3（KRφYER）

Hツ4♂θカ7θ砂03ガづ（part），DELLA VALLE1893，P1．2ンfig。6＆P1．16，figs．23－42・〈再魏4％o∂40詔4」朋4毎o THoMsoN1879，p．235，p1．10－B，figs，1，a－f。 π解」θπo頒θ紹σ」伽4毎θ，STEBBING1906，p．567；IwAsA1939，p．276，pL16＆text・旦g。16、 ∬夕σ」θ97伽4記07初3，STEBBING1906，P．5661K．H．BARNARD1916，P。230；RuFFo19507P．551 K H．BARNARD1955，p。93，fig。46；HuRLEY1957，p。904，昼gs．1－23（with two forms 難ooσθ～6σ」σ”4ゼσθan（1≠ho卿soπ歪），

漁紛翅6耀耀勿64：Area XIV，11specimens，up to10mm in length l among algae near low water marks，May31，1962． 1）鰯痴観o％：Chile（Valparaiso），New Zealan（i，South Africa，South Atlantic （Gough I．），S．W．of New Ze＆land（Macquarie I．），Antarctica（Commonwealth Bay），an（i Japan，where it is known by IwAsA，foun（l among algae near Iow water marks from Hokkai（16to Ky血shu．

理yα16 30hηzガ4ガ（H：ELLER）

Hツσ」θsoh”zJ4ガ，STEBBエNG1906，P，571；CHEvREux1911，P・237，P1・16，figs・9－121CHEvREux ＆FAGE1925，p．288，丘g．299；IwAsA1939，p．278，pL17＆text而g。17．

M惚吻16辮〃z吻4：Area XIV，30specimens，up to8．O mm long l among algae near low water marks，May31，1962。 0魏万δ嬬oπ：Azores，Canary Is．（Tenerife），Portuga1，and Mediterranean l Japan a孕d the neighboring waters（HokkaidO and Korea Strait）～ 308 K．NAGATA

・4〃oκh6s渉6s伽9％3オ％εDANA

∠4〃070h63」θs伽9％ε劾3，J．L．BARNARD1952，P．20ンpL5，figs．2－61J．L．BARNARD1954a，P・21， pL21． z4〃070ho3紹ε吻4〃60」％3STEBBING1899，P．409，pl。33－A；IwAsA1939，P．285，pL20，text・旦gs． 20－22．

砿碗吻」6耀吻彫4：Area X，only one male specimen，9mm long l St．2， 20－23m in depth，June2，1959． 1～6灘7h3：This species is also recor（1ed by me from the inshore waters near Shirikishinai，Hokkai（16． Pゼs’7あ躍ぢon： East China Sea，Klorea Strait，Japan Sea（E．of Korea〉（STEB－ BING，1899）；coasts of Oregon and Cahfomia（DANA，STIMPsoN，STouT，an（1」．L。 BARNARD）．On the Japanese coast，found on the beaches of Akkeshi，Muroran and Bir6in Hokkaid6，by IwAsA．

．A〃070h63！6sカlz‘仰zづoo7銘Js （H：ELLER）

z4〃070h6ε≠63μ％別Joo7吻ε，STEBBING1899，P．412，P1．33－C；STEBBエNG1906，P，583；CHEvREux ＆FAGE1925，p．291，且g．302；IwAsA1939，p．289，pL22，text．figs。25－26；STEpHENsEN 1944，p，71，昼g。25．

M4’θ吻16κ伽惚4：0ne male specimen，ca．8．O mm in length，from the tide pool of Area IX，Jan．20，1958． D魏7伽’魏：Mediterranean，and Japan（Hokkaid6and Japan Proper）。

Family AORIDAE

Kθク！o ≠hθ 3カ60∫03 0．プ1α07」4σ0 1．Antenna1，accessory flagellum well developed Ao7σ砂ゆ此α 1．Antenna1，accessory flagellum absent or ru（iimentary 2 2．Gnathopo（11in male（1ensely setiferous 且070歪4θ3S60％πゴσ 2，Gnathopo（11in male not（1ensely setose 14070∫46s ooJ％窺ゐ∫α0

・40プσ砂卿σKRφYER

イ40紹砂μoσ，THoMsoN1879a，P．3311THoMsoN1881，P．216；STEBBエNG1906，P・587，五9・ 101；CHEvREux1907，P．510；CHEvREux1911，P．242；CHILToN1911，P．5651K．H． BARNARD1916，P．2361CREvREux＆FAGE1925，P．293，figs．304305．イ407αg7召o〃ゼs，SARs1895，pL193・且07σゐθ79％6Jo擁STEBBエNG1888，pL109，figs．a，（L 且074∫擁ohoδoε≠7』yoh％εSTEBBING1888，pL109，figs．b，c，砿比7046％！oヵ％3卿40％♂〆％3THoMsoN1879a，p．331，p1．16，figs．5－8；THoMsoN1881，p．217，p1。 8，五gs。7a－c．

Ml切θ万α16羅痂％4：Areas IV（17），VI（21），VII（30），XIII－b（5）。Tota1：73 specimens7up to7？Q算m long。Fou耳（i fro；n多ρ吻解りelt耳ea「1Qw w＆te「無a慮＄ Gα盟z”zσ7」4θσ％且％zρhづカ04αo∫∫hθ S6！o 乃zlα％4Sθσ，ZZ1 309 to a d、epth of5．5m in low water． 1～θ脚廊：Male gnathopod l of a specimen of6．5mm long resembles fairly well in the general appearance that of SARs’丘gure of∠4。g7σoづ1ゼ3，but article 2with a triangular tooth on the anterior margin as in New Zealan（1specimen describe（i by THoMsoN（1881，P．217）l the apex of article4not always reaching the en（10f article5；article5much elongate，longer than article2，about4 times as long as wide；article6about three丘fths as long as article5，bearing a minute tooth at the postero一（1istal en（i，but has no spine on the posterior margin l丘nger about two thirds the Iength of article6；several fascicles of long setae are seen on the（listal en（i of article6。 Male gnathopod2，female gnathopods1－2，peraeopod1，and the slen（1er mandibular palp are all nearly like in those of z4。師ohoみoε卿oh％s丘gure（l by STEBBING．Pleonal epimera1－3each with a tooth at the lower hind comer， the tooth also seen in the thir（l pleonal epimeron（1escribe（1and figure（1by CHEvREux＆FAGE、The palp of maxilla l lined with several simple，slen（ler spines along the inner margin above half the Iength。The most peculiar feature of my specimens is that the lower lip has the principal lobes ex－ cavate（i on the same portion as seen in the species of Ampithoidae，and the mandibular process somewhat strongly constricte（i at the base．It is also note（l that coxae1－4somewhat sha110wer in comparison with the correspon（1－ ing peraeon segment than in SARs’figure of z4．g7αoづIJs，an（1pleon segment4 （10rsally with a pair of seta．Antenna2an（i peraeopods3－5are missing on all the specimens at han（1．那3≠励漉on：From the coast of Norway to South Africa；Me（1iterranean。 Indian Ocean：Kerguelen Is．South Pacific：Australia，New Zealan（1，Chile， Gambier ArchipelagoシKerma（iec Is．，an（1Auckland Is。

z4070’46s ool襯伽6WALKER

κ4070漉300」聯伽8WALKER1898，p．285，p1．16ア丘gs。7－10；STEBBING1906，p．586；J。L BARNARD1954a，P．24，P1．221NAGATA1960，P．175，P1。16，fig・94・ z4070昭830σ」が07初04ALDERMAN1936，P。63，figs．33－38・

Mα惚7翅θ鵜雁麗6：Areas I（101），III（1），IV（580），V（14），VI（7），VII（72）， IX－b（2），IX－d（55），XI－b（1），XII（27），XIII－b（6），Tota1：866specimens，up to 5．Omm long；Zos！67σbelt near low water mark to a（lepth of20－25m． Pづ3渉7あ％あo銘： Puget Soun（i，an（i California・

z4070躍6s360％κ磁GuRJANovA

∠4070躍θ3εθo観磁GuRJANovA1951，P．828，fig。579．

砿伽擁σ1θ鵜吻％64：Areas IX一（1（16），XIII－a（1），X皿一b（3）；up to5。Omm Iong，foun（1betweennear1Qwwateロnarkan（i2mli無eattheoutsi（1e， 310 K．NAGATA

ノ～6駕召漉3： This species is characterise（1by maIe gnathopo（11covere〔1all over with a thick brush of plumose setae，but the specimens are not entirely conforme（i with GuRJANovA’s description an（i丘gures．Eyes small，subtrian－ gular（narrowing belowン Antenna l without accessory且agellum l flagellum of antenna2with three joints，each tipPe（1with a long curving strong spine・ Mandibular palp very slight as in∠4．ooJ％励吻，but the article2about twice as long as article1，article3two thirds the length of article2，an（10nly fur－ nished with two long setae on the top of article3．Peraeopo（15much longer an（1 slen（ier in proportion to his 丘gure， an（i much longer than the prece（ling peraeopo（1s．Telson longer than broad，narrowing distally，the apex roun（1ing in male，excavate（1in female in dorsal view respectively，with2－3setae on each si（1e of the apex．Color whitish，with speckling of small black spots，par－ ticularly along the articulate line of bo（iy segments。 Pお≠7あz4ガo％： Russian coast of the Japan Sea （interti（lal zone of inlets）。

Family PHOTIDAE

施”o∫h6吻o∫6so∫Phoオ痂6 1．Uropod3with inner ramus much smaller than the outer， 2 1．Uropod3with the rami mt very unequal 3 2． Lateral lobes of head little pro（1uced Phoガ376」％h474歪 2，Lateral lobes of head much pro（1uced Phoガ3 Jo％9歪04z∫44！σ 3。Antenna1，accessory flagellum we11（1evelope（1＿＿。＿ 4 3，Antenna1，accessory flagellum obsole‡e PO400670，εお％露♂4σ 4． Gnathopod2，article6broad，oval form E％7ツsずh召鋸3ブσカo％歪o％3 4。 Gnathopod2，art圭cle6narrow，club－shaped E％7‘ソ3オhθ鋸s z‘∫廊zo卿づ∫

Phoガs 76ノηhσ7‘！J K：RφYER

Phoあs76動海σ7協，SARs1895，P．569，P1．2021STEBBING1906，P。607；SHoEMAKER1930，P．338； STEPHENsEN1940，P．611STEPHENsEN1942，P．369；ScHELLENBERG1942，P．200，fig， 1651STEPHENsEN1944a，P．231STEPHENsEN 1944b，P。117；SHoEMAKER 1945，P．3，丘9。1；GuRJANovA1951，P．843，fig．590．

砿漉7鰯6耀〃z吻4：Areas IV（2185specimens in tot我1，putting together with Pho！ゼs lo％g加％伽オσ），XI－a（59），XI－b（5）．Length：up to5。O mm．Foun（l from depths of10－56m． P歪s醒6魏o％：Aboreo・arcticspecies；inNorthAtlantic，southtothecoast of Connecticut，an（1to North Sea；in North PaciHc，through Bering Sea an（1 0khotsk Sea，to the Japan Sea．

Pho！♂3Jo噸o砿4伽（BATE＆WEsTwooD）

（Fig・35） G伽吻囲伽％∠4吻hゆ04αo方hoS6！o正痂舷S6σ，II1 311

Pho≠づ3Joη8蜘鋸4吻，SARs1895，p，571，pL203，且g，11WALKER1904，p。286，pL6，丘g，43； STEBBエNG1906，p。608；WALKER1909，p、3391CHEvREux1911，p．249；STEp煎ENsEN 1915，P。51；CHEvREux＆FAGE1925，P，310，fig．319；ScHELLENBERG1926a，P・231； ScHELLENBERG1928ンP．6621K．H．BARNARD1937，P．164；ScHELLENBERG1942，P。201，丘9．166；SHoEMAKER1945，P、11，fig・5；REID1951，P・262・

Mσ’6〆翅6紹〃吻6ゴ：Areas IV（2185specimens in total，putting together with Phoあ3グ翻h¢擁），XI－a（106），XI－b（9）；up to8．O mm in length；from depths of 10－56m． P麟励％だo％：From the south－west coast of Norway，along the European coasts，southwards to the tropical coast of West Africa l Gulf of Mexico；

，廼釜・ミ＼ A 、鞭所黛1、、一黛！ノ＼N

心＼＿＿貞／、＿ノ

A ー、ジ・〆ノ

（Fig。35）（Fig。36）

Fig．35．Pho渉ゼs Jo噸o側伽σ（BATE＆WEsTwooD）．A，lateral view of male l B，male gnathopod2；C，uropod3・ Fig。36． E％〆y3’h6％3／4ヵo卿o％s NAGATA。 A， lateral view of male；B，male gnathopod 21C，female gnathopod2．

Mediterranean an（1Suez Canal；on the coast of In（iian Ocean，South Arabian coast，British East Africa，Amirante，Seychelles，Carga（ios，Cey・lon，an（i Chilka Lake．Also known from the west coast6f Greenland，and Franz Josef Land， accor（1ing to ScHELLENBERG（1942）・

Ez‘7y3！hoz63ブのりo勉oz63NAGATA

（Fig。36）

E％7ツ3渉h9％3勉ψo漉o％3NAGATA1961a，P・32，fig・1・ 312 K．NAGATA

Mlσ’67紹6紹吻％4：Areas IV（10）ンVI（12）XI－a（1），XI－b（3），XIII－a（1）；up to8．Omm in length l from（iepths of2－46m．・0魏7伽あo％：Known only from Japan；Mutsu Bay to the west coast of Ky血sh｛1．

E％7yε’h6％3z‘≠初o盟z♂歪NAGATA

（Fig．37）

E％71γs≠hθ％s z‘あno彫露NAGATA1961a，P．34，f主9。2．

ル勧爾召」6耀吻％4：Areas IV（1702），XI－a（56），XI－b（3）；up to8。5mm in length l from depths of10一一56m． Z）1s師6観o％：Known only from Japan l also foun（l off Tsuyazaki，Ky血sh血 byme．

伊

／

，○ E C

（Fig，37）（Fig．38）

Fig，37。E％ηs∫h6％s％勧o彫ぢづNAGATA・Aン1ateral view of male；B，male gnathopo（121 C，article20f male peraeopod5；D，female gnathopod21E，article20f female peraeopo（15；F，pleonal epimeron3。 Fig。38，』肋zρ露hoβ∂σ砒Ja SMITE：A，lateral view of male；B，article20f peraeopod4．。4吻が’hoo o短o％彪」おDANA：C，male gnathopod2，A郷ρ露ho67σ卿o層J AuDouIN： D，male gnathopo（12．

Po400670ゆs’s勉ガ4σ（STIMPsoN）

Po400670ρsJsθJo硯7α渉4，SARs1895，p，576，pL205。 Po400θ70ρs♂s勉あ44，HoLMEs1908，p。543；STEBBING1906，p．6201CHEvREux＆FAGE1925， P。317，fig．326；SHoEMAKER 1930，P．3421Scl｛ELLENBERG 1942，P．194，fig．161； STEPHENsEN1944a，P。26；GuRJANovA1951，P．855，fig．600． σ翻脚吻θ傭且吻hゆ04σoμh6S6’01嘘％4S6α，π1 313

