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Transactions and Proceedings of the Palaeontological Society of Japan
New Series No. :30
Palaeontological Society of Japan june 20, 1958 CONTENTS
TRANSACTIONS Page
335. Saba lites a us den Wakata Schichten von Tsushima. Nordkyushu ...... Kiyoshi TAKAnAsHr 185 336. On the Miocene Pectinidae from the Environs of Sendai; Part 10. On Pecten (Aequipecteu) yanagawaensis No:-.wuA and ZrNno ... Koichiro J'VI.o\suDA 189 337. Supplementary Descriptions of the Liassic Pelecypods from the Kuruma and Shizukawa Groups in japan ...... Itaru liAYAMr l!:J3 338. Species of the Genus Neptunea from the Palaeogene Formations in the Kushiro Coal Field. Hokkaido, japan ...... Masaru l'vL\Tsur 201 339. So~e Cambro-Ordovician Fossils from the ;Tan'gyang or Tanyo District. South Korea ...... Teiichi KoBAYASHI 211 340. "Monoplzyl!ites" arakurensis sp. nov. from the Maizuru Zone ...... Keiji NAKAZAWA 217 PROCEEDINGS ...... 222
President : Hisakatsu YABE
Councillors: Kiyoshi AsANO, Riuji ENvo (Business and Accountant). Seido ENoo. Haruyos}li FuJnroTo (Publication), Shoshiro llANzAwA, Kotora HATAr. Ichiro HAYASAKA (General AITairs), Kazuo HuzroKA, Teiichi KonAYAsm (Editor), ]iro MAKIYAMA, Tatsuro MATSUMoTo, Masao MrNATo. Tokio SHH All Communications relating to this Journal should be addressed to the PALAEONTOLOGICAL SOCIETY OF JAPAN Geological Institute, Faculty of Science, University of Tokyo, Japan Trans. Proc. Palaeont. Soc. japan. N. S .. No. 30. pp. 185-188, pl. 27a, June 20, 1958 :1:15. SABALITES AUS DEN WAKATA SCHICHTEN VON TSUSHI.MA, NORDKYUSHU* KIYOSHI TAKAHASHI Geologisches Jnstitut, Kyushu UniversiUit :X'·Jf.fi~lBIJYlilfr Sabalites: ,:.(f)~*(t. tJ.rY.i- [MJ$J1t9:t.f\:i.:.J: fJ, lill.:U:UfH: L·n·~Wfill'l r::51Il 1..1~ rtrtJ·(,~I;;l.i~tt. :ttlfb~~~eH:f~'ffil~c.-n·L rJrm'J l'~FH::U.i (f)Jmt\liit~flllft'lr$1.:~-t~ • .:_(f)ffi'f;-f(;e, flY:*- tlfi!!!'I'J,t-__.,m~t;·i~JvC\•7.. Sabalites nipponicus ~.; J:lf S. chineusis .1:l2 .l<~i nleitung Ris heute wurde schon von cinigen Forschern eine zicmlichc Anzahl von Saba lites uipponicus ( KRYsHTOFov rcH) a us den palaogenen Format ionen in den Kohlenfeldern von Hokkaido, Ube, Nordkyushu u. a. veroffcntl icht. Zuerst wurdcn Yon A. KRYSHToFovrcH (1918) die palmartigen Pflanzenfossilicn aus den Kohlen eingclagerten Schichten von Bibai. 1-lokkaido unci Takashima. Kyushu als Saba/ nipponira n. sp. be schrieben. Nach ihm haben S. ENoo, T. NAGAO, H. YABE, H. MATSUSill'!'.-\, T. YAMASAKI u. a. iiber Saba/ites niPfJOnicus (KRYSIITOFOVICH) aus den altterti~iren Schichtcn von Ishikari. Ube und Nord kyushu berichtet. S. ENno (1934) hat noch eine andere fossile Art, Sabalites chinensis Abh. 1. x : Fundort (Wakata) von Sabalites ENno. aus dem Fu-shun Kohlcnberg lais/mensis TAK. I: Izuhara. K: wcrke der Siiclmandschurei (Fushun Komoda, Ke: Kechi. S: Shiohaina. Schichten-Gruppe; oberes Eoziin) bes chrieben. Der Verfasser berichtet bier Das vorliegende Fossil wurde vor von einer neuen Art von Saba/ites aus Ianger Zeit von T. 0KABr: im sog. den Wakata Schichten von Tsushima. .. Wakata-Stein" gefunden. Seitdem wares lange in der Hoheren Schule Tsu *Received June ll. 1957: read June 15, shima bewahrt, bis Dozent Y. OKAMoTo 1957. es zur Forschung zu mir gebracht hat. l8p 186 Kiyoshi TAKAHASHI Bei dieser VerOffcntlichung ist l..L.: 1'? der Verfasser Herren Prof. Dr. T. f.?_:=.:l lVL<~.TsuMoTo, Prof. Dr. R. Toi{JYAMA 0 E ~ unci Dozent Y. OK.'\MOTo an dem 0 .c 1 geologischen lnsti t u t der Un i vcr 0 ~ siUit Kyushu uncl Herrn Y. lh. .-,:-;o ~ an der Iliiheren Schule T:~ushima 2 fur ihrc freundlichcn Anregungcn LLI F=-=J zu grossem Dank verpflichtct. Fr 1=-=:J muss auch hicr I-Ierrn Dr. S. ENDo. 3 (L der bei der Bestimmung cler Art ireundliche Ratschliige gegcben Cd 4 hat, von ganiem Herzen danken. Dieses Spezimen befindct·sich im Heim:~t:Museum (Kyodo-Kan) von Izuhara, Tsushima. xx ~~-:--:-- x x Taishu Sl'h~ehten-Gruppe VerOffentlichungen beziiglich der Geologie und Stratigraphie von Tsushima sind \'erhiiltnism:issig wenig. D. SATo (1908) hat zuerst dariiber verdffentlicht. Fr setzte ihr geologisches Zei tal ter in das ~?