ル観爾σ」6耀雁n64：Areas XI－a（2），XI－b（2）；up to9．O mm in Iength l from depths of47－56m． P魏痴観o％：From Norwegian coast，aroun（1Faroes an（11celand，to Great Britain an（i France l Davis Strait to Rhode Island；East Siberian Sea，Chukot Sea，Bering Sea，Alaska（Alitak Bay，Ka（iiak Bay），and Japan Sea（Bay of the Great Peter）．

Family AMPITHOIDAE

κθy オo ∫乃θ 3カθoづ63 0∫∠し”2力舜hoJ4σθ

1。Third pleonal epimeron with the lower hind comer produce（1into a smal1シrounded tooth ・・……………・………………一・………・……・…・…■……………・・……＿＿ A”勿∫≠hoθ」α067≠03σ 1。Third pleonal epimeron with the Iower hin（1comer roun（1ed ．＿，．＿，＿．＿。．＿，．．．＿．．．，、 2 2，Gnathopod2in male，palm transverse ＿＿＿．＿。＿＿＿＿＿。＿＿＿＿イ4吻ρ励oθ灘〃吻 2．Gnathopo（12in male，palm oblique ＿＿＿＿．＿＿．、＿．＿。＿。．．．．＿＿．．．．＿。＿。．．＿。＿＿ 3 3．Gnathopo（12in male，palm deHne（1by a conspicuous tooth from the posterior margin ∠1吻ρμhoσ 7σ”zoπ4づ 3。Gnathopod2in maleンpalm un（1e猛ne（1from the hind margin ＿＿＿＿メ4卿ρ露hoo oガg雇観ε

z4別ρ甜ho6」σ06π03‘z BATE

イ4卿が≠ho6」αoθ7’03σ，DELLA vALLE1893，pL57，fig。37；STEBBING1906，P．633；J．L．BARNARD 1954a，P，31ンPls，29－30；NAGATA1960，P．175，pL16，flgs．95－96。 14郷力hμhoo郷σ07％7％εSTEPRENsEN1944，P・80，figs．30－31．孟卿ゆh露ho8ゴ¢o勉04STEBBエNG1888，p．1124，pL138－A；GuRJANovA1951，p。895，猛g．621．

ル勉ず67翅6耀雁％4：Areas IV（909），V（32），VI（26），VII（24），IX－a（7），IX－b （51），IX－c（5），IX一（1（1），XIII－a（2），XIII－b（19），XIV（1）。Total：1077specimens， up to25．Omm in lengむ11．Popular among algae or eelgrass in Zo3♂67σbelt near low water marks，and also found among the floating kelp． Ro脚嬬ε：！物ヵh髭ho6溺σo剛7％3STEpHENsEN from Port Shimizu of Japan is referred to z4．」σ067∫osσby J．L．BARNARD in his paper of1954a． In Challenger Report of1888，STEBBING（1escribed a new species，・4．ブ勿o漉oσfrom K6be Bay of the Seto Inlan（1Sea・and his description is based on the three specimens comprising only females。I have ha（1a large number of materials referred to イ4．ブ砂o沈4from the other various localities of the Japanese coast as well as from the Seto Inlan（l Sea，and it is unable to be（iistinguishe〔L4．1σo副05σat a11from the present female specimens of Aブゆo％加in the essential charac・ ters l for instance，in the forms of gnathopods1－2，in the powerful peduncle of uropod3，an（i moreover in having a small tooth at the lower hin（1comer of the thir（1pleonal epimeron，the last character is said by J．L．BARNARD to be unique in the species of this genus． On the other han（1，GuRJANovA in his paper of1951describe（1a male of z4．ブ砂o耽α，and the male gnathopo（12丘gure（i therein appears to have no 314 K．NAGATA

particular difference in the structure from those of both A1σoθ吻3σ丘gured by J．L，BARNARD an（1∠4．辮σ07％彫s by STEp虹ENsEN．He says there that A ブ砂on吻is widely（iistribute（l in the Japan Seaンfoun（l among seawee（10n the bottom between O－50m in depth along the coasts of Hokkai（16an（i the Russian si（le of the Japan Sea．I have already mentione（1briefly in my preced玉ngPape飼b・utthen・rthemspecimens・fJapan・f且．1σ剛・34f・und from the ins蓋e艶waters near Shirikishinai，east of Hakodate，Hokkai（16，whose male gnathopod2has such a cheliform component as丘gure（1by J。L．BARNARD （1954a，p1．29，F），an（l those northem ones are otherwise entirely the same as those from the Seto Inlan（1Sea in their characters．Even among Seto Inlan（1 Sea specimens，a slight in（1ication of the transition to cheliform coul（1be occasionally seen in the Iarger ones more than about20mm long。Differences of the relation between the（iegree of the chelate formation and the size of animals，or relative Iength of the pe（1uncle of uropo（13to the rami，are pro－ bably（1ue to those of each environmental condition in the various localities inhabite（l by the animals．STEBBING says in the Iast part on the new species， “The great simiiarity which prevails among the more or less de丘nitely ascer－ taine（1species of this genus，an（1the scantiness of the〔letails which in many instances have been thought sumcient for their identification，necessarily leave new species on a very insecure footing．To review all the species of ∠4郷ヵh露hoθwill be a task by itself for any one who is willing to un（1ertake it．”It is，thusソpretty sure that／4．ノゆoπ加is a synonym of∠4．1α067！03σ，an（1 the former is only a stage in the process of development towards the Iatter， Pゼs∫〆伽ず魏：A boreo－arctic form l to Oregon southwards on the Paci五c coast of North America，an（l to the Japan Sea in the north－westem Pacific。

澱盟ψπhoθ∂α距4σSMITH

（Fig。38，A－B）

且郷が∫hoθ∂σ〃4α，STEBBエNG1906，P．6351ALDERMAN1936，P．68臼J，L BARNARD1954a，P・34， pL31；NAGATA1960，p。176，pL16，figs。97－98。 ∠L雑ψh露ho6sh∫卿露％6π3」3STEPHENsEN1944，P．77，figs・28－29．？A勉ρ露ho9〃漉s％肋露J DELLA VALLE1893，P1．57，figs・30－32．

ル勧6万σ1θ∬σ吻％4：Areas IV（539），V（1），IX－b（2）；up to20．O mm in length。 Found in Zo3妙4belt near low water marks． Rε“zσ7々s：According to STEBBINGPs mention in－his“Tierreich”，∠4．裾渉s％一肋7露is known from Japan，an（i judging from DELLA VALLE）s丘gures，this species is probably identical with 且。∂σ1躍σ．His text is，unfortunately， unavailable to me． 1）∫s擁δ躍o銘：North Atlantic；New Jersey an（1Long Island Soun（i．In North Paci五c，from Califomia，Oregon，and Japan．Mediterranean（P）． 0㈱灘磁o伽且吻勧o吻oμh6Sθオ01蜘％4Sθσ，1π 315

且彫ρ甜hoo7σ吻o媚ゼAUDOUIN

（Fig．38，D）

且卿がオhoθ耀形o雇ゴ，ScHELLENBERG1928，P。665；K H．BARNARD1935，P．3051K，H．BARNARD 1937ンP。170；PエRLoT1938，P、346；ScHELレENBERG1938，P，87；K，亘，BARNARD1940ン P。480；SHoEMAKER1942，P．401J。L BARNARD1955，P、28．。4噸励oθ副〃㈱蕗，WALKER1904，p．291；STEBBING1906，p，6391CHEvREux1911，p、260， pL20，figs、1－4；STEPHENsEN 1915，P．511K．H．BARNARD1916，P。253；CHEvREux ＆FAGE1925，P．333，figs．341－342；GuRJANovA1951，P．880，fig．614． ∠4吻h露ho擁漉7耀伽WALKER1904，p・290，p1・7，丘g・46；WALKER1909，p・3411CHEvREux 1907，P．515，丘9．29；SHoEMAKER1921，P。102。 z4卿h露hoθJoδ伽WALKER1909，p．342，pL43，五g。9．且形が≠hoθづ吻づ3％7σSHoEMAKER19337P，255，fig．9、

！レ傭67翅6耀解惚4：Areas IX－b（4），IX－c（3），IX一（1（8），XIII－a（6），XIII－b（4）， XIV（4〉．Total：29specimens，up to8。5mm in length。Foun（1among sea wee（1in（lepths of low water mark to4m． P言s師伽ガo％：Very frequent in the tropical an（1subtropical seas。

z4解力露ho60万6班α1づεDANA

（Fig．38，C）

且郷ρ露ho60万θ勉‘z距s，STEBBING1906，P・6411J・L・BARNARD19557P・267fig・14・

Mi惚ガσ16∬粥伽4：Areas X皿一a（1），XIII－b（1）18．Omm and9、5mm in length，both males，found in the Zos卿αbelt near low water marks。 Pづs∫吻観o％：Philippine Is．an（1Hawaiian Is。

Family ISCHYROCERIDAE

κ6戸o♂hg吻oJθ30∫1sohy70097蜘6 Coxa5much deeper than coxa6＿＿ 1αSSα∫σJoθ如 Coxa5not much deeper than coxa6 肱比70ブσSS46％郷み76％ε♂ε

1σ33σ血1剛α（MONTAGU）

1433σルJoσ≠σ，SExToN＆REID1951，pp，29－91，pls．4－30（with many references）．

砿σ≠θ吻1砿σ雁％4：Areas IX一（1（1），XII（43）l up to5．Omm in length． P餅吻漉o銘：Cosmopolitan，except for the polar circles．

M比70ゾαsεσo％〃z6767zsづs（STEBBING＆RoBERTsoN）

Po40067％3傷郷670％εゴ3STEBBING＆RoBERTsoN1891，p，38，pl，6，B．砿記70ブσεεσoz‘卿δ76nsJε，STEBBエNG1906，P・651；CHEvREux＆FAGE19257P・350，fig・358・ 316 K．NAGATA

砿碗7翅齪卿惚4：0ne female specimen，2．5mm long from Area IX－d． R6吻召娩5：Three species of this genus have hitherto been known：砿．甥σ07000罪‘z SHoEMAKER（1942，P．44，figs．16－17），肱．〃渉oず6s J。L BARNARD（1954，P。 127，pls．35－36），an（1the present species・The specimen is un（loubtedly referred to this species，for I have examine（l several specimens of the species （up to4．5mm long，including males）from Ariake Sea，the west coast of KyUsh血ンand the male gnathopod2agrees well with that of CHEvREux＆ FAGE，s figure．ヱ万ε加δ鳩o％：Known from the coasts of Englan（l an（l France．

Family COROPHIIDAE

K（3‘y ∫o ≠hθ 3メ》goJθ3 0ノぐCo70ψh露づ‘z6

1．Mandibular palp2－jointed 、＿＿＿＿＿＿＿＿＿＿＿＿．＿。＿＿＿＿＿，．＿＿．．．＿＿＿＿ 2 1．Mandibular palp3－jointed g。＿＿＿＿＿り＿＿．．＿＿＿＿＿．。＿＿＿＿＿＿、＿＿＿＿＿＿g．10 2 Pleon segments4－6separate ＿＿ひg＿＿＿＿．＿＿◎＿＿＿＿＿＿＿。＿＿＿＿＿＿＿。＿．＿． 3 2 Pleon segments 4－6 coalesced 。・・一一一“＿．．＿■＿．、・一・一・一一一・・甲，．一．・・D・一・9一一一一・9・・・・・・… 一一一一 4 3．Uropod3ンramus ovate＿＿＿＿一＿＿＿ワ＿＿＿σ＿＿＿＿＿＿g＿＿g＿Co70助伽郷びo伽如’o〆 3，Uropo（13，ramus long and naπow ＿＿＿＿＿＿g＿＿＿＿＿＿。＿＿Co70助動卿海伽郷o痂 4 Lateral 正obes of head acu士e ＿，．．＿。＿。．＿。．．＿，＿。．＿＿＿．．．．．．．＿．＿ Co70ρh∫％郷07‘z33Joo”zθ

4 Lateral lobes of head not acute．．，．．．．．．，．，．，，，．＿．．．．．＿。．＿ひ．．．．．．．．．．＿曾．，，，，＿，，、．．『＿陰．＿．＿． 5 5．Antenna2，peduncular article4with a large terminal tooth＿＿＿（Male）＿＿＿＿＿ 6 5．Antenna2，peduncular article4without such a tooth ＿＿＿＿＿（Female）＿＿＿＿＿ 8 6 Rostrum triangular｝short＿＿＿＿＿。＿＿＿．＿＿＿◎＿…＿＿＿＿Co70助伽珊40舵7％ε露％吻 6．Rostrum lanceolate，10ng＿＿．＿＿＿＿＿陰＿＿＿＿＿＿、g．＿＿＿＿．＿＿，＿＿＿＿＿＿ 7 7。Antenna1，peduncular article l with a blunt outgrowth on inner surface about opposite mi（idle of rostrum ＿＿．．＿，．．．＿。＿．＿，．．．．＿。＿。．＿。．＿。．．＿，＿，．．＿。＿，Co70助彪卿初s薙♂oε％郷 7．Antenna1，peduncular article l without such a outgrowth＿＿＿＿＿＿Co70ρh伽卿麗6％oJ 8， Antenna2，pe（1uncular article4with spines set in a single row ＿＿Co70クh伽鯉κ8πo’ 8．Antenna2，peduncular article4typica11y with spines set in pairs，except the terminaL 9 9．Antenna2，peduncular article4typically with3pairs of spines and a single terminal one＿＿．．．辱．．．．＿。＿。＿り．＿＿。＿。＿．，．＿。．＿。＿．＿．＿．．＿．．。．．．＿．＿，＿＿，．．CoプoρhJ％吻 πohgグ麗3’o％彫 9．Antenna2，pe（luncular art互cle4typically with2pairs of spines and a single terminaI one．＿．．＿、．＿．＿，＿＿，．、ワ．．．＿．＿9＿甲．＿＿曾＿，＿．．．．．＿■＿り＿．＿。＿■＿Co70助」襯初s鰯05耀 10。Uropod3，ramus much shorter than peduncle＿＿＿＿。＿＿＿．＿＿＿g．．＿＿＿＿＿＿11 10．Uropod3，ramus longer than peduncle ＿＿＿＿，＿＿＿＿、＿＿．＿＿＿＿＿＿＿．＿＿＿12 11．Uropod2biramous＿＿＿．＿．＿。＿＿＿＿＿＿，＿＿＿＿．＿＿，＿＿＿＿E7餅hoπ♂％3劃8％砿 11．Uropod2uniramous9＿＿＿＿＿．．＿＿＿、．＿＿。＿＿＿…＿＿り…………C6名勿％3’麗伽臨ガ3 12．Third pleonal epimeron with the lower posterior comer quadrate G74％4躍飽紹〃σゴσρ0擁oσ 12．Third pleonal epimeron with the lower posterior comer completely roun（1e（1 ひ％（ゴoJθ〃α」％％α≠¢

Co70φh♂z御z∂ol％！‘zio7（PALLAs）

Co70ψh伽”¢σoJ躍α∫07，STEBBING1906，P。686；CHEvREux＆FAGE 1925，P，364ンfigs，371－372； CRAwFoRD1937，p．595；ScHELLENBERG1942，p．218，fig．1771STEPRENsEN1942， P．40g l SHoEMAKER1947，P。51，fig．1，k－n；GuRJANovA1951，P．981，fig．683． 0σ魏甥σ7茗46α％！1”z2うh∫ρ04‘z oノ’h6 Sθ！0 1％1σ％ゴS6αン1Z1 317

Co70φh∫z‘郷97033ゆ63ンSARs1895，PL219・ Co70ψh伽吻房o側4磁％卿，DELLA VALLE1893フpL56，figs．2－6．砿碗吻」醗佛伽4；Area II，24specimens，up to5．8mm in length。 R6脚7々3；There is nothing to remark particularly here，except for the Hrst pe（1uncular article of antenna1，which is arme（i usually with only a spine on the lower margin near the distal en（1． PJ8痂痂oπ：From W．Norway，along the European coast，into Mediter－ ranean，to A（1riatic Sea a且（1Black Sea（Sea of Azov）l the coast of Senegal l Bay of Fundy，aud Maine。

Co70ρh勿”zσoh67％s♂oz卿z CosTA

C70ρh彪彫σohθ7％εJo麗卿，CHEvREux1911，P．271；K・H．BARNARD1916シP・272（part）；CHEvREux ＆FAGE1925，p．368，fig。376；CRAwFoRD1937，p。617，fig．2－P l SHoEMAKER1947， P。53，figs．2－3；SI｛oEMAKER1949，P・761REID1951，P・26g l GuRJANovA1951・P・9773 fig．680；J．L．BARNARD1954a，P・36；HuRLEY1954a，P・442，figs・35－39；J・H・BARNARD 1955，p．3711RエE1956ンp，5，fig．6；NAGATA1960ンp．177，

砿α妙づα’6耀吻％64：Areas I（5），IV（979in total，putting together with both C．魏s薦♂os％郷an（IC．％6％oづ），V（1），VI（5），VII（1），VIII（1），IX一（1（23），XII（56）lall up to5．5mm in length。 Pづs励観o％：From the European coast to the tropical West Africal Mediterranean and Black Sea l Suez Canal l the coast of East Africa（Dar－es－ Salaam an（iDurban Bay）l Ba伍n Bay to Brazi1；British Columbia to Califomia； Hawaiian Is．，New Zealan（1，Hong K：ong（from a ship7s bottom）ンand Japan・

Co70汐h吻郷67σ3sづ607紹BRuzELlus

Co70助吻z o鰯3ゴoo7％θ，SARs1895・pL2201WALKER1904・p・294；STEBBエNG1906・p・690・且gs，116－118；CHILToN1925，p。538；CHEvREux＆FAGE1925，p．367．fig，3751CRAw． FoRD1937，P．607，fig．4，a－f l STEPHENsEN1942，P・410；STEPHENsEN1944b・P。132； SRoEMAKER1947，P．53，fig．4；SRoEMAKER 1949，P・76；GuRJANovA1951，P・976・五9．679。 M碗擁σ16劣伽吻4：St．20in Area XI－b，5specimens（one juvenile，four females，ovig．），2．5－3．7mm in length；47－52m in（1epth，Sept・4，1960・ PJs’7伽ガo％：Jan Mayen，Murman Coast（Klola Bay），Barents Sea，White Sea，East Greenlan（1；from Norwegian coast and Faroes，along the European coast to the Black Sea，by far extending to Ceylon and Tale Sap；on the east coast of North America，from Bay of Fundy to New York（Long Islan（1）l on the Pacific coast，Alaska（Chichagof L），E．of Kamchatka，an（l the Japan Sea。

Co70汐h伽％z z‘6％oJ STEPHENsEN

Co70ρhJ耀％θ％oゴSTEpHENsEN1932，p．414，figs．3－41CRAwFoRD1937，p，616；J，L．BARNARD 1952，P。28，pls．8－9；」．L．BARNARD1959c，P・39；NAGATA1960，P・178・ 318 K．NAGATA

物≠07翅6耀吻％θ4：Areas IV（see C．αoh67％3づo％郷），IX一（1（47），XI－a（20）， X皿一a（1），X皿一b（16）；all up to5．5mm in length． Pづs師厩翻：JapanandCalifomia．

Coプoρh珈吻初s鰯’03％郷CRAwFoRD

Co70ゆh伽吻初s鰯oε％吻CRAwFoRD1937，p．615，丘g．2，a－g；SHoEMAKER1947，p，53，figs、6－71 SHoEMAKER1949，P．77；J。L．BARNARD1959c，P．381NAGATA1960，P．177．

Ml伽7宛1θ耀駕吻4：Areas IV（see C．40hθ剛3魏吻），up to4．7mm in length． 1）づε≠吻漉o％：England，Denmark，Germany，and Italy；on the west coast of North America，Massachusetts（Newbllryport）and New York（Amityville， Long Island）l on the Paci丘c coast，Washington to Chile（Talcahuano）l and Japan．

Co70望うh歪z6郷々甜σ停zo万1，sp．nov．

（Fig．39）

砿磁67鰯6紹癬％04：Areas I（2），III（4），IV（6），VI（2），X（1），XLa（3）．Total： 18specimens，3．9－6．O mm in length，from（lepths of3－49m． 1）6307ゆ渉Jo％＝Segments of urosome separate。Hea（1with the front broa（ily convex，without a true rostrum l lateral lobes of hea（1narrowly rom（1ing at the apex；eyes not well developed（eyes position figure（l here are not right， an〔1they are properly placed into lateral lobes）．Antenna l rather slen（ier； in male about as Iong as the hea（1to pleon segment2combined；peduncular ar－ ticle l subequal in length to article2，expan（1e（10n the upPer surface，bearing an outgrowth near the base of the inner e（ige，an（i two spines Qn the lower e（ige，one near the outgrowth，the another near the（listal en（1；pe（1uncular article30ne half the length of the article2；flagellum11－lointe（1，about as long as pe（1uncular articles2an（13combine（i．Antenna20f a single male specimen unfortmately missing．Antema l in female a little longer than antenna 2；the first pe（iuncular article shorter than the secon（l an（i thir（i combine（i，bearing2－5spines on the proximal half of the imer edge，an（13－4 spines on the lower e（lge l flagellum with11－12joints，nearly as long as pe（iuncular articles l an（12combined，Antenna2in female bearing3－4 spines on the lower e（ige of the fourth article of peduncle，the fifth without spines，Hagellum3－jointed． Gnathopo（11nearly like in C。醜％1認％吻CHEvREux（1908，p．73，figs．4－5）． Gnathopo（i2in male；Hnger long an（l slen（1er，curved，nearly two thirds as long as article6ンotherwise gnathopodし2rather like in C．σo％」6σ劾彫CHEvREux （1908，p．70，figs。1－3）than in C．伽瑠」σ魏彫，particularly in relatively narrower article6。Gnathopod2in female nearly like in maleンexcept that丘nger very 04卿〃zσ7づ464フz／1％z汐h∫カ04‘z oプ’！h6Sθオ0 1π」α％づSθ‘z，ZI1 319

narrow an（i de1量cate，not curved but l量near，slightly narrowing towar（1s the （1istal en（1，which is not acute，bearing two long setae． Peraeopods l and2；article5proportionally Iong，about as long as article 4，血nger shorter than article 6．Uropod 3，ramus narrow，10nger than pe（1uncle，both margin spinose．且oJo砂卿：KN No。2979，male，4．6mm．丁夕勿lo6α1吻：St．9in Area XI－a，

B ／ A C J

／ D ＼

H G F

ノ

Fig。39．Co70汐h吻吻鳶吻解07露，sp．nov、Female，6。O mm：A，front of head，upper view l B，right antenna 1，upper view l C，right antenna1，peduncular article l magnified， inner side view；E，F，gnathopods l an（12；1，inner si（1e of peduncle of pleopod3； J，urosome an（1 uropods 1－3． Female，5．O mm：D，1eft antenna 2，articles4and 5 0f peduncle，and flegellum，inner side view；G，peraeopo（111H，peraeopo（13，with postero（1istal corner of article 5magni五e｛1．

42－49min（lepth，June14，1959． 1～翻α嬬3：The new species is closely relate（i to C．σ筋％1σ脇郷CHEvREux in having no true rostrum，and in having the outgrowth on pe（1uncular article l of male antenna1，but d近ers from the latter in the poorly（ievelope（l eyes，in the五nger of female gnathopod27and in comparatively long article 50f peraeopo（is1－2， 320 K：．NAGATA

E7づo魏o痂％s伽9％砿DANA

（Fig．40）

E7」6’ho∫z歪z‘3カ％9％σ劣，STEBBエNG1906，P．672；PエRLoT1938，P．352；HuRLEY1954a，P．445，figs。 40－61；NAGATA1960，P．179，P1．17，figs．99－102．

M伽7鰯6羅卿吻4：Areas I（1），IV（33），VI（15），VII（2），IX－b（2），IX一（1（43）， XII（37），X皿一a（4），X皿一b（71）．Total：208specimens，up to7．5mm in length， from depth of2m in low wafer． P♂3≠吻％！Jo％：Sulu Sea（DANA），East Indies（PIRLoT），New Zealan（1（HuRLEY）， andJapan．

Eず ∂ 拶 A

ダ。 A B

（Fig．40）（Fig．41）

Fig・40・E痂’ho漉％3勿9％礁DANA。A，lateral view of male；B，male gnathopod21C， female gnathopod21C，female gnathopod21D，peraeopod31E，皿opod3an（1telson． Fig・41・（｝7傭4躍」θ7θ〃σブ砂o短oπSTEpl｛ENsEN・A・Iateral view of male l B，accessory Hagellum of antenna1；C，antenna20f fema玉e；D，female gnathopo（111E，uropo（13 an（1telson．

σ7σ％碗漉076〃4ブσカo％づ6σSTEPHENSEN

（Fig．41）

θ7伽4躍Jo7θ〃σノ勿o短04STEPHENsEN 1938，P・179，figs。1－2；NAGATA 1960ンP．179，P1．17，五g．103．

M漉7鰯θ耀吻鰐づ：Are＆s I（6），II（12），IV（2023），V（49）VI（4），VII（78）， VIII（19），IX－b（1），IX一（1（45）．Total：2237specimens，up to12．Omm in length l fromthe（iepthofabout10matthedeepest。 σ伽脚瑠卿且吻hゆ04α・μh6S6≠01nl観4Sθσ，π1 321

o弼吻諺oπ：Known only from Japan．

C67αρz‘s加δz61α万3SAY

（Fig．42）

C6名砂％3伽δ％如ガ5，SHoEMAKER1942，P．481J．L．BARNARD1962b，P．61，五gs．28－29． Cθ7の％sσわ4」吻3，STEBBエNG1910，p。616ンp1．55A；PエRLoT1938，p．349，丘gs．157－158． C67αρ％3θ解θBuLYcHEvA1952，P．248，fig．39．ル勧痂41θ∬伽伽4：Area IV，45specimens，up to5．3mm longl from the depth of25m at the（1eepest。

％、傷彩％

7 ／『1 灘＼〆I A

＼愛

y E

、

（Fig，42）（Fig．43）

Fig．42。06解舞3魏伽伽万3SAY．A，1ateral view of male l B，male gnathopod2；C，female gnathopod2；D，articles4－70f peraeopo（13；E，peraeopo（15；F，telson an（1uropo〔1s1－3。 Fig．43． Po400¢7％s初oo％sが膨％3（STEBBエNG）．

1）13’励観o％：East coast of North America（：New Jersey，Vineyar（1Sound， an（1Connecticut）；Pacific coast of North America（southem Califomia，an（1 Lower Califomia）；South Africa l Indian Ocean（Mauritius？）；Ceylon，and Bengal；Indonesial North Australia，and New South Wales．

こ肋oづ0161彪1躍昭’4CHEvREux

ひπo∫oJθ」如 Jz粥σ如 CHEvREux 1911・P・264！text－fig・16 ＆ pL20・f量gs・5－161Sc耳Ep耳ENBERg 善928ヂP・669・五9・207コ 322 K．NAGATA

〃1磁θκσ16耀吻鰐ゴ：Areas IV（20），】ζ1－b（8）；up to5．O mm in length，alI female l from（lepths of1（ト54m。 R翻4嬬3：It seems to be fairly questionable whether male gnathopo（11 丘gured by ScHELLENBERG is that of male of the present species or not，for it resembles much closely that of members of the genusθ7朋4ゼ4卿6〃σ，an（i in Uno♂oJo〃σ∫θ∂θol観σK．H．BARNARD（1955，p．97，fig．49），their gnathopods1－2 are nearly alike in both sexes． ScHELLENBERG says in his paper，“a pair of Iarge male gnathopod l is lying loose with the materials．” The specimens at han（1are，to my regret，all female，and therefore I coul（1not confirm the account（1escribe（l by ScHELLENBERG． My specimens agree fairly well with CHEvREux’s description and丘gures， except for the following respects：Mandibular palp more fully elongate； both gnathopo（is of nearly equal in sizeンhaving two small spines at theかalmar angle of article 6；accessory flagelluln of antenna l bearing 2－3 articles； Hnger of peraeopo（1s1－2comparatively short，about a half the length of article 6． Pガs渉痴めo％：Algeria（CREvREux）and P Suez Cana1（ScHELLENBERG）．

Family PODOCERIDAE

Po400θ7z‘3♂％oo％3カ」6z弼3（STEBBING）

（Fig．43）

PJ碗oカh勉卿吻60％sカゼo％％”z STEBBING1888，P．1194，pl．131． Po400θ鰯s吻ooκsガoz‘％ε，STEBBING1906，P．702；PIRLoT1938，P．356，fig．1601K．H．BARNARD 1940，P．483， Po40067％3カσ」痂％ガK H．BARNARD1916，P．277，pl．28，fig．23；K．H．BARNARD1937，P．175， fig．18． Po4000プ％s sp．，NAGATA1960，p，179，pL17，figs．104－112．

砿伽吻16耀吻彫4：Areas IV（39），VI（14），XI－a（1）l up to8．9mm long l foun（i from depths of2－42m． 1～6彫α〆為3： 1（ientification for the species of this genus is truly difHcult in so far as the references are available．The present specimens are here referre（i to P．耽o％3ヵ♂o％％s by nearly complete agreement with male and female gnathopod2丘gured by PIRLoT．．0σ3’7伽オ魏：Port Jackson，New South Wales（STEBBING）；South Africa （K H．BARNARD）；South Arabian coast（K．H。BARNARD）；East Illdies．（PIRLoT）， andJapan．

ZOOGEOGRAPHICAL NOTE 83species and2subspecies of gammaridean amphipo（1s were found in the ＄サt・lnlan蒔♀a7真llgft耳eepclgsgdbaysalGn＄the¢・4st＄・f耳・nshち 0翻脚宛θ傭且吻勧04αoμhoS6！〇五吻％4Sθσ，IZ1 323