~QP Mesozoikum. I. TATEIWA 11934) __ ~._ • Sabal.i f-_-_--:.._- X tos u.a. hat die Ablagerungen von Tsu ~----==-~---4='·...::;::;: .. ·::::i· •. ~- .. shima im ganzen als Taishu o(J Schichten-Gruppe bezeichnet. ihr I LL .; . .-.:·· geologisches Zeitaltcr dem Dan t- angeordnet, und die Tatigkcit dcr en ~----_-_ Laramid-Bewegung in Ostasicn ~ t--=--..:.. o 95o- r- __ betont. E. KoN'No* und T. MATst; (/) 1000 .. , ...... MoTo* haben im Jahre 1913 den /:"'..:...... :.-: <( bi..L 1----- Uber blick der Taishu Schichten E o '"' ::J E \:'_:__..=_-:- Gruppe gemacht unci sind zu dem }-- Gl I~ g 500 --- . Schluss gelangt. dass die Taishu 1- .... 0 .... :~::·.·.~··.'. ~x Schichten-Gruppe durch die ges c 'C 0 ammelten Fossilien clem Terti:ir :::> E o 600• r· .-: -. ---: . zu~uteilen ist. S. KANNo (1955) hat ~ u.: ..!..? '_,_; ·_;_: ~ ~-- geschlossen. class das Zeitalter der Taishu Schichten-Gruppe durch die Abb. ~. Bcgrifflichcs Profil dcr Taishu Muschclschalereste, die im Innercn Schichten -Gruppc. 1 : Schicfcrton und Schlammgestein. 2: Sandigcs einer Grube der Taishu Mine Gcstcin. 3: \Vechsellagerung von Sandsteins und * fhr Erforschungsresultat der Taishu Schieferton. 4: Sandstein und Kong lome rat. QP: Quarlz-Porphyr (Sill), Mollusken- oder Echi Sc~ichten-Gruppe ist unvertiffentlicht. x: nusrest, x: P!lanzcnrcst. [Anm.]: Gruppe bc~culct Schichtcn-Gruppe und F. steht fiir Schichten. Sabaliles aus den Waknta Schichtcn von Tsushima, Nordkyushu 187 gefundcn wurden, OJ igomiozan ist. Der ist nicht so gut erhalten, aber stark Verfasser untersucht seit dem jahre eingeschlagen. Der griisste Teil dcr 1951 die Geologic von Tsushima. Er Blattlamina ist zersWrt; die Form hat die Schichtenfolge der Taishu viclleicht fiicherformig. iibcr 50 em im Schiten-Gruppe festgestcllt. Ihr begriff Diameter. Die Rachis et was stark. ca. licher Durchschnitt ist in der Abb. 2 1.4 em breit. sich an der Rlattbasis gegeben. nicht vergriisscrnd. allmiihlich nach lm Ontcr- und Oberteil der Taishu obcn schmalcr werdend. Der Bla'Hsticl Schichtcn-(;ruppc sind Sandsteinc und ist relativ stiimmig. ca. 3 em breit, sandigc c;esteine verh~iltnismassig gro Blattstielrtinder ohne Dornen. Die sser als Schiefertonc. lhr mittlerer st rahlenform igen Fieder rei chen bis Teil zeigt mehr Schlammsteinc odcr zur Rachis. etwa 50 an der Zahl, Sehicfertone als sandige Gesteine. linear-lanzettfiirmig, gemcsscncs l'vlaxi Sandsteine stellen zuwcilen dlinne lin mum ihrer Breite 1.3 em. Der 1\iittel senartigc Konglomerate. die haupts:i ncrv regelmrissig stark. dcr Seitcnncrv chlich aus den Kiesel von schwarzem parallel dem 1\littelnerv. undeutlich. Schieferton. Sandstein und Chert bes lhre Textur rclativ dUnn. aber steif. tchen. unci dazwischcn zeigcn sie Vcrgleich :-Dcr vorliegen.clc Rest ist bemerkenswerte Verschiedenheit in der cler japanischen paliiogcncn Art Saba l\1tichtigkcit. Das kommt oft vor, class lites nipponiciiS (J\RYSHTOFoV!CH) Ulld ein etwa 5 em zu 20cm dichter hret dcr ehinesischcn obereoz:inen Sabalites tartiger Sandstcin mit dem schwarzen chinensis ENn" schr iihnl ic h, a her sie dili1nen Schieferton aufeinandcr altcr haben einigc versehicdcne lVIerkmalc. iert und an dcr Ober- unci Untcrflilehe I>cr bestchende Rest hat rnehr zahl solches Sandsteins Rippel- oder Rill n•iche Strahlen. starkere Rachis und l\1arke gcdruckt ist. Man kann auch st!immigeren Blattstiel als Sabalites zuweilen Lebensspuren im Sandstein nipponicus ( 1\ J~YsJJToFov Jell) u ncl starker linden. Naeh K. FuJJJ ist Sanclstein von cariniertc Strahlen, st:irkcre I~achis Tsushima ei n Su bgrau wacke-Typus. unci weniger Maximum der Blatt Man kann allgemcin viele Musehel brcitc als Sabalites rhinensis ENoo. schalerestc im schwarzen Schieferton Zahlreichc Bcrichte von Sabalites aus oder Schlammstein linden und auch den oberkrcidcn und paliiogenen For die Eehinusreste. die von A. MoRISHITA mationen Nordamerikas sind bekannt. a is Pericosmus cf. spatangoides LoJ~JoL * Einc amerikanische Art Sabalites vicks bestimmt wurden, linden sich meistcns burgensis BERRY hat geringere Zahl der in sandigem Schieferton oder Fein St rahlen und mehr brei ten Blattst rahl sanclstein. als vorlicgcndc neue Art. Die vorlie g('nde Form ist nichl genug erhalten, Beschreibung nm Sabaliles aber sic win! durch obcn erwiihntc Sabafites taislmensis n. sp. Merkmale als selbsUindigc Spezies be t rachtet. Tafel 27a. Figur I. ( ;l'O{ogisches Zeit alter:-Vielleieht OJ i Beschrrilmng:-Das vorliegende Blatt goz~in. * A. MoJUSIIIT.'