Shikoku，an（i ］Ky血shf1，are more or less recognize〔i as a“warm temperate” area．Many of the species fomd in the Seto Inland Sea have been，there－ fore，collected by me from other inlets or bays of the Japanese coast，an（i the occurrences of others are also expecte（1in future．It is a pretty well known fact that many of littoral gammari（1ean members are generaIly distribute（i wi（lely in the wor1（1ンthough they are benthic an（i normally inhabiting on the muddyseafloor． Of all the species describe（i here，59species（69．4percent）are found also outsi（1e the Japanese area，Their distributional outlines in respective regions are shown in Table1，an（1summarize（1in Figure44，in which the number of species in each region is shown as the percentage to59species．Here，19 reg圭ons are somewhat expediently define（1as follows： 1．Arctic region（Ba岱n Bay，Davis Strait，W。and E．coast of Green・ land，Jan Mayen夕Murman Coast，White Sea，Barents Sea，Spitsbergen・Bear I．，Franz Joseph Lan（1，Novaya Zemlya，Kara Sea，East Siberian Sea，Chukot Sea，an（1N．coast of Alaska）。 II．North・westem part of the North Pacific（Bering Sea，Okhotsk Sea， and the Russian coast of the Japan Sea－down to Bay of Peter the Great）．皿。Northem part of the Pacific coast of North America（coasts of Alaska and British Columbia）． IV．Southem part of the Pacific coast of North America（coasts of Washington，Oregon，Califomiaシand Lower Califomia－to Magdalena Bay southwar（1s）． V．Atlantic coasts of Cana（la an（l North America（Gulf of St。Lawrence to New Jersey）． VI．Norwegian coast，including Skagerrak，Kattegat，Baltic Sea，an（1 1celand． VII。 European coast（down to the coast of Portugal），including Faeroes， Shetlan（i Is．，and Azores． VIII．Mediterranean an（1its coast，including Black Sea and Sea of Azov。 IX．Northem coast of West Africa（down to the coast of Senegal）， inclu（iing Canary Is。and Cape Ver（le Is・ X．Tropical coast of West Africa（down to the coast of Cameroon）。 XI．Atlantic coast of Central America（coast of Flori（ia，Gulf of Mexico，and Caribbean Sea）． XII．Coasts of Indian Ocean，southwar（1s to20。S（Zanzibar，Amirante Is．，Seychelles，Cracados，Suez Canal，Red Sea，Southem Arabian coast，Gulf of Aden，Maladiv Is．，Ceylon，Chilka Lake，Tale Sapy and East Indies seas）。 IX皿．Tropical and subtropical PaciHc（Hawaiian Is．，Marsha111s．，Sulu Sea，Bismarck Arch．，Gilbert Is。，Fiji IsりN．E。coast of AustraliaシKerma（1ec Is．ンGambier Arch．，an（i Galapagos Is，）． XIV． Coast of Brazi1． 324 K．NAGATA

Table1。 D三stributions of the59species known also outside the Japanese area in respective regions．

H目ヒ＞ヌヌ国図 H 口日 ≧1＞タ写タ箆〉く閑園只図図図図図図

Soo4”z63 ∂αhJぢ詩許詩丑雑zゆ舘ho6 」‘zo67オoεσ 詩詩諒 Lo1》∫01》hoκ麗s∫σJoσ∫36s 砦詫 β‘Z∫hy郷θ40％ Jo2zgJ卿‘”Z％ε 詩詩キキ P彪％3’6ε汐σ％0φ」σ 詩詩詩を詩

Phoあ3 〆召幽zhσプ44 才を昏才

PO400θ70ρ3♂3勉ガ4σ 許詩キ詩才許 Co70，hゼ％”¢67‘zε3歪σoプn召諄詫砦才詩砦詩砦！17gJ33αhσ〃z¢ガカ6s 昔才芽砦才許諜才非 Phoガ3 Joπ9記σ％4¢オ4 詩許砦許才許才 Pπ7π1）ho躍％3 00％」¢オ％s 許些詩蔚許評評

Co70φhづ％％zσoho7％3♂o％卿諄蔚詩詩詩才詩著才蔚キ才砦

且π01ηκ2z％9‘篇力40∫弄o％3 著 Lo，」ゴoψgo7θ％”z加〃σ～ゴ砦且070づ4召ε 560％％4σ 砦 PO雇096π6’‘Z703かα如才許

z407σ敬，Jo4 キ詩キ守蕎砦才蔚許許ノ初3sσ∫初Joσずσ 葬許砦許詩詫砦暮井許尊些砦キ且”¢」ク舜ho6 z7σあづσ 許詩 Co70φhJ％雑z∂oJ3〆σ∫07 砦非蔚誇キ

Co70メ》h∫π鉛z勿z3づ4♂03％吻砦許才些

Cθ7σρ％3伽6％」4擁3 許蔚キ詩キ才且擁εガσ3カαo〃置o％3 キ G銘σκ0ψ3」3Zフ〃0746ε 詩 L6κooずhoθ σ」σ≠σ 砦 ZL〃070h6εオθε4％9％s∫％3 許

14070」σ6s ooJ％吻δ∫σθ 許 Co70カh6％〃3％6難o♂ 昔

1且名pzψ髭hoθ 74z’zoπ4∫ ・係詩 rキ『‘ 壕 1予蕎蕎

Mθ」カh診4」ρρσ δ076σ万ε 才

POκ渉007α≠0ε 4〃σ吻σ7∫犯％ε キ詩

SOOρ6Jooh6づ7％3 ho力擁才許痴

E万oρ♂εαθJo％9α魏係詫キ

10h％0ゆ％ε 齢％7％3 許才詩詳キ

／1駕ρ6」ぎSO‘Zδ7ω記07漉ε 皆静砦許才非才

砿あ70ブ4εε‘Z6％彫δ7θπε∫ε 許

伽97θ〃σ ’6％％」彫4n4 詩詩 Mθ9σ1％70，％S49〃」3 砦非 U70オhoθρ％Joh6JJσ 砦許寺 ∫∫‘yσ」6 s6h”麗4あ砦許詳 0伽耀磁卿。4吻hゆ04αo〃hθS6≠oZ吻擁S召σ，1π 325

Table1・（cOntd．）圏口目ヒ＞写目箏酋図臭受暴島藁舅舅暴賃

五6％oo’hoθ」％oJsσ 一一一一一一砦砦一許一一一一一一一一一 Zl〃070h63彰s1う」％”zπむo”zJ3 一一一一一一一詩一一一一一一一一一一一 Uκ0♂oJo〃σ伽紹如一一一一一一一砦一一一一一一一一一一一一 S翅oが4％」≠解吻σ7初σ 一一一一一一一一非蔚一許昔一許一一一一 S♂6％o≠hoθ9σ〃gnsづ3 一一一一一一一一一蔚許許許一一才一一一 κ4卿勿」∫soαo』yoJoカ3 一一一一一一一一一～一一砦一一一一一一一 ∫4％％o〃σ ohJlたθ％3」3 一一一一一一一一一一一許一一一一一一一 E7づoρお6〃σε6chθ〃6，¢3Js 一一一一一一一一一一一許一一一一一一一一！1”多φ甜hoθ 07」θ％渉4距3 一一一一一一一一一一一一才一一一一一一 E7づoオho％♂％3汐％gnσ劣一一一一一一一一一一一才蔚一一一許一一 PO40067％SづnoO％εがσ％3 一一一一一一一一一一一詳一一一砦著一一 C97σ400％εo勿6郷Js 一一一一一一一一一一一一一一一詩一一一 E薙46ρ0％7召郷〃4房1づ3 一一一一一一一一一一一一一一一一非一一 Lθカずσ雑zρho1》％s ％o∂σoβoσ」‘z％4」α6 一一一一一一一一一一一一一一一一許一一 Pσ耀吻塀形伽θガ伽ゴθ7ε診一一一一一一一一一一一一一一一一藷一一 Pα7α4θ劣6”z吻θδσ7匁σ74づ一一一一一一一一一一一一一一一一砦一一 E翅169躍綴♂oo解ず3 一一一一一一一一一一一一一一一＃才＃非砿θ」露σ々07召σ％4＊

且廊309π郷郷σ窺3σ耀伽4σ16ゴ＊＊

＊）Species found also in Makinoshima，Fuzan，Korea，that is not inc玉uded in any region、＊＊）Species known also from southem Kuril Is。，southem Sakhalin，and China，but all from fresh water localities．

り勢σ ，、もず（20，3） ‘ プ夢r曝

，、、ゐ

（37．2）

『》θ

（6。7｝曹 ④ 嵐

9〔潔の

Fig．44．Number of species in respective regions，represented as percentage to the tota1 59species shown on Table1． 326 K．NAGATA

XV． Tropical Atlantic Ocean（plankton co11ection）． XVI． Coast of South Africa． XVII． α）astsofNewSouthWalesandNewZealand，includingAucklandIs． XVIII． Coast of Chile（coast of Valparaiso and Juan Fernandez Is．）． XIX． Antarctiβan（l subantarctic regions（Falkland IsりSouth Georgia Is．， Orkney Is．S．，Kerguelen Is。，Macquarie Is．，and Commonwealth Bay）， inclu（iing Gough Is． of South Atlantic Ocean． On Table1，regions are numbered from the north to the south（Regions III an（11V may be place（1after Region V，but are here inserte（l just after Region II， as they are fringing all together the North Pacific），an（i species are generally arrange（i in the or（1er of northem to southern forms．It will be seen that many of the species have each a wi（1e range of（listribution． In fact，their distributions are so variable that it is（limcult to divide them into some de丘nite（iistributional forms；some of them are quite cosmopolitan， some species wi（1ely spread in the northem hemisphere，and several may be said，exten（1ing over both the eastem and westem hemispheres，to be nearly cosmopolitan in boreo－temperate seas，or in temperate to tropical，or also in boreal to trop呈ca1．As seen in Figure44，there are many species common to Japan and the regions far apart from Japan such as Regions V，VI，VII，V皿， XVI，an（l XVII，and this may be partly attributable to the fact that those regions have been well explored，since the early stages of the systematic study for this group． Most of gammarideans often make the noctumal migration towards the surface water，and therefore they are not necessarily found on the sea bottom， for instance some of them may be found among oyster shells hung from the oyster－raft in the waters more than10meters above the bottom，among the drift－algae in the tidal flow or ocean current，or found in colonies on the buoys in harbors．Accor（1ingly，they can be transporte〔i to the foreign waters together with oyster spats，or clinging to any ships anchored。 On the other han（i，it is very probable that endemic forms are differ－ entiated in such enclosed places as the Inlan（1Sea，affecte（1by the local climate． The following24species and2subspecies of the forms（1escribe（l in this paper arelimitedtoJapanesewatersatpresent． 070ho耀n6〃σ」漉07σJJε，sp．nov．み砂伽3ノ勿o痂o％3NAGATA 且噸θ」∫soσδo謝DAHL ハ蛋θ」ρhづ4」ヵφσgJoゐosσ，sp．nov・五解勿κεcσ吻ガs4た勿％3♂3DAHL 砿θ」ρ乃♂4∫ρρθπσSづπ％6夢ずσ，sp、nOV，。4吻gJ∫ε04吻hσ膨鰯3NAGATA 砿吻h細郷ノ砂o耽β，sp．nov。 A吻ρθκsOσπ漉々漉6％3♂3NAGATA 砿6あ如40πガoz‘’σ彪，sp．nov． βツゐあ3ゴ砂o痂o％εDAEL ハ拓oJ露σ∫寓みθ7σ％」σ渉σ，sp．nOV． π4ゆ物宛郷∫hσ7σθ難3ぎs NAGATA Miθ」吻ノ砂0耽4，sp．nOV．魏鋤079毎ブ砂0競4，sp、nOV．ル勧7σ3θ〆吻吻」耀，sp，nOV． LJJ鋤079宛3θ77惚，sp，nOV． 0κh6sガαμσ∫6π3♂3ゴαψo勉04（TATTERsALL） 14吻θ〃40％痂伽’吻，sp，nOV、 E％η3功θ％3ノ砂0痂伽3NAGATA ハ拓o％oo％Jo40s J伽卿oφh〃κ3ゴσ抄on記πs，subsp．nov， E％7少3≠hθ％3躍初o彫露NAGATA Sツ7吻漉s勿o肋％3，sp、nOV． Co70ゆh勉吻鰭佛o漉，sp．nov。 Pαγαカ」6％s≠6ε房o％sカoぢ40s，sp．nov， 074銘4躍琵7θ”σノoρo勉oσSTEPHENSEN

（To be continue（1） STUDIES ON MARINE GAMMARIDEAN AMP皿PODA OF THE SETO INLAND SEA．IV Klz6NAGATA

Inlan（1Sea Regional Fisheries Research Laboratory，Hiroshima

7V甜h4T6卑」一ノ2g％名os

CONTENTS

PART II Some Ecological Informations 1． General remarks on the biology of O76hθε枷μ碗oηsJsゴ勿o擁6σ （with Fig。45and Table2）， 327 2， An observation on the noctumal migration of the benthic gammaridean amphipods（with Fig．46and Table3） 331 3． A note on the comparison of species composition between the two di鉦erent areas（with Fig．47and Tables4－5）．■ 335 4． Gammaridean amphipods as prey．animals，with special relation to the triglid fishes caught in the Seto Inlan（1Sea（with Fig，48 an（i Tables6－8），．．＿，．． 339 REFERENCES 343

PART II．SOME ECOLOGICAL INFORMATIONS

1． General Remar］ks oln the Biology of Or6hθs8εα

pZα彦θπSεSノαゑ0πε6α

0κh6s磁μ磁6％3ぢsブσヵo彪oσis well known as one of the“san（1－hoppers” among the gam三照ridean group an（i commonly inhabits at the high－water marks on the beach；often found in a great abundance un（1er damp seawee（1 0r straw－mat washe（1ashoreンsometimes living un（1er（1ead leaves in the〔lamp places far above the sea－shore。The animal is a scavenger，showing the fee〔ling habit of a“biting”type，an（i often seen crowding together alld biting at the shucked meat of oyster while the animals are kept in an experimental glass－vessel in the laboratory・ The material was collected once a month from March1962to March1963， at the high・water mark on the beach of OnouraンSaeki－gun，Hiroshima Pref．， where the sampling spot was locate（l just beneath the stone wa11，submerge（1 always in the high－tide of each lunar month and covere（l all over with

PubL Seto Mar．BioL Lab．，XIII（5），327－348，1966。（Article17） 328 K．NAGATA

26，1963 March阻 5 lL 講一鑑』油Fobruary 25， 1963 5 10 15

－14 」巳nuary 10， 1963 100

0 December 12， 1962 10

o 騰諾。！ 1，1962

0 10 10 300 0ctobe 1， 1962 20 彫

0 Sep七ember1一 1臼62 0 2 5 10 5 10 August2P1962 ㎝ 40

，一 30一

蔭 20’

0 10 2 0 髪 20 5 5 10 Juユy 2， 1962

0 2 10 June 4r 1962 20 10 」L＿、 0 ”1 T 13 10 14 4， 1962 10

l～．・＝一■卜’ 0 May 「 5 12 6，1962 20 Apr■ 10

0 5 40 10 1葺巳rch 7，1962 30

ユo 蹴㌧禰 0 2 3 4 5 6 7 891Ql11213 14 567891011121314 Females and sexually iRdifferenセia七edyoungs Males Sizo groups iロmillimeter8

Fig．45．麗Seasonal罵change of size－composition of O70h63枷ρ1撹θ％sゴsゴ砂o擁oσ．（For female： ■闘ovigerous female；彫females whose ovary is well developed l國females bearing the empty brood pouch）， σσ鋒z卿σ7σ46α％ 14．”zカhづρ04σ o∫渉h6 Sθずo Zπ1σ％づSθσ，1y 329 empty’shells of“Asari”．Sampling in each month was made in the daytime of the new moon or the full moon when the tide・was outgoing，keeping a constant distance from the stone wa11。The specimens were put quickly into the collecting bag by a small elliptical han（1shove1． The length of animals is measure（1from head to telson along the natural curve of the（10rsal line．All the in（1ivi（1uals or a part of the total collection of each month were measure（i an（1sorted into size groups．Seasonal change of size－composition may be seen by comparing one another the results of analyses of the specimens scoope（l by shovel in respective months （Fig．45）。 The individuals Iess than4．5mm long are（le丘ne（l as the sexually in〔1ifferen－ tiated youngs an（1treated together with the female．Adult females examined are classified into three groups accor（1ing to the states，ovigerous，with fully developed ovary，gr with the empty brood、pouch．The number of em－ bryos or youngs within the brood pouch is counted，when the animals are OVlge「ous・ The spawning appears to continue nearly・throughout the year，an（1there－ fore it is （1iHicult to define distinctively each spawning group，but it is

Tab夏e 2． CoHect圭ng data in reference to the investiga亡ion on 亡he biology of O名‘7hεs∫♂σ 卿蜘sづsブ砂o耽σ。 Material examine（i

Date Time Age of W、T． Extracting Total In（1iffer－ Female Male moon （。C） rate entiate（1 4．6～ in（1ays young 6．O mm 4．5mm＞ 6．1mm＜

7／111 12．00 0．7 10．7 1／4 23 80 236 67 6／IV 11。45 1．3 12。0 1／4 7 11 154 40 4／V 11．00 29．3 18．0 1／4 20 2 119 67 68 28 4／VI 10，40 1．6 19，2 1／2 75 3 2／VII 10．30 0．1 21．6 1／2 52 45 37 23 18 2／V皿 11．00 1．6 26．8 1／1 125 64 5 20 1／IX 11．10 2．0 27．2 1／1 6 20 20 1／X 11．50 2，3 24，2 1／1 118 12 63 23 71 1／XI 13．00 3．6 19。9 1／1 48 30 32 12／XII 11．45 14．9 12．9 2／3 12 13 74 47 10／1 11．00 14．2 10．2 1／2 19 37 88 66 25／11 11，50 1。0 6．2 1／3 38 22 65 64

26／III 11、20 0．6 11，0 1／2 1 8 134 44

probable that two active spawnings are seen in the perio（l from spring to early summer an（1in the autumn season from October to November．The spawning season in spring is more prominent than that in autumn，and the total number of spawns is considered to be most abundant in this season throughout the year，although a large number of the newly hatched small specime皿s町e耳ot shown iP the丘gure l this is probably on account of either 330 K。NAGATA

the error of samling or of the operation extracting samples from the total specimens collected．Similar seasonal change of size composition an（1the presence of two main spawning seasons，were also observe（i at another station on the same beach，at a certain（lamp place where the kitchen re・ sidues were pile（i up． Ovigerous females are6．0－6．5mm in length at the minimum．For the extemal appearances of the adult females（irawing towar（1the spawning， the marsupial plates begin to（1evelop at first，in time the ovary comes to mature fully so that the purplish blue mass can be seen through the dorsaI chitinous cuticle of the pereion，at this time the marsupial plates have fairly developed，but not yet arme（1fully with the marginal setae，and then the in（iividuals bearing embryos within the broo（1pouch come to appear．The moulting will be taken just before the issue of mature eggs into the broo（1 pouch，an（1after this moulting the so・calle（1“riding position”will be seen again，followe（i then by a copulative posture imme（1iately before or in the mid（11e of the issue of mature eggs．It is pretty sure that the fertilization takes place outsi（1e the bo（1y。During the breeding perio（1with embryos within the brood pouch，the marsupial plates develop fully an（1are（1ensely arme（l with long marginal setae．After the release of youngs or embryos， the fully（leveloped marsupial plates remain empty for a short perio（l an（1 then fall off in time．Such bree（iing processes are repeated several times by each a（1ult female during the spawning season。Durations for respective processes（e．9．of ri（iing Position，purplish blue state of ovary，of incubation of embryos within the brood pouch，and of retaining the empty pouch），are not ma（1e clear as yet；this re（luires many careful observations in laboratory in future． It is，hereンto be note（1that the purplish blue state of ovary has never be seen from the outside in all of4340vigerous specimens．The mature eggs within the ovaries may all be issued into the brood pouch in a short time． Thus，as shown in the figure，the females（iefine（1as“females whose ovary is well develope（1”always indicate to be in a state prior to the ovigerous stage，an（1“females bearing the empty brood pouch”always in a state after the release of youngs or embryos from the broo（1pouch．The latter is clearly（iistinguishe（1from the former in having m3rsupial plates fully（1evelope（i，but no sign of the purplish blue mass of ovary． The size of mature ova within the ovary is O．32mm－0．43mm in（1iameter． The embryonal stages within the broo（1pouch were provisionally（iivi（led into “eggs”，“me（1ium”，and“advance（1”stages，respectively O．62mm，0．71mm， and O、79mm in diameter on an average．In the“advanced”stage，the appendages of伽e youngs are more or less perceptible through the chorion， an（1the shape is almost ovoi（1，0．83－1．05mm in Ionger diameter。The newly hatche（1young is1．5－2．O mm long， σ4規吻α7ゼ40σ％！41％カhぢカ04σ o∫オh6 S6’o 乃zl4アz4S6α，1y 331

More than50percent of ovigerous females bear5－9embryos within the broo（1pouch respectively，but22at the maximum in a10．7mm long specimen． When a few number of embryos are included within the brood pouch，they are usually consisting of only youngs or embryos of the a（1vance（1stage， while when abun（1ant，all or most of them are the eggs of the earlier stages． An（1it is often met with that embryos in some〔1ifferent stages of（1evelop－ ment are observe（1within the same broo（l pouch．These facts seem to show the possibility that the embryos may hatch or be released from the broo（1 pouch by and by in the or（1er of（1evelopment．On the other hand，however， it is genera11y said in some members of both Isopods an（1Tanai（1aceans that the mmber of the fertilize（1eggs is re（1uced by the expulsion of embryos before their（ievelopment is complete（1（HowEs1939，p．290）．Anyhow，the number of embryos within the broo（1pouch is very variable so far as I examined，an（1no signiHcant correlation coul（1be fom（1between it an（1the season or the size of mother．If the fertilize（1eggs in the brood pouch cou1（i be counte（l exactly soon after the issue from the ovary，there might be foun（1any relatioll between the egg number and some factors． The gammaridean animal is usually sai（1to live on for about a year． The present specimens fully grown up attain nearly to15．O mm long in both sexes．The spawning group seen in March1963is likely to belong to the group hatched in the season April to June1962・Now，taking it into account that the size of the newly hatched specimens is1。5－2．O mm long，the average growth rate per a month may be roughly estimated to be about1。O mm， although the growth rate naturally（1iffers according to the water temperature。 Sex・ratio indicates no positive relation with the season，even though the sPecimens less than6．O mm are excluded。

2．An Observation on the Noctumal Migration of Benthic Gammaridean Amphipods

The noctumal migration of gammaridean amphipo（1s inhabiting the sea floor or among seawee（ls is one of the most interesting phenomena。The object of this observation was丘rst to obtain the general outline of the upwar（l movement at night，and second to（listinguish the species migrating up to the surface waters at night from many benthic amphipo（1s living abun（lantly both in number of individuals and species on the Zo3i6解belt near the low－water mark． It was planned to see successive changes in the number of indivi（iuals at（1ifferent hours of obsesvation from nightfall to（iawn．The result is represente（l graphically in Figure46．The“number of in（iividuals”is re－ presented by the number of gβmmarideans per horizontal haul of a plankton 332 K。NAGATA

132

100 101

65 60 53 48 49 42

27 26 25 20 17 Number 12 of 真ndividualsind 4 0 0 20 0 Time 22．00 24 2 4 6 18 20 22 24 2 4 6 18 20 22 24 2 4 6

ωo ⑦＼H 一＼区 α＼擁 o 卜」臼一ド同一展》へ》四 030J 邸 03国 oo＼図 qつ H ＼ O H O ひつ蒔 σ》〇一箇 o蒔 ω 戯碕＼＼＼＼H ＼＼＼＼＼＼＼＼＼＼N ＼＼＼膏＞＞区擁図図＼Da七ec・Uected≧ 臭肱切く N 図 H H 図＞く図寓図図図図図 N トく図 I 1 巳ト各図 I σ σ‘ σ『 P 即 P Fig・46．Diagram showing the〔1iumal change of number of indivi（1uals of the benthic gammarids per sample ob亡ained by亡he horizontal towing of plankton ne亡圭n the surface waters on Zos卿σbelt near the low．water mark．The soli（1column indicates the proportion of Pσ7擁θ㌶吻駕厩解σ74J to the tQtal sample． net（stretched with GG40，mesh39／inch），towe（1by a retum sailing of a distance of about250meters in the surface water above the Zo吻7σbelt off the Ono－Branc血of o皿laboratory，Onoura，Saeki－gun，Hiroshima Pref。 In the Seto Inlan（i Se3，the ti（ie range is fairly prominent，an（1the ti（1al flow is very fast，particularly in“Seto2’（strait）．This Zo3’67σ一belt is facing Ono Seto，an（i narrowly sprea（is outsi（ie the inlet in the（lirection along the ti（1al且ow l therefore，it is（1esirable to collect at the time when the tid融l flowing is dead．Moreover，the Zos！274－belt is very shallow being about O．5 meter in depth in low water at the spring ti（le．Thus，the collecting was always（ione in the slack water just before the high water，an（i then it was impossible to carry out successive observations in the same（1ay． As seen in Table3，the samples of both series A and C were collected after the moondown，while the series B was taken after the moonrise．No （1istinctive relations，however，could be seen between the migration and the moon light so far as the present collections were conceme（1．In general，the number of indivi（1uals rapi（11y inereases as soon as it becomes completely dark after the nightfa11，reaching to the maximum just before22．00，then Gα吻吻σ7茗4θσn ！1”zカhゼカ04σo！！hθ S6！o 正％1σ％4S6σ，1γ 333

Table3。Data of the observations on the nocturnal migraεion of benthic gammarids．

Age of Moon一 Sun、 Depth W。T． Series Date Time moon rise set rise set in days （m）（。C） 30／VIII 22．05 29．6 5。30 18．55 5．42 18．40 3．5 25。4 6／1× 0．01 7．0 11．51 22．38 5．46 18．31 2．4 24．7 A 9／1x 3．20 10，0 14．41 0。07 5．48 18．26 2，3 25．6 10／IX－a 5．08 11，0 15．36 1．01 5，49 18．25 2．6 24．6 11／IX 5．58 12．0 16．28 2。02 5．50 18．25 2．5 24．2

10／IX－b 18．35 11．0 15．36 1．01 5．49 18．25 3．0 25．4 12／IX 19．35 13。0 17．16 3．07 5．50 18．23 3．0 25．0 14／IX 21。15 15．0 18．42 5．28 5．52 18．20 3．7 25。0 16／IX 22．15． 17．0 20．01 7．50 5．53 18．17 3．2 25．5 B 20／IX 0．30 21．0 22．55 12。19 5，56 18．11 3．0 24．8 21／IX 1．35 22．0 23．45 13．18 5．56 18．10 2。6 24．5 22／IX 2．45 23．0 14．12 5．57 18．08 2．4 25．0 23／IX－a 4。50 24．0 0．39 15．00 5，58 18，07 2．2 25．1 24／IX－a 5．45 25．0 1．34 15．43 5．59 18。05 2．6 25，1

23／IX－b 18．15 24．0 0，39 15．00 5．58 18．07 2．3 25．3 24／IX－b 19．00 25．0 1．34 15．43 5．59 18．05 2．5 25．0 27／IX 20．00 28．0 4，19 17。28 6．01 18．01 3，0 23．8 1／X 21．45 2．3 7．55 19．29 6，04 17．56 3。2 23。4 C 5／X 23．25 6．3 11．37 22．02 6，07 17．51 2．5 22．2 8／X 1．00 9．3 14。17 6．ユ0 17、46 2．1 22．5 9／X 3．00 10．3 15．06 0．48 6．10 17．45 2，1 22．5 10／X 5．15 11．3 15．51 1．54 6．10 17，44 2。6 22．8 gradually decreases towar（is the（1awny an（1animals wholly disappear whil6 the sky is tuming gray before dawn・、The result of series A seems unusuaL Nevertheless，these observations made only in high water of di鉦erent days are consi（1ere（1to accor（l with the（iay of lunar month．The results in（1icateンthus，the number of migrating in（1ividuals increases in the spring tide of the full moon or new moon．Similar phenomenon is also observe（1in the noctumal migration of members of amphipod genusβσ’勿力076宛carried out in the interti（1al waters of Kames Bay，open to the Firth of Cly（ley by WATKIN（1939）．He says there，“when the samples are related to the day of lunar month it is shown that the numbers increase in the ti（1al waters in the perio（1s immediately prece（iing the full moon an（l prece（iing and partly overlapping the new moon。”My results show that the animals stop migrating upwar（1s in the day time，even in the twilight・It is stiII questionable if the numbers always show the maximum at about22。00at night，although this time correspon（1s just to the high water of the new moon or fuII moon as it was so in my observations．In future，the noctumal change of the number of migrating in（1ividuals throughout the same night will be clearly 334 Kl．NAGATA explain（1by further investigations made at the location in a certain much deeper inshore area，deep enough even in the low water of neap ti（1e an（1 without any prominent tidal How in neither spring nor neap tide，which will disturb the towing of plankton net． The total number of in（1ivi（1uals of each species obtained is given below， together with the frequency of occurrences shown by the number of samples for each species：

（Number of individua玉s）（Frequency） Pσ7α4召∬σ卿♂％θ δσ7％7づJ 607 18（al1） Ao70」46300」％郷δ」σ9 45 10 Eプ才o∫ho％づ％3メ膨9，2σ劣 41 11 Co70ψh∫％雑z％62zo∫ 39 6 Sツnoρ毎％」≠7σ別σ7初4 23 7 PO雇og6％θ彪703かσ’¢ 21 7 Co70φh∫％解sp．（juv。） 19 8 βツδκ3ノσψ0初0％S 16 8 POπ渉007σ∫召Sσ1’σ溺07ぢ銘％S 11 8 G舜ση0カ3∫ε初Jo746S 10 4 砿αθプ4sθ77σ渉ゆθ」卿α 8 5 G7‘zπ4躍づ6紹〃‘zノ‘ψo擁oσ 6 5 S≠θ％o渉ho68α〃o鋸ε」3 4 4 ハ4診」露4 勘07θ4％4 4 4 0〆oho”昭％6〃‘z J露≠0741づ3 4 3 Co70ゆh∫％吻‘zohg7z6sJo％卿 4 2 E7Joφゴ36〃σ 360hθ〃6難3♂ε 2 2 盈Z吻sp。（jUV。） 2 2 1σ33σfα」σ吻 2 2 ！1雑z力召JJεoごz”zづhσ〆4（3％εJs 1 1 14070♂4θ3S60％η4σ 1 1 A％zψゴ≠hoθ 」σoθ7∫osσ 1 1 砿比70ゴσ∬σ0％彫δ76n36S 1 1

pσ7σ4θ耀雁％θ枷7郷プ漉occurred most abun（1antly nearly in all samples， showing69．6percent of the total in（iivi（1uals of a11species．It is noticeable that such groups as the burrowing or tubicolous forms often apPear in surface water at night、These facts seem to show that nearly a110f the benthic gammari（1eans act the nocturnal migration。Unfortunatelyンthe pre－ sent observations were made in the season when、the gammari（ieans were rather scarce，an（1so it is very desirable that further investigations will be carrie（10ut in the season when much larger numbers of individuals are available，for instance in spring to early summer． There has been discussions by some authors on the factors causing this noctumal migration，an（1the inHuence of the ti（1e is regar（1e（1as an impor－ tant factor in the ti（1al area．This may be supported also in the present observation by the increase of in（1ivi（lual number in the high tide of the new an（1full moon．The migration may really have something to do with the 0嗣脚磁卿A吻hゆ0440μhθS6’o盈伽4S6σ，1γ 335

bree（iing cycle for each species．Nearly all the in（iivi（1uals obtaine（i were small specimens；further（1etaile（1analyses are needed on the size an（1age compositions and sex－ratio．