\, gcol.-mineral. Inst. der Fwulort :-Izuhara. Wakata, Provinz Univ. Kyoto, hat die Echinusreste aus dcr Nagasaki (Tsushima-lnseln). Taishu Schichten-Gruppc untersucht. ;lufbewalmmgsstel/e :-Ilei mat-Museum 188 Ki yoshi T AKAIIASIII (Kyodo-Kan), lzuhara, Provinz Nagasaki Japanese' Islands. (jap.) (Ttmshi ma-l nseln). KANNO, S. (1955). Tertiary Mollusca from Taishu i\Iine. Tsushima Nagasaki Pre Literatur fecture. Japan. Trans. Proc. l'alaeonl. Soc., Japan, N. S .. No. 18, pp. 31-36. KRYSHToFovrcrr, A. (1918). Occurrence of REm, E. M. & CHANDLER, M. E. J. (1926), The ·the Palm, Sabat nipponica n. sp.. in the bembridge Flora. Brilislt Must•um(Natural ·Tertiary l~ocks of Hokkaido and Kyushu. llistory). ,..Jour. Geol. Sm·. Tollyo, Fol. 25. So. 3, pp. SATO, D. (1913-14). Erdgestalt und Geologic '5~-66. von Tsushima. (jap.) ]our. Gt•o~:r., Vols. BEyY. E. W. (1924). The middle and upper 25. 26. --Eocene Floras of southeastern North TATEIWA, I. (1931). Cretaceous Flora of America. U.S. Geol. Surv. Prof. Paper. 92. Tsushima, Japan. japan. jour. Geol. ENDO, S. (193-1). The geological age of the Geogr., Vol. XI, pp. 185-209. Fu-shun Group, south l\[anchuria. Proc. YAMASAKI. T. (1952). Discovery of Sabaliles Imp. Acac/., X, No. 8. pp. 486-489. nipponicus (KRYSH.) from the Karatsu -- (1953), Notes on the Cainozoic Plants Coal-field. Kyushu, japan. Mem. Fac. of East Asia (1. 2). Kumamoto ]our. Sci., Engi11 .. Kyuslm Unil'., Vol ..\'111. No. 1. Ser. B. No. 2. pp. 65-70. -- (1955), leones of Fossil Plants from ------ Erk Iii rung der Tafel 27a Fig. I. Saba/i(PS faislmensis TAKAHASHI. n. sp...... p. 187 X ca. 1/2. Fundort: lzuhara. \Vakata, Provinz Nagasaki. TAKAHASHI: Sabalites von Tsus hima Plate 27a MAsUDA : Miocene Pectinidae Plate 27b la lb 2a 2b 3a 3b 5a 5b 4 6a 6b Trans. Proc. Palaeont. Soc. Japan, N. S., No. 30, pp. 189-192, pl. 27b, June 20, 1958 :38!i. ON THE .MIOCENE PECTINIDAE FROM THE ENV 1RONS OF SENDAI; PART 10, ON PECTEN (AEQUJPECTEN) YANAGAWAENSJS NOMURA AND ZINBO• KOICHIRO MASUDA Department of Geology, Faculty of Education. Tohoku university {Jilhlnnrlllfrkdf.ilff Pectinidac: .:r-17) 10. Pecle11 (Aequipecten) yanagawaensis NOMURA and ZINno ]:.--:>~ .~c: vtllti«J J: IJtJ:~ l..f~~iXI7)~*· ~:t;~...f,:~~{(ft.lftVC:jJJ;li!~~fj., f.:. • .If! lll 'if:- .Q& Pcclt' n (/lequijJec I en) ya nagm{'(zensis was type specimen and the others of the first described by S. NoMURA and N. Saito Ho-on Kai l'vluseum, all in Sendai ZINBo irom the Yanagawa formation at City, ·were studied. and the results of Yanagawa-machi, Date-gun, Fukushima examination are presented herein. Prefecture in 193G, and subsequently Acknowledgements arc clue to Dr. it was reported from the l\Ioniwa for· Kotora HATAI of the Department of mation at Moniwa. Sendai City, by S. Geology, Faculty of Education, Tohoku NoMuRA in Hl40. As the type speci · University, for his kind supervision. men was imperfect and some important features were not described at the time Family Pectinidae of i ls proposal. thus writer wishes to redescribe the characteristics of this Subfamily Pectininac species based upon the specimens which Genus Cl)'j>lopectew·n,,~.