3。 A Note on the Comparison of Speeies Composition Between Two Di登erent Areas

Nearly a110f the species（lescribe（1in this paper are foun〔1in relatively shallow waters，from the■03’67σ一belt near low－water mark to about60meters deep l an（i the bottoms of the localities are in most cases compose（10f silt， mu（1，0r sandy mud．Unfortunately，no（letaile（1analyses of the nature of the bottom inhabited by animals have been ma（1e，so that the relations between the animals an（1the important factor，the soil grade，are almost unknown．But there is an interesting difference between the species obtained from Zo惚7σ・belt near low・water mark an（1those collecte（l from the（1eeper area．The‘Zos紛σ・belt near low・water mark，mentioned here is the place where the tide dose not completely go out even in the spring ti（1e an（i about 5meters at the（1eepest place in low－wateL Such a Zos齢σ一belt usually offers a habitat suitable for many young五shes as well as for small crustaceans important as prey－animals。Particularly gammarideans are very rich there in the number of both in（1ividuals an（i species，and occupies60－90percent of small crustaceans on the Zo3’餌一belt of Mihara Bay（NAGATA1960）．The abun（1ant occurrences of gammarideans on the Zo吻7σ一belt is obviously shown also by the stomach contents of五shes caught there（KITAMoRI，NAGATA，and KoBAYAsHI1959）． The species of gammarideans very commonly found on the Zo惚紛belt near low water mark are liste（1below：

1） P47σ4θκα吻％δσ7郷7協 10） Co70ρh♂％鯉zσohθγ％3記％郷 2） PO痂96顔σ70S加如 11） βフ捌3ノ勿o耽％3 3） ∠1〃3ρ鉱hoθ 」α087∫oεσ 12） Eプづoカ∫so〃σ 3θohθ〃6，z3」3 4） z肋z躍ho6副漉 13） PO窺00〆躍θ341砲郷σ7伽％3 5） σ7σ繭伽7θ〃σブ砂o漉oσ 14） 070ho卿θ銘6JJ‘z Jπ≠07σκ3 6） E7fo渉ho％」％s1》％9κσκ 15）。4070毎6300」％励宛θ 7） P伽3’6s力伽oμσ 16）伽7y3！h鰯ノのo％翻s 8） C8吻％3’伽」碗ε 17） Co70ρh’％鯵z z昭πoβ 9） 1433σ毎Jo伽 Of the above－1isted species，species11，12，an（113are foun（i abun（iantly an（i species14－17are fom（10ccasionally also in the area more（ieeper than the Zo惚7σ一belt near low－water mark。While the species140are mostly limited to the Zo3！獺一belt．On the Zo惚7σ一belt of Mihara Bay（Area IV），species1－5 were foun（i very abun（iantly in net－collections，while species6was unexpect－ e（ily rather scarce。The list of the species living very abundantly on the inshore Zo3妙σ・belt is base（i on the materials obtaine（1from Mihara Bay in 336 K．NAGATA

《鎌繋苺’厄瓢 132。E the Seto Inland Sea and near Asa－議銑蹴齢 3 mushi in Mutsu Bay．On the Zo吻74－畿謬讐曝藁罵㍑ belt of the Iatter locality，species1， 3，6－9，and13－16were very rich。 K巳 olド…曙蝿響・よ．．一一蕪 On the other hand， general a－・心義櫨1難 spects of their occurrences in the area（leeper than the Zos’67σ一belt near low－water mark are well represented in Tables4 and5（see also Figs．1 an（147）．The collections in this area were ma（le by drawing a bottom－ layer net（NAGATA1960，fig．1）on the soft sea且oor for1．5－4minutes at each station，but the drawing can never be （10ne un（ier the constant con（1itions throughout the stations an（1therefore the collections are not to be estimate（1quantitatively。How－ ever，several common species wi（1ely distributed in the littoral areas below the level of the low－water mark may 一， 33。300N be clearly shown in the catches of Fig．47．Map showing station localities in these two surveys．More than90 two s皿veys of“Area XI”． Marks O percent of total in（lividuals in each and × indicate respectiVely stations in 1959（Area－a）an（11960（Area－b）．Sts、 catch is occupied by the following 16－22in1960nearly coincide with Sts． 10species：all the7species of Am－ 29－23，and so（10es St．11in1959with pelisCi（1ae， Po漉oo7磁63 σ〃σ駕‘z7魏銘3， Sts，19and26in1960， E7∫01）づs6〃4 s66h8JJ6π3∫s，an（iβσ’h夕卸z6do％ Jo％9初z（z％％3。 Most of them have often been found in the stomach contents of benthos－feeding fishes夕too． J．L．BARNARD starte（1in the opening of his paper of1954b，“Amphipo（1a of the family Ampelisci（iae form an important component of any littoral marine soft－bottom fauna”，an（1this appears to be the fact common to all amphipod faunas of the littoral sea且oor alollg the Japanese coast （ieeper than about 10 meters・ E％〆ツs云h6％3 露初o解z砿！1銘oアz』y∬ 捌g砿鋼o麺o％s，an（l two species of the genus Phoあs have been collected most abundantly at the three stations deeper than10m in Mihara Bay（NAGATA 1960ンfig．2），but not so numerously as expected in the two surveys。 As mentione（1above，a prominent difference in their occurrences was note（l between the species commonly至oun（1in respective areas，but other species occur comparatively less abundantly and less frequently，and thus it is unable to show de且nitely for each species the area of the richest occurrence． 0伽脚磁卿且吻吻・磁・μhθSθ’・Z吻％4S6σ，ル 337

Table4．Species composition at each station・based on the bottom－1ayerロet catches made in the east area of Su6Nada（Area XI－a）in the perio（1June12－16，1959。 Total：5673specimens．Depth：32－56m、（see Figs。1an（147），

1 2 3 4 5 6 7 8 9 10 13 14 S七醜ion No． ll 12 Toもal ㎞elisca brevicornis 212 318 334 230 150 19 120 8 30 128 196 1り7 136 1 9 2117 Ponもocrates al a皿巳r■nUS 106 ユ27 96 28 37 79 150 22 129 30 41 26 64 56 991 Erio isella secheUensis 29 29 38 17 24 38 138 22 31 59 39 17 8 39 528 Byblis Oa on↓cus 4 14 35 lQ5 12 80 86 115 451 B的h edo皿10nρimanus 31 7 26 47 49 24 36 48 5 5 9 3 33 ムmpelisca naikaie照is 7 41 63 33 42 44 79 3 9 ムm elisca bocki 1 1 79 1 45 1 22 37 79 2 1 269 曲elisca miharaensis 9 24 15 11 20 20 33 132 ム皿elisca misa甑iensis 1 37 10 8 2 8 28 33 127 Photis lon icaudatα 3 3 1↓ 53 ？ 29 106 Phoもis rein虹ardi 1 42 9 7 59 恥ry3theus utinomii 2 1 11 9 17 9 1 6 56 Melphiαippa globosa 1 2 4 3 3 9 4 3 5 4 7 45 Liljebo gia japonica 1 2 2 6 4 5 11 1 1 33 20 Coro hium ueno■ 1 3 2 14 Melit5tubercula｛》a 1 3 5 1 3 1 1 15 Idmella curvidactyla 1 2 4 2 1 1 1 2 14 Mel hidi a borealis 3 1 1 4 11 1』i1●ebor ia serrata 1 2 1 3 3 10 Coro hiidae undet．sp （B）工 1 5 ？加pelisca cyclops 5 1 6 Ceradocus capens■s 5 5 Maer＆serraもipalma 4 4 北rlsもi＆8pacificus ヱ 4 Idunella chilkensis 2 1 3 Coro hium k主tamorli 2 1 3 Ar issa hamatipes 1 2 3 Le tam hopus n・vaezealandiae 3 3 Orchomenella litしoralis 2 ・2 Mel hidi ella silmata 2 2 Melphisana japonica 2 2 Podoceropsis nitlda 1 1 2 勘devoura mirabiユis 1 1 11arpinia miharaensis 1 ］ Eurystぬeus japomcus 1 1 Podocerus■nconsp■cuus 1 】 QO ωoO

Table 5・Spec圭esc・mp・siti・nateachstati・n，based・ntheb・tt・m・1ayer、netcatchesmadeintheeastarea・fSu6Nada （Area XI－b）in the perio〔1Sept．2－5，1960． Tota里：3689Specimens．Dept血：10－56m．（see Figs。1and47）．

St巳tion Ko． Species 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ユ6 17 18 19 20 21 22 23 24 25 26 27 28 29 Toもa1 蝕e■SC e・r com’β 4 23 103 306 127 10 ．65 237 123 29 3 117 17 95 22 54 147 3 101 24 3 23 1 95 61 162 Ampe1■sca oc真 6 ユ9 1 19 1 6 15 09 14 37 63 49 67 26 1 9 14 1 17 428 藤鍵・r‘の 4 1 9 64 45 6 3 20 38 11 ワ3 11 5 1 6 1 16 275 blis ・巳ouicus 3 28 12 51 45 8 15 301 34 1 1 2 4 22 G 1 263 PDntocrate8a1もa疏ari継3 3 ユ 14 9 4 4 7 4 1 14 7 5 2 25 9 13 1 11 8 1 工1 1 7 1 163 蜘 elユsca naikaien5i3 1 3 工 2 4 15 9 1 27 31 1 3 2 7 7 2り窪 141 ．㎞ elisca瓢ih邸＆ensis 1 1 4 工 2 2（） 2 3 4 R 6 4 83 E1一io isell巳sechellensi8 3 3 7 1 1 3 1 1 1 2 1 2 1 1 1 1 3 35 蜘eliβc＆c而clo s 15 7 8 31 Bat五、弓nedon lon imams 3 9 3 1 16 伽1hidi a 工obo鵠 1 5 2 1 9 Photis lon lcaudata 1 1 2 3 1 9 唇 Mel hiai ella sinuat巳」 2 1 3 1 8 Unciolella lu且＆t巳 6 2 8 5 1 6 2 OrchomeneU＆1ittor㊧1is ＞ Meαaluropu3agih8 5 5 o Photis reinhardi 1 2 2 5 》 Coro hium cra88ユcorne 5 → d v m s ワ 1 1 4 ＞ 3 1 4 恥r stheUS ’a on1CUβ 1 2 3 Eu1・8theus utinomii つ 1 3 翫icthORius u n巳X 3 3 Sco elσcめeirus ho eユ 1 1 2 Ln’ebor エ巳serrata 1 1 2 Maeraβe”巳ti alma り 2 M巳erella te4ui皿昆ロ巳 2 2 Podoceropsis nit1己巳】 1 9 Gra瓜didierella 巳oロ■ca 9 Par巳hOXU3 0cula加5 〕 1 Har inia mihamens13 1 Anon・Xロu ax 巳cifiCUS 1 1 Leucotヒoe｛“c18巳 1 1 Liljeborgi巳japonica 1 1 Idunella chilken8is 1 1 ㎝ a onica 1 Aoroides co1㎜blae 1 Cσ”z”zσ7」46σ％ 14”zρh∫カ04σ o∫云hθ So’o Znlσ％4Sθα，11V 339

4．Gammaridean Amphipods as Prey－animals，with Special Relation to the Triglid Fishes Caught in t】hしe Seto I］nlland Sea

As previously mentione（l again and again，amphipods are important prey－ animals often fom（1abundantly in the stomach contents of many benthos－ feeding fishes．To make clear the trophic relations between higher consumers an（l their preys，our laboratory carrie（l out the collecting of benthic fishes by the experimental two－boat trawler（30tons＆80H．P．），which ha（l eight cruises over eleven“Nada”一areas aroun（i the coast of Sh蓋koku in the perio（1 from Sept．1957to Sept．1960an（10btained enormous catches of benthic Hshes。 And I have ha（l an opportunity to gbserve the stomach contents of nearly all of the benthic fishesンbut piscivorous fishes an（1Plankton fee（lers． For an example，a qu＆litative analysis of their feeding frequency by food－group of the飴hes caught during the fourth cruise made in May・June 1958is given in Table6。Here，the fee（1ing frequency is shown by the percentage of the number of五sh fee（iing on a respective foo（i－group to the total number of the Hsh examined．丁血e total number of丘shes examined 血ere3mounts to2880indivi（1uals，including75species，but in this table， only the results for 31 species are given，the species represente（1by less than10indivi（iuals being omitte（1．As seen on this table，main foo（1items of those b3nthic 丘shes except for piscivors in the Seto Inland Sea are shrimpsシsmall crus重aceans，annelids，an（1fishes；alぬough the proportions of these foo（i animals are differen．t with fee（1ers，nearly all of fishes are known to show a fairly high percentage of shrimps in the stomach contents。Fishes or squids which all the feeders Iisted in this table preyed upon are small in size an（i not so signiHcant quantitatively so far as conceme（1with those found in the Seto Inland Sea．Strictly saying，all the values in the table may be swaye（1to some extent by the number of fee（1ing individuals examine（i， variation of their size，and also by the seasonal change of prey－animals themselves；although they may be available to get the general view of the food organisms of the Hshes． Relatively high percentages of small crustaceans are seen in flatfishes and triglid ones。Especially it is noteworthy that unexpecte（11y large amount of small crustaceans including gammaridean amphipo（ls are eaten by the latter．Particularly as to Lゆ40≠万gJ4雁070がθ7σ，a large number of indivi（1uals were examined so that the above－mentione（l tren（1seems to be unsuspecting． It is suppose（l that trigli（1Hshes bear some resemblance to Hat丘shes in their fee（1ing habits．In feeding they usually lie prostrate on the bottom an（1feel the sea且oor by means of their long finger－like pectoral filaments． Of course少like other fee（1ers，trigli（i Hshes show some changes in the composition of foo（1animals with growth．Table7shows the percentage of 340 K。NAGATA

Table6． Feeding fre（1uency of the benthic fishes caught during May－June1958，by food－group．

（ bβ i… 目り 9【）て， q 邸の＼ Food group Φ ＋ゆ Φの o 自一名罵昭おの β悶一旧℃・一｝ o写日昆墓馨 o 秘・一帽妻 O Q ℃ o ℃ ①℃図 q Fee〔1ing fish 讐§・ヨ①渥暮量黄魏鷲暮著餌客国の ω Q の ω ＜嵩国 P

Trigli（1ae Lepidotrigla abyssalis・ 8－15 11 973 64 18－ L， guntheri 9－21 12 － 83 － 8 17－ L．japonica 8－19 30 － 20 80 7 57 10 7 L．microptera 7－30 287 2 7 89 1 39 7 3 2 L． kishinouyei 14－24 37 － 3 100 － 27 － 3 Pachytrigla alata 11－22 15 7 － 94 7 FlatHshes Laeops Ianceolata 8－13 41 100－ Areliscus sp． 12－17 31 3 90－ 16 Poecilopsetta plinthus 6－11 22 73 64－ 9 Pleuronichthys cornutus 9－17 20 5 5 75 5 25 Limanda yokohamae 14－21 19 32 26 6316 32 Areliscus interruptus －6－10 39 5 21 54－ 28 Psettina ij圭mai 5－8 115 2 2 1 96 45－ Scidorhombus palli（ius 5－6 13 23 92 8一 Eopsetta grigorjewi 12－19 41 2 61 7 44 Arnoglossus japonicus 7－10 57 14 60 74 Pseudorhombus pentophthalmus 6－13 100 25 6 44 1 47 2一 Sparidae Chrysophrysmajor 12－35 16 69 6 25 Branchiostegi（1ae Branchiostegus spP。＊ 11－32 55 29 6 33 4 16 22 － 4 11 Nemipter三dae NemipterUS SPP．＊＊ 9－47 39 41 3 56 18 5 10一 Sciaenidae Argyrosomus argentatus 9－23 274 37 68 12 1一 7 P二atycephali（lae Kumococ加s detrusus 14－26 22 27 59 5 5 5 Suggrundus meer（1ervoorti 14－23 32 25 － 91 一一 3 Cocie11a crocodila 20－44 18 33 6 50 28 33 一 6 Lamnina Mustelus griseus 42－85 11 27 55 36 18 9 M．manazo 40－77 63 16 81 41 11 6 Rajina＊＊＊ Holorhinus tobijei 13－35 28 － 82 －一一75 Raja kenojei 9－24 58 14 86 3 2 一一 5 Dasyatis akajei 15－32 27 30 85 4 7 4一 4

＊）Comprising two speciesβ。α796撹4魏3an（1β．ブ勿o廊o麗sブ砂o勉c％3，＊＊）Comprising two speciesムτ，∂〃9諺％s and／V，δ碗hψ％ε。＊＊＊〉Measured by‘Body Length㍉ Gσ解z％zα7づ46σ銘ノ1”zカhゼカ04α o∫≠h6 S6ずo ∫％1σ銘4S6σ，1γ 341

Table 7・ Feed正ng fre（luency of L67露40ず〆’gZ4 彿Jo70汐」6〆4 caugぬt during Juneユ959，by size an（1by foo（i・group， T．L（mm）＜120 ＜160 〈200 ＜240 く280 ＜320 Tota1 Number of fee（1ing 1 12 103 69 35 5 225 in（1ividuals Fish 3．8 5．7 11．4 5，3

Squi（l 5，8 2．9 2．9 4．0 Large shrimp 41．6 43．6 50．7 71．4 80．0 50．6 Small shrimp 100。0 66．6 56．3 55．0 71。4 40．0 58．6 『Crab 0，9 0．4 Amphipo（i 75．0 43。6 26．0 22．8 20．0 36．0 Cumacean 1．9 0．9

Polychaete 16．7 4．9 2．9 5．7 4．9 Molluscan 3．9 2．9 5．7 3．6 the feeding frequency by food・group and by size in Lθカぢ40渉7づgJα彫診070汐彪7σ caught during the cruise in June1959。With the increase in size，the percent－ ages of large shrimps an（i五shes grow higher，while those of small shrimps an（1amphipods gradually decrease．Small crustaceans were represented by only two groups of gammari〔1ean amphipo（1s and cumaceans．

Table8． Feeding frequency of tr圭glid 丘shes caugh亡during Sept、1957to July－Aug、19581 by season an（l by food－grQup， Sept， Dec． Jan．一Feb． May－June July－Aug． 757 ’57 ’58 258 ア58

Fish 5，5 11．0 2．9 1．8 9。1

Squid 6．3 1．3 7．3 2、5 Shrimp 70．8 91．9 80．9 87．9 84．4 Crab 3．3 2．3 10．3 1．5 3．6

Stomatopod 1．4 3．9 1．5 0、4 Small crustacean 19．6 13．3 19．1 37．1 13．8 Polychaete 1．4 6．1 6．6 1．8

Mo11uscan 0．3 6．1 3，0 Echinoderm 0．3 0、4

Others 1．0 O．5 Undet．contents 7．2 2．9 2．3 8．7 Numbers of feeding 363 235 53 396 275 in（iivi（1uals

On the other han（1，the feeding frequency of trigli（1丘shes caught in the period from Sept．1957to July－Aug．1958，by season an（i by food－group，is shown in Table8．The feeding frequency for shrimps was highest through－ out，an（1th＆t of small crustaceans was always relatively higher than those of other prey－groups excepting shrimps．Figure48shows the seasonal change of the fee（1ing frequency for small crustaceans given in Table8，together With that for gamm㊧ri¢ean amphipo（ls e＆ten by varigu呂茸s耳es livin呂on th¢ 342 K。NAGATA

801 Zoε≠¢郷一belt of Mihara Bay（KITAMoRI， NAGATA et KoBAYAsHI1959，fig．8）。

切 Amphipods are the largest component 60 of small crustaceans found in the stomach of trigli（1盒shes treated in

か 40 Table8，an（l therefore it is very 蕃昌 interesting that the two curves shown in Flgure48indicate a similar ten（1． q 20 ency； one refers to the offshore 角 areas，while the other concems the inshore region near the low－water 10 12 り 4 6 a 10 Month mark．Resultsofmanysurveysin Mihara Bay indicate that the seasonal Fig。48。 The seasonal change of the fee（1ing frequency for small crustaceans（一・）an（1 change of the fee（iing frequency for for gammaridean amphipods（一），The gammari（1ean amphipods agrees fair－ dotted Iine refers to that of trigli（1丘shes 1y well with the seasonal variation given in Table8，while the soli〔11ine concerns that of the various fishes living in the quantity of the amphipo（ls on the Zo3惚74belt near the low．water themselves in that habitat。And this mark in Mihara Bay． means nothing but that triglid丘shes in the Seto Inlan（1Sea fee（1relatively well on small crustaceans。 Now throughout the五ve－month（1ata shown in Table8，the percentage composition of the total small crustaceans found in the stomach contents of triglid fishes is given as follows＝

Amphipo（1a Gammari（1ea 54．1 Caprellidea 5．4 Cumacea 24．4 Ostracoda 9．6 Mysidacea 5，6 Brachy皿a＆Macrura larvae 5．6 Isopoda 0．09 Nebaliacea 0，09

More than half of small crustaceans consist of gammaridean amphipods， of which several（10minant species are given below together with the per・ Centage COmpOSitiOn：

丑卿力6κSO4西7θ颪007痂s A卿φθJJsOσoyoJoφ3 A卿ψ召κSOσδ00葱 23．2 且仰ψ6κ30σ甥歪sσゑ犯πεJs

∠L”zカθ」づsoσ ”z∫hσ7σθπs∫3 A卿θ」∫scσ痂鰯θηs∫s βyδ」彦3／4カ0短0％S 17．5 PO％≠0074’θSσκσ郷σ7ゼη％3 11．7 G伽灘磁θ伽A吻hゆ04α・μhθS・∫・五吻％4S6α，1γ 343

E％7ysオhθ％s％ガπo”zづづ 37．5 E％7ン3≠hθ％3ノσ1）o箆♂c％ε ｝ Phoガε Joκ96αzπ磁渉σ 0，3 Phoあs 7θJhα〆4づ｝

L露ノθδ07g彪ゴ4ρ0吻0σ 0．4

PO400θプ％S勉σ0ηSカゴ0％％3 3．4 0ther species 5．9

It is seen that 89．9percent of the total are卜occupie（1 by IO species of the genera4別力9傭oα，B夕δ傭，Po窺067躍6ε，and E％7y3！h6％s．The conjecture that these species important as prey陶animals must be inhabiting abun（1antly on the・offshore floor is supporte（1actually by two benthos－collections shown in Tables4a耳d5，namely the above10species account for78。6percent of the total indivi（iuals in Area XI－a（Table4）and for96．2percent in Area XI－b （Table5）．

REEERENCES

ALDERMAN，A．L．1936．Some new and little known amphipods of Califomia。Univ、Calif． Publ．Zool。，41（7）：53－74，51text，figs． BARNARD，」．L．1952．Some Amphipoda from Central Califomia・Wasmann Jour・B圭01・，10 （1）：9－36，9Pls． 1954．A new species of1協070ノαs3σ（Amphipoda）from Los Angeles Harbor．BulL So．CaIf．Acad．Sci．，53（3）：127－130，pls．35－36． 1954a．Marine Amphipoda of Oregon，Oregon State Monog・，ZooL・8：1－103，pls．1－33。 1954b。Amphipoda of the family Ampeliscidae collected in the eastem Pacific Ocean by the Velero III an（1Velero IV． AIlan Hancock Pacific Expeds。，18（1）こ1－137，pls．1－38， 1955．Gammaridean Amphipo〔1a（Crustacea）圭n the collections of Bishop Museum． BishoR Mus・，Bu11・215：1－46，text－figs・1－20・ 1958．Index to the families艶genera，and species of the gammaridean Amphipo（ia・ Allan H参ncock Found。，Occ，Pap，No．19：1－148， 1959．The number of species of gammaridean Amphipo（1a （Crustacea）．BuIL So． Calif，Acad．Sci．，58（1），p，16． 1959a．Liljeborgiid amphipods of Southem Califomia coastal bottoms，with a revision of the family． Paci丘c Natura玉ist，1（4）：12－28，text一丘gs。1－12，1tab．，2charts。 1959b．Generic partition in the amphipod family Cheluri（1ae，marine woo（1borers、 Ibi〔i．，1 （3）：1－12，text、figs，1－5、 1959c。Ecology of Amphipoda an（1Polychaeta of Newport Bay，Califomia，Allan Hancock Found．Publ．，Occ．Pap．No．21：1－106，Pls，1－14． 1960．Common pleustid amphipo〔1s of Southem Califomia7with a projected rev圭sion of the family．Paci丘c Nat皿alist，1（17）：3748，6text－figs。 1960a．The amphipod family Phoxocephalidae in the eastem Pacific Ocean，with analyses of other species and notes for a revision of the｛amily、Allan Hancock Paci丘c Expe（1s，，18 （3）；169－375，pls。1－75y14tabs、，1 chart・ 1961・Gammaridean Amphipoda from（1epths of400to60000meters in scientific re・ sults of the Danish Deep・Sea Expedition round the world1950－52。Galathea Report，voL5： 23－128艶text－figs．1－83，8 tabs・ 1962．Benthic marine Amphipoda of Southem California：families Amphilochidae， Leucothidae，Stenothoi（1ae艶Argissidae，Hyali（1ae， Paci丘c Naturalist，3（3）：116－163，text一丘gs． 1－23，1 table， 344 K．NAGATA

1962a．Benthic marine Amphipo（ia of Southem Califomia：families Tironidae to Gammaridae・Ibid・ン3（2）：73－115，text－figs・1－23，2tables・ 1962b・Benthic marine Amphipoda of Southem Califomia：families Aoridae Photi（1ae・ Ischyroceridae，Corophiidae，Po（10ceri（1ae． Ibi〔i．，3 （1）＝3－72，text・figs．1－32。 BARNARD，K．H．1916， Contributions to the crustacean fauna of South Africa． 5．一The Amphipo（1a，Ann．So．African Mus．，15（3）：105－302，pls．26－28． 1925．Contributions to the crustacean fauna of South Africa－No．8．Further ad（1i－ tions to the list of Amphipoda．Am．Soc・African Mus，，20（5）：319－380，pL34・ 1930．Amphipoda．British Antarctic（“Terra Nova”）Expe（1itionン1910，London。Nat． Hist。Repts．，ZooL，8：307－454，63text－figs。 1932．Amphipo（ia．Discovery Repts．，5：1－326，p1．1，174text－figs． 1935．Report on some Amphipoda，Isopoda，an（1Tanai（1acea in the collections of the Indian Museum．Rec．Indian Mus．，37；279－319，21text－Hgs． 1937，Amphipo（1a．John Murray Exped．1933－34，Sci．Repts．Brit．Mus．（Nat．Hist．）， 4 （6）：131－201，21 五gs． 1940．Contributions to the crustacean fauna of South Africa艶XII．Further ad（1itions to the Tanaidacea，Isopoda，and Amphipoda，together with keys for the identification of the hitherto recorde（1marine and fresh。water species．Ann．So．African Mus．，32（5）；381－543， 35text－figs． 1955。Additions to the fauna－1ist of South African Cmstacea an（I Pycnogonida・Ann・ So，African Musり、43（1）：80－99，text一五gs．38－49（Amphipoda）． BuLYcHEvA，A．1、1952．Novye vi（iy bokoplavov（Amphipoda，Gammaridea）iz Japonskogo Morja．Aka（i，Nauk SSSR，Trudy Zool．Inst．，12：195－250，39五gs． 1955．Novye vidy bokoplavov（Amphipoda，Gammaridea）iz Japonskogo Morja・II・ Ibid．，21：193－207，6text．五gs． CHEvREux，E．1900．Amphipo（1es provenant（1es campagnes de J7捌70雁θ〃θ（1885－1888）．Res． Camp．Sci．Albert Ier，Monaco，16：トIV，1－195，pls．1－18． 1901．Amphipodes。Mission Scienti五que．．＿。Alluaud aux Iles S6chelles．Soc。ZooL France，M6m。，14＝388－438，65text。Hgs．一 1907、Amphipodes recueillis dans＿＿1’Oceanie par M．Seurat．Ibid．，20（4）：470－ 527，35text，figs， 1908・Sur trois nouveaux amphipo（les m6（1iterran6ens appartenant au genre Co70ρh伽形 Latrdlle． Bu1L Soc．Zoo1．France，33二69－76，6text－figs． 1911。Campagnes de la1吻」吻．Les amphipo（1es d’Alg6rie et de la Tunisie，M6m。 Soc・Zool・，France・23 （3）：145－275，pls．6－20，17text・figs． CHEvREuxy E and L FAGE。1925．Amphipodes。Faune（1e France，9：1－448，438text一丘gs， CHILToN，C。1911． The Crustacea of the Kermadec Islands． Trans．N．Z。Inst．，43：544－573， 4text・figs． 1920。Some New Zealand Amphipoda：No．1，Ibid．，52；1－8，5text一丘gs． 1921。Report on the Amphipoda obtained by the F．1。S．“Endeavour”in Australian Seas， BioL Res．“Endeavour”，5（2）：33－92，16text－figs． 1921a．Fauna of the Chika Lake．Amphipoda，Mem．Indian Mus．，5：519－558，12 text・丘9S． 1925。Zoological results of a tour in the Far East．The Amphipoda of Tale Sap． Mem．Asiat，Soc。Benga1，6：531－539，3text・figs。 CRAwFoRD，G．1．1937，A review of the amphipod genus Co70助彪郷，with notes on the British specie＄・Joum・Mar・BioL Assoc・United King（10m，21（2）：589－630，4text一丘gs・ DAHL，E・1944・Amphipoda of the family Ampelisci（1ae from Professor Sixten Bock’s Expedi・ tion to Japan，1914。Arkiv f6r ZooL，36A（1）：1－18，10text．五gs。 1959．Amphipo（1a from（iepths exceeding6000meters．Galathea Rep．，1：211－241， 18figs。 G側灘瑠θ傭／1卿吻04σoμhθS6♂〇五吻n4S召召，1y 345