~.. BARTscH were collected from the Moni\va for mation by the writer. and to clarify and REHDER, 1938 its relationship \Vi th certain other Cryptopecten ymwgawaensis species mentioned in this article. Numerous specimens of this species (NoMURA and ZINBO) and a related species which are preserved in the collections of the Plate 27b. Figures 1-8. Department of Geology. Faculty of 1936. Pecten (Aequipecten ?) yanagawaensis Education. of the Institute of Geology Nol\IURA and ZINBO, Saito /lo-on Kai and Paleontology, 'Faculty of Science. JJus .. Res. Bull., No. 10, p. 337, pl. 20, both of Tohoku University, and the figs. 2a-h. 1940. Pee/en (Aequipec/en) yanagawaeusis No· * Rcc~iv~d Aug. 8, 1957: read at the 66th l\HmA and ZINBO, NoMIIIlA, Sci. Rrp., meeting of the Society at Akita, June 19, Tolwku Imp. U11it•., Sr•r. 2, Vol. 21, No. 1957. 1. pp. 19-20, pl. 1, figs. 10-13. 189 190 Original description is as foil ow:;: and regularly concave; valves radiate "Shell small. suborbicular in out ly ribbed. and forming an angle of line. inflated. nearly as 'long as high. about 90° at apex. equilateral; !?ide of disc more or less Right valve with about 21 elevated. Concave, apical angle about ll0°, Yen more or less squarish. rounded radial tral margin regularly curved. Surface ribs accompanied With a tine thread ornamented with subequal. rounded ra on both sides of radial ribs; inter dial ribs which are accompanied with spaces nearly equal to or a little a thread on both sides and close to broader than the ribs themselves. and their base; interspaces rat her deep, sculptured with numerous. transverse, broader than ribs themselves, sculp fine lamellae; anterior auricle larger tured by fine transverse I ines. Ears than posterior, sculptured with a few imperfect, preserved one ornamented distinct radial threads and concentric with unequal ra~ial riblets crossed lines. and furnished with deep byssal by fine growth-lines. Height 20 mm .. area; posterior auricle triangular in length_ 21.5 mm .. depth 5 mm." form, truncated behind at about right The specimens collected by the writ angle, and similar to anterior in sculp er from the Moniwa formation at l\lo ture, though radial threads less dis niwa take the following d_escription. tinct than anterior; hinge with narrow Shell small in size. moderately thick. and shallow resilial pit. ctenolium. and suborbicular in otitline, ·subequivalve. conspicuous cardinal crura ornamented the right valve being a I ittle more by fine transverse incision. Left valve convex than the left. in-equilateral. the with sculpture similar to the right. length of posterior sic!c· being longer Internal surface of valves rather than that of anterior: sid-e, and pos smooth except for characteristic mar terior submargins longer than anterior ginal serration. Dimension (in mm.) :- Valve Right Right Right Right ' Left Left Left Left Height 25 22.5 19.3 14.5 29 23 19.5 ---- Ll.•ngth '!.7 23 19.5 1:. 7_ : 82 -----;ul----;- ~- IS~ 12.5 11 9 I 6. 7 15 11~ I~ ------s.5 ~-- LPS+ II H5 12 10. 5 I 8 17 ~ - -l2. 7~-~1.-~ _1_0_ 1-Iingc-length II-- 12. 5 12.5 10.6 I 10.5 15 11 1 10.5 10 ---- Depth 11 5 6 ~1 __3._6_- 8 -~,~~~6-_-1 ____6~= ~-5_.5_ Apical angle 95" go· go· go• 95• 95' 1 go· 90" I ------110• Growth angle 105· I 100' I 95' I 110" i 105" I 100' ~-~ + ...... LAS=abbrcviation for length of anterior side. LPS=abhreviation for lcngt h of posterior side. Type locality, Formation and i\R'e :-R iv east end of Yanagawa Park, Yana cr cliff of the-Hirosc-gawa, at the south- gawa-machi, Date-gun, Fukushima Pre- On the i\Iioccuc Pcctinidac from the Environs of Sendai 191 fecturc. Yanagawa formation. Early which yauagawaensis once lived may l\'lioccne. be interpreted from the nature of the Remarl NoMURA. S. and N. ZINBO (1936), Addition· in the Vicinity of Sendai, ~liyagi Pre· a) Fossi I Mollusca from the Yanaga wa fecture, japan. Sci. Rep., Tolwku Imp. Shell-Bed~ in the Hukusima Basin. Unit•., Ser. 2, Vol. 21, No. 1, pp. 1-·16, Northeast llonshu, japan. Saito l!o-on 3 pis. Kai Mus., Res. Bull., No. 10, pp. 335-3•15, YoKOYAMA, M. (1920), Fossils from the 1 pl. 1\Iiura Peninsula and its Immediate -- (19-10), Molluscan Fauna of the l\Ioniwa North. ]our. Col/. Sd., Tokyo Imp. Unit•., Shell Bed exposed along the Natori·gawa Vol. 39, Art. 5, pp. 1-193, 20 pis. Explanation of Plate 27b Figs. 1-8. Cryptopecten )'OII(tgawaensis (NoMURA and ZINBO) ...... p. 189 la, b. a, Right valve. X 1. b. Internal view of fig. Ia, X!. DGS. Reg. no. 3545. Loc. i\loniwa, Sendai City, Miragi Prefecture. 