DELLA VALLE，A。1893．Gammarini del Golfo di NapoIi．Fauna und Flora（ies Golfes von Neapel，20：xi plus948pp．，61 pls． DuNBAR，M・J・1954・The amphipod Crustacea of Ungava Bay，Canadian Eastem Arctic． Joum。Fish。Res。Boar（1Canada，11（6）：709－798，42text－f｝gs．，1table。 ENEQu工sT，P．1949。Studies on the soft－bottom amphipods of the Skagerrak．ZooL Bidrag，fran Uppsala，28：297－492，67text・figs．，6charts． GuRJANovA，E195L BokoPlavi morei SSSR i sopre〔1ernyx vod （Amphipoda・Gammaridea）． Opred．po Faune SSSR，Izd．Zool．Inst，Akad，Nauk，41：1－1031，705丘gs． 1962． Bokoplavi severnoj chasti Tikhogo Okeana、 Opred．po Faune SSSR，Iz（1、ZooL Inst．Akad，Nauk，74：1－441シ143text一昼gs． HowEs，N．H．1939，0bservations on the biology an（1post－embryonic development of五40’θσ 加7溜ε（Slabber）（lsopQda，Valvifera）from New Englan（1Creek，South－East Essex．Joum， Mar．BioL Assoc。United King（lom，231279－310，14figs，，2tables， HuRLEY，D．E．1954． Stu（iies on the New Zealand amphipodan fauna． No。9， The families Acanthonotozomati〔1ae，Pardaliscidae and Lilleborgiidae．Trans．Roy．Soc。N．Z．，82（3）；763－ 802，14text・figs． 1954a．Studies on the New Zealand amphipodan fama．No．7，The family Corophi－ idae，including a new species of Pσ7σoo70ρhゴ％郷． Ibid，，82（2）；431－460ン7text一丘gs， 1957。Stu（lies on the New Zealand amphipo（1an fauna．No，14．The genera Hyale an（1 Allorchestes（family Talitridae）。Ibi（1り84（4）；903－933，9text－figs， IRエE，H．1956．Tube－building amphipods occurring at the“wakame”（a species of brown algae： U％伽7毎が彫碗炉4σ）grounds of Simabara，Nagasaki Prefecture．Bull。Fac。Fish．，Nagasak量 Univ。，4；1－6，6丘gs。 1959，Studies on pelagic amphipods in the adjacent seas of Japan。Ibidり8＝2042， 4且gs．，11 tables． IwAsA，M．1934．A new amphipod（Pσ7hyσ」θ肋7〃θ顔3・n・sp・）from Urup・Joum・Fac・Sci・ Hokkaido Imp．Univ．，ser．6，ZooL，3（1）31－7，pls，1－2。 1939．Japanese Talitridae． Ibi（1．，ser。6，Zoo1．，6（4）：255－2967pls．9－22，27text．figs． KエTAMoRエ，R．，K．NAGATA，and S．KoBAYAsHエ．1959． The ecological study on“Moba”（Zone of Zo3！67σ彫47初4L．）．（II） Seasonal changes・ BulL Naikai Reg・Fish・Res・Lab・・12：187－ 199，13figs．，2tables・（ln Japanese）・ NAGATA，K．1959．Notes on five species of the amphipod genus A卿力θ」6sσαfrom the stomach contents o｛the triglid丘shes。 PubL Seto Mar。BioL Labり7（2）：263－278，11text－figs。 1960．Preliminary notes on benthic gammaridean Amphipoda from the Zo吻7σregion of Mihara Bay，Seto Inland Sea，Japan． Ibi（i．，8（1）：163－182，pls。13－17，2text－figs， 1961．A new atyli（1amphipo（1from Japan。Annot．ZooL Japonり34（4）；216－218，2

text・figS。 1961a。Two new amphipods of the genus E％7ッsオh6％s from Japan。PubL Seto Mar， BioL Lab．，9（1）；31－3672text．flgs． OLlvEIRA，L．P．H．ユ953．Crustacea Amphipoda do Rio de Janeiro・Mem・Inst・Oswal（10Cruz・ 51：289－376，27text．figs． PIRLoT，J．M．1936．Les amphipodes de rexp6dition du Siboga・Siboga－ExpedりMon・33e； 237－328，text一五gs．101－146、 1938．Les amphipo〔1es de l’exp6dition du Siboga。Siboga・Expe（1．，Mon．33f；329－359，

text．figs。147－161。 REエD，D。M．1951，Report oll the Amphipoda（Gammari（1ea and Caprelli（1ea）of the coast of tropical West Africa。Atlantide RptりCopenhagen，2：189－291，58text．丘gs， RuFFo，S．1950．Studi sui crostacei Anfipo（ii．XXII－Anfiipodi der Venezuela raccolti（1al G． Marcuzzi．Mem，Mus。Civ．Stor．Nat・Verona，2（2）；49－65・5text・Hgs・ 1959． Contributions to the knowledge of the Red Sea・ No・13・ BulL Sea F圭sh。Res。 Stat．，Haifa，20：1－26，6text．Hgs． 346 K．NAGATA

SARs，G．0。1895．Amphipoda．An accomt of the Crustacea of Norway with short descrip・ tions and figures of all the species，1；i－viii，1－711，240pls，，8 suppL pls， ScHELLENBERG，A．1926． Die Gammariden der Deutschen S苞dpolar－Expedition 1901－03・ Deutsche SU（ipolar－ExpedりBerl圭n，18：235－414，68text－figs。 1926a．Die Gammariden der Deutschen Tiefsee－Expedition．Wiss．Erg．D．TielseeExp。 “Valdivia”，23（5）；195－243，28text－figs、，pL5． 1927．Amphipoda des nordischen Plankton．Nordisches Plankton，20（6）：589－722， 104text－figs． 1928．Amphipo（1a碗Cambridge Expe（1ition to Suez CanaL Trans。Zool．Soc．London， 22：633－692，12text．figs．＿ 1931．Gammari（ien un（1Capre三li（1en（1es Magellangebietes，Sudgeorigens m（1（1er Westantarktis．Further Zool．Res．Swedish Antarctic Exped，1901－03，2（6）11－290，1pL， 136text一丘gs． 1936．Zwei Neue Amphipoden（ies Stillen Ozeans un（1zwei Berichtigungen。Zool． Anz．，116：153－156，1text一丘g． 1937．Schlussel und Diagnosen（1er（iem Susswasser．Gammarus nahestehenden Ein－ heiten ausschliesslich der Arten（1es Baikalsees und Australiens．Ibi（i。，117：267－280，4 text－agS， 1938．Litorale Amphipoden des tropischen Pazifiks．KgL Svenskapsakad。Han（11り（3） 16 （6）：1－105，48text一五gs． 1942，Krebstiere o〔ier Crustacea IV：Flohkrebse oder Amphipo〔1a．Die Tierwelt Deutschlands，Jena，40：1－252，204text．figs， SExToN，E，W。＆D．M．REID195L The life－history of the multiform species1σs34fθJo蜘（Montagu）（Crustacea Amphipoda）with a review of the bibliography of the species。Linn． Soc．Lon〔10n，Jour．（ZooL），42 （283）：29－91，pls、4－30、 SHEARD，K。1938．The amphipo（1genera E％oπ銘，S甥46辮痂紹and勘7認θ∬4厩鰐．Rec．So． Austr．Mus．，6（2）：169－186，9text．丘gs． 1939．Stu（1ies in Australian Gammaridea・（1）The genus Cθ7α400％3．Ibid．，6（3）： 275－295，8text．血gs。 SHIINo，S．1948．Stu（1ies on marine crustaceans IIL On a new boring amphipo（i，Ch6伽解 δ76痂側伽，sp．n．Misc・Rept・Res・Inst・Nat・Resources・12：25－28βtext・丘gs．（ln Japanese）． SHoEMAKER，C．R．1930．The Amph量poda of the Cheticamp Expedition of1917．Cont。Canad． Biol．Fish．，5（10）：221－359，54text－figs， 1933．Two new genera an（1six new species of Amphipo（la from Tortugas． Carnegie Inst．Wash Pap．Tortugas Lab。，28：245－256，8text－figs． 1942， Amph圭poda crustaceans collected on the Presidental cruise of1938．Smithson． Misc． Coll．， 101 （11）：1－52，17text．figs， 1945， The amphipod genus Phoガ30n the east coast of North America．Charleston Mus．Leaf1．， 22；1－17，5text－figs． 1947． Further notes on the amphipod genus Coプoヵh伽卿from the east coast of America。 Joum．Wash． Acad，Sci．，37（2）：47－63，12text－figs． 1949． The amphipo（1genus Co70ヵh勉彫on the west coast of America，Ibid、，39（2）： 66－82，8text－figs． 1955．Amphipoda collected at the Arctic Laboratory，Omce of Naval Research，point Barrow，Alaskap by G。E．MacGinitie。Smithson．Misc。Colls、，128（1）：1－78，20text．五gs， 1956、Observation on the amphipod genus P4〆hッσ」θ．Proc，U．S、Nat．Mus．7106（3372）： 345－358，4figg． STEBBNG，T．R．R。1888．Amphipoda。Rept。“Challenger”Exped．，Zoo1．，vo1，29， 1897。Amphipoda from Copenhagen Museum and other so皿ces．Trans．Lim．Soc． Lon（10n，（2），Zool．，7：25－45，pls．6－14． 0α”z”z‘z7」40σ1z 1∈”4》h歪力oゴα o．プ≠hθ S6♂o Z翅」‘z％4S6α，1V「 347

1899。Amphipoda from Copenhagen Museum an（i other sources．Paτt2，Ibid．，7： 395－432，pls，30－35． 1906。Amphipo〔1a I．Gammar圭dea．Das Tierreich，21：1－806，127text・figs． 1910．Crustacea，Part5。Amphipoda．Sci．Res．TrawIing Expe（i．H．M．C．S．“Thetis”． Mem．Austr．Mus，，4，voL2，（12）：565－658，pls．47－60． STEBBING，T．R．R．＆D。RoBERTsoN1891．On four new British Amphipo〔1a．Trans，ZooL Soc。 Lon〔10n，13；31－42，pls．5－6， STEpHENsEN，K。1915，Isopoda，Tanai（iacea，Cumacea，Amphipoda（exc1。Hyperi（iea），1κReport of the Danish Oceanographical Expe〔1ition，1908－10，to the Me（literranean an（i adiacent seas． voL2，Biology，D，1：1－53，33text－figs， 1923．Crustacea Malacostraca．V（Amphipoda工）．The Danish Ingolf．Expedition，3 （8）：1－100，22text－figs．，charts． 1925．Crustacea Malacostraca．VI（Amphipoda II），Ibid。，3（9）：101－178，text，丘gs， 23－53，charts． 1932，Some new amphipods from Japan．Annot．ZooL Japon。，13（5）＝487－501，5 text・丘9S。 1933．Co初吻σノのo初oσ（n．gen．，n．sp。），a new aberrant species of the amphipodan family Talitri（lae from Japan．Trans．Sapporo Nat．Eist。Soc．ナ13（2）：63－68、 1935． In（10．pacific terrestrial Talitridae． Bemice P．Bishop Mus。，Occas，Papり10（23）： 1－20，2tables． 1938．G7σ4躍’67θJJ4ノ砂o吻oσn．sp。，a new amphipod with stridulating（2）organs from brackish water in Japan．Annot．Zoo1．Japon．，17（2）；179～184，2text－figs、 1938a．The Amphipoda of N．Norway and Spitsbergen with adjacent waters、Troms6 Mus．Skrifter，3 （2）：141－278，text・figs．20－31， 1940．Marine Amphipoda．The Zoo王ogy of Iceland，3（26）＝1－111，13text一猛gs，，2 tables． 1940a．The Amphipo〔1a of N．Norway and Spitsbergen with adlacent waters．Troms6 Mus，Skrifter，3（3）：279－362，text一負gs，32－52。 1942．The Amphipoda of N．Norway and Spitsbergen with a（ljacent waters．Ibid．， 3 （4）＝363－526，text－figs，53－78， 1944．Some Japanese amphipods．Vidensk。Medd・fra Dansk naturh・Forenり108： 25－88，33text一丘gs． 1944a。 Crustacea Malacostraca．VIII（Amphipoda IV）。 The Danish IngolfExpedition， 3（13）：3－51，38tex亡一丘gs． 1944b．The Zoology of East Greenland・Amphipoda・Me（1deL om Gr6nland・・121（14）： 1－165，18text．丘gs，，3tables． TATTERsALLナW，M．1922、Zoological results of a to皿in the Far East。Part8．Amphipoda with notes on an ad（iitional species of Isopo（1a．Mem．Asiatic Soc。Benga1，6：435－459，pls。 18－21． THoMsoN，G，M．1879。New Zealand Crustacea，with（1escriptions of new species，Trans．N．Z， Inst．，11；230－248，p1．10． 1879a．A（1dition to the amphipo（10us Crustacea of New Zealand．Am．Mag．Nat。 Hist．，（5）4（22）：329－333，pl．16． 1880．New species of Crustacea from New Zealand、Ibi〔iり（5）6：1－6，p1．1， 1881． Recent ad（1itions to an（1notes on New Zealand Crustacea、 Trans，N．Z。Inst．， 13：204－221，pls．7－8。 UENo，M．1933．Freshwater Crus亡acea of I亡urup．Annot。ZooL Japon・，14：109－113・1五9・ 1935， Crustacea collecte（1in the lakes of Southern SakhaIin． Ibi（1り 15 （1）：88－94・ 4figs。 UTINoMIンH．1947。 Capre1】i〔1ae of Japan and adjacent waters，Seibutu，Supp1り1：68－8278 text一丘gs、（ln Japanese）・ 348 K．NAGATA

WALKER，A．0．1898．Cmstacea coIlected by W．A．Herdman，F．L．S．，in Puget Sound，Paci丘c coast of North America，Sept．1897．Proc．Trans．Liverpool BioL Soc．，12；268－287，pls．15－16。 1904．Report on the Amphipo（1a co1玉ected by Professor Herdman，at Cey1Qn，in1902・ Ceylon Pear10yster Fisheries，Supp1。Rept．，17：229－300，8pls． 1909．Amphipo（1a Gammaridea from the Indian Ocean，British East Africa，and the Re〔1Sea． Trans．Linn、Soc。London艶（2），ZooL，12：323 344，pls．42－43。 WATKIN，E．E．1939．The pelagic phase in the Iife history of the amphipod genus Bσ吻ρ07召畝 Joum．Mar、B孟oL Assoc，United Kingdom，23：467－481，2亡ext．figs，，4tables、