2a, u. a. Right valve, X 1. b. Internal view of fig. 2a, X l. DGS, Reg. no. :'l:i•l!i. Loc. Same as alltlve. 3a, b. a, Right valve, XL b, Internal vie\v of fig. 3a, X l. DGS, Reg. no. 21~0. Loc. Same as above. ·1. Right valve, xI. DGS, Reg. no. 35-16. Loc. About ·100 mrn. west of Jyunishindil, Kuma nodi), Natori-machi, Natori-gun, Miyagi Prefecture. 5a, b. a, Ldt vJlvc, X I. b, Internal view of fig. 5a, xL DGS, Reg. no. 354_5. Loc. l\toniwa, Sendai City,-Miyagi Prefecture. 6a, b. a, Left vt~fv·e, x 1. b, Internal view of fig. 6a, x l. DGS, Reg. no. 3545. Loc. Same as above. 7. Left valve, X I. 'DGS. Reg. no. 2140. Loc. Same as above. 8. Left valvt', x,t.5. DGS, Reg. no. 3546. Loc. About 400 m. west of Jyunishindil, Kuma· nud6. Nat!}ri-machi, Natori-gun, Miyagi Prefecture. Photo. by K. MAsUDA Trans. Proc. Palaeont. Soc. Japan, N. S., No. 30, pp. 193-200. pl. 28, June 20, 1958 :~:17. SUPPLE.MENTARY DESCRIPTIONS OF THE LIASSIC PELECYPODS FROI\f THE KURUMA AND SHIZUKAWA GROUPS IN JAPAN* (Studies on the Liassic Pelecypods in Japan. !J) ITARU HAYAMI Geological Institute. University of Tokyo *·IT7 f 7 7..0)-.·.j.Xf{o:>;Jc.f!XIiflJ.E: ~l'I!JII• *JIJiil~lffl!l'tKI.:tt,.:~;;*:lll·l~o:>..:::&WJ:!ll'''lr<~t~HT t'¢1./:, t~%'11\0)IjliJ·G Prolocardia. Pfeuromya, liomomya, Thracia 0)4#ftifi~o'H.rl0fili~;l!IUJ1lv t.:o:>-r,!Llokt-t;:," *zkJtfi!W:Yt ·o:>LH ·-=>~1. t oo:lltJ:m-r. Mf'H :tc~-rt..:t ,t.:lV -r. c. tt Go:>J; 'J .w ~Rt.-i!Ll•lill.!:htlitliHtllfjbtt.:S«~ bO)"t'ii;.:So ill JJ< m In this art iclc arc described the fol lowing Kuruma and Shizukawa spe Fa 111 i Iy Paralic lodon tidac Cies:- Paraltdodon sp. indct. Genus Paralldodon Grammatodm1 (?) sp. indet. fvlEEK and WoRTIIEN. 1866 i'rolocardia kurumensis, HA v Al\H. Pamllelodon sp. i ndet. new species Pleuromya hashidatensis HAYAMI, Plate 28. Figure l. new species Homomya saloi IIAYAMI, new species Only a right internal mould is at Homomya sp. indet. hand. Shell medium in size, elongated. Thracia suhrhombica HAYAMI, new species bicarinated. much longer than high(MM Thracia (?) sp. indet. 2800, 38.5 mm. long; 16.0 mm. high; 6.5 Cuspidaria ( ?) a sp. i ndet. mm. thick); umbo prominent, located Cuspidaria (') b sp. i ndet. at about a third of shell-length from l\lost of them occur not commonly. and front; postero-dorsal wing undeveloped: are represented poorly preserved speci ventral margin slightly concave in its mens insuflicicnt for specific identinca median part; hinge of Para/le/odon-type, tiun. More than five pelecypod forms very asymmetrical. composed of three besides these are distinguishable among elongated horizontal posterior, three the Kuruma-Shizukawa collection· be curved anterior and several median fore hand, hut the writer hesitates to teeth; no plate for adherence of post describe them, because their generic erior adductor. positions arc indeterminable at present. In the dentition and outline, this seems more related to Cosmelodon BRAN "' Received Oct. 2, 1957; read April 28, 1958. soN(l942)( =Beus/l(msenia in ARKELL, 1930) 193 ltaru l-JAYAMI than to Parallelodon (s. s.). But the sub form is more closely related to Gram generic reference is not further endors matodon than to Pamllelodon or Cuwl ed, because of the ignorance of the incli laea. The radial ribs are more wide nation of median tcl'lh and surface or spaced in the central part than on naments. Parallelodon niranohamcnsis lateral sides. But the shell-size is so l-IAYAMI (1958b) from the Hettangian Ni small for the genus that the writer ranohama formation is obviously differ linds no comparable species in foreign ent from this in the wider hinge-plate, literatures. developed postero-dorsal wing and ab Uccurrence :-Black sandstone at Shi sence of anterior carination. This is natani. probably an allytoCuwllaea lzettangil'llsis TERQtli·:M (1855) from I he lower Lias of Paris basin, which was included in Family Cardiidae Beuslwusenia by AR'""-L (1930). But its Genus Protocanlia lknucn, 1S.15 specific identification is deferred unt i I the external characters are known. Prolocardia· kurumensis IL"-YAMI, Occurrence :-Black sandstone of Dome new species rio-Toarcian Shinatani formation at Shinatani in Omi-machi, Niigata Pref. Plate 28, Figures 5-S. 1957, ]'rolocardia cf. COIII/Isa HEALEY, listed in KoBAYASHI and others, four. Geol. Genus Grammatodon MEEK, 1860 Soc. Japan. Vol. 63, No. 7 38, p. 186. Gmmmatodon (?) sp. i ndet. Desr.-ription :-Shell small to medium·, Plate 28. Figures 2-3. subtriangular, fairly inequilateral, strongly inflated, much longer than A left valve and two left internal high; umbo protruded above hinge moulds arc at hand. Shell very small, margin, recurved, slightly prosogyrous, trapezoidal, sharply carinated posterior submesial; anterior margin rounded, ly, not alate, much longer than high passing gradually into venter; postero· (left valve, Mi\1 ~801, 10.5 mm. long; dorsal one obliquely truncated. curving 7.5 mm. high; 3.0 mm. thick); umbo more or less abruptly towards venter; protruded above hinge-line, situated at surface divided into three parts by an about two-fifths oi' shell-length from terior and posterior blunt carinae; pos front; surface netted with roughly terior part occupying about a third of spaced radial ribs and concentric growth whole surface, marked with about 25 fine ·lamellae; hinge of Grammatodon-type, radial ri blets; remaining parts with fine fairly asymmetrical, composed of more regular concentric striae; hinge known or less elongated horizont I .'v/easureme11l i11 mm. Length Height ~_2~ickness Holotype (MM 2803) Left valve 21.5 1i.5 6.0 Paratypc (MM 2804) J{ight internal mould I 20.0 17.0 . i . 5. 0 Supplementary Descriptions of th<.: Liassic Pelecypods 195 side; right posterior lateral tooth short, 1957. Pleuromya aff. forsbergi nippanica KanA- subparallel to valve margin; adductors YASHI and IcmKAWA listed in KonA- \veakly impressed. subequal; inner vent· vAsm and others. lac. cit. ral margin finely crenulated in posterior Description :-Shell small, elongated. part where radials are distributed. thin, moderately inflated. about twice Obsemation and Comparison :-There arc as long as high (l\lM 2808, 30.5 + mm. eight specimens, but all more or less long; 16.S mm. high; 3.5 mm. thick); deformed secondarily. The holotypc antcro-dorsal margin short and oblique (Fig. 5) exhibits surface-ornaments of ly truncated; postero-dorsa I one long, Protocardia·type. The \Veak ventral fairly sinuated: umbo broad, blunt, sinuation is probably due to secondary located at about a third of shell-length deformation. because it is absent in the from front: posterior area wide and paratype (Fig. 6) and other specimens. fairly l1attened; surface marked with Several smaller specimens (Figs. 7 and somewhat irregular concentric growth· 8) from a black shale are strongly de lamellae: internal structure unknown. formed. and at a glance they are verv Obsen•ation and Comparison:-Two left different forms from the two type speci valves arc at hand. The holotype ex· mens from a sandstone. hibits the outline and surface-marking As listed before. this may be an ally of this species. although its posterior to Protocardia co/llusa HEALEY (1908) part is broken off. Unless the hinge is from the Rhaetic (or Noric) Napeng bed observable, it is not easy to distinguish in Upper Burma. But the posterior ra Homomya from Pteuromya. Generally dial ribs are about nineteen in the Na speaking. however, Homomya has a more peng species. whereas they are more rounded antero-dorsal margin, more in· than 25 in number in the present spe· ftated shell and larger clin;ensions than cies. The umbo seems to be slightly Pleuromya. In these features this protruded than in con/usa. There are agrees better with the latter than the many Jurassic species hitherto referred the former. to this genus. But this is distingui _Pleuromya forsbergi (BoiiM) nipponica shable from most of them in the more )\oBAYASIII and IcHIKAWA (1951) from trigonal outline and characteristic con the Carnic Kochigatani group in Sa centric ornamentation. kawa basin is very similar to this in Occurrence :-B I ack sandstone and the external aspects. Although NAKA· shale at Shinatani. Several specimen,; zAw A (1956) doubted its reference to procured also from a sandstone at the Pl~uromya, this is probably congeneric upper stream of Kanayamadani. and w1th the Carnic species. But specifi· one from a black shale at the middle cally this is different from that with stream of Tsuchizawa. regard to the more salient umbo and ·less elongated outline. ~his is more or Family Pleuromyidae less similar to the holotype of Homomya matsuoensis NAKAZAWA (1956. pl. 2, figs. Genus Pleuromya AGAssiz, 18,13 1a-e). Compared with its paratype P/euromya hashidatensis (figs. 2a-d). however, the posterior area is much more expanded than in matsu HAYAMI. new species oensis. The shell-size of matsuoensis is Plate 28, Figure.: 9. more than 50 mm. in length. Namely, 196 ltaru HAYA!'.ll it is much larger than this species. land, but differs in the more posteriorly Occurrence :-Black arenaceous shale located umbo. of Domerian Teradani formation (Ama/- Occurrence :-Sandstone at Sh ina tani. 1/zeus-bed) at Kanayamaclani in Omi machi. Niigata l'ref. Collected by ToKu Jfomomya sp. inclet. YAMA*. Plate ~8. Figure II. A solitary bivalved internal mould Family Pholadomyidae belongs to an old collection of this in Genus 1/omomya AGAssiz. 18•13 stitute. It is procured from the Kuru ma group. but its exact locality and llomomya satoi IIAYAMI, horizon are unknown. This differs from new species. the preceding in the more elongated outline, sinuated postero-dorsal margin I' late :!8, Figures 10 a-c. and narrow posterior gaping. Its spe cific identification is deferred until bet !Jesrri/Jfiou :-Shell medium. oblong. ter material is procured. Specimen. subequivalve or equivalve, inequilater i\ll\1 2811, 50.5 mm. long: 25.5 mm. high; al. inflated, thin. about 1.5 times as 24.0 mm. thick. long as high (lwlotype. 1\11\1 2810. 5.t.O mm. long: :35.!imm. high: 26.5mm. thick. bivalved): antero-dorsal margin short Family Thraciidac and rounded: postero-dorsal long and nearly straight: valve margin closed in Genus Tltmcia lh.AINVII.LE, 1821 anterior but gaping widely in posterior Tlzracia subrlwmbica l-IAYAMI, half: umbo located at about a fourth from front; surface marked with irre new species. gular concentric plications and growth Plate 28, Figures 12-14. lamellae: hinge unknown but probably Description :-Shell medium. compress edentulous. ed. thin. subrhomboidal in outline, much ObserMtiou and Comparisou :-A soli longer than high; antero-dorsal margin tary bivalved internal mould is at hand. very slightly convex, while postero judging from the rounded anterior dorsal one is nearly straight or slightly margin and strong convexity of the shell, this is referable to Homomya, in concave: posterior margin subvertically truncated: ventral margin more or less stead of Pleuromya. This resembles abruptly turned near its mid-point: 1/omomya signicollina .MARw ICK (1953) from the Middle jurassic of New Zea- posterior area flattened, defined by a blunt carination; surface marked with . * The writer is grateful to J'vlr. A. ToKu irregular concentric plications and nu YAMA for the donation of the specimens. merous growth-lamellae. Aleasuremeni i11 mm. Length Height Thickness Ilolotypc (MM 2SJ2) Right valve 33.f; 24.() 3. 0 Paratype (1'\'ll\1 2813) Right valve 33.0 22.5 3. 0 Paratype (MM 2814) Left valve 38 5 26.5 3. 5 Supplementary Descriptions of the Liassic Pele..:ypods 197 ObserNII ion and Comparison :-Seven single-valved specimens arc at hand. Tliracia (?) sp. indet. Judging from the opisthogyrous umbo. thin test and general outline. this is Plate 28, Figure 15. referable to Tlzracia. although posterior There is an internal mould of left gaping, hinge-structure and muscle sys valve (MM 2815, 20.0 mm. long: 1-1.5 mm. tem arc unknown. It has been discuss high: 2.0 mm. thick) on which concent ed by some palaeontologists whether ric surface-markings arc impressed. Tlzracia lkAINVILLF. (18~-t) appeared al This is fairly similar to Tln·acia prisca ready in the Jurassic. The writer con HEALEY (1908) from Napeng bed with siders here Corimya AcAsslz (1843) and regard to the similar outline and sur Ilomoeodesma F1scnr-:R (1887) as two syn face-markings. But the material is omyms of Tl11·aria in agreement with compressed secondarily, and its specific ARKEl.l. (1929-37). identification impossible at present. This is distinguishable from the hi Occurrew:e:-Black shale at Shinatani. therto described species of Thracia in the more rhomboidal outline. This is fairly similar to Thracia clepres~a SowER· Family Cn!lpiclariidlw nv (1823, Vol. fi; A111 ~~~~- . ------~--- ,l/easurement in mm. Length Height Thickness (MM 2817) Left valve 19.5 13.5 3.5 (Ml\1 2818) Right internal mould 17.0 11. 5 2.5 (iv!M 2819) Left internal mould 20.0 II. 5 3.0 Obsen•alion and Comparison :-Five strongly deformed secondarily. it is right and three left specimens are at observable that the posterior area of a hand. Although most of them are left valve is more contorted than a right 198 ltaru HAYAMI and that the postero-dorsal margin is and Isognomou in Japan (1957, japan. more convex than in right. ]our. Ceo!. Geogr., I·'ol. 28, Nos. 1-3.) was This is a ven' strange form, and its completed, many well preserved speci taxonomic position cannot be decided at mens of I sognomon rikuzeuicus (YoKo· present. The outline and inequivalve YAl\IA) were obtained from the upper shell remind one of corbulid. Corlmla most part of the "Cyrenoid bed" at easlonii VoGEL (1900) from the Jurassic Niranohama. Judging from the materi of Borneo and some other Jurassic cor al. the outline is fairly variable and bulids. in fact. show more or less similar the byssal gape is fairly wide and the outline and posterior carination. But anterior margin sometimes strongly con this cannot be referred to the genus by cave below the terminal beak as seen the thin test. This is probably more in Isognomon (s. s.). Its juvunalia have related to the Cuspidariidae, although very terminal and protruded umbones such a sharp posterior carination and and fairly different in outline from short posterior area are unknown in Isognomon cf. rikuzenicus from the Ku them. "Cuspidaria ·• ayabensis NAKAZAWA ruma group at Neiridani. Two inter (1956) from 1he Carnic Nabae group has nal moulds of I he latter form illustrat such a posterior area and may be con ed in that paper are probably adults generic with this. But the shell is less and specilicaHy distinguishable from elongated and the size much smaller rilmzenicus. than in that species. 2. Volsella /!allel!el!oides HAYAMI (1H58a, Trans. Prnc. Pal. Soc. Japan, N. S., No. 29) has been represented by three com Cuspidaria (?) b sp. indet. paratively small specimens. But recent Plate 28. Figures 20-21. ly a large left valve (MM 2822, 70.0mm. long: 675 mm. high : 11.0 mm. thick) There are nine specimens which re was supplied from the same locality. semble the preceding form in the ex It is obviously conspecific with the bolo ternal aspects and probably congeneric type of baluwe/loides. judging from its with it. But the shell is much smaller growthlines, though its anterior wing (left valve. MM 2820. H.O mm. long: 5.0 is comparatively small. It is illustrated mm. high); posterior area more pro in Pl. 28, Fig. 4 in this paper. The truded backwards and defined more generic name Volsella, the oldest name sharply. The left valve is marked with for the genus. was rejected by an opin fine concentric lines, and the right valve ion of the International Commission with more wide-spaced gro\vth-lamellae. of Zoological Nomenclature and has But the discordance may be partly at been replaced by a younger name tributed to secondary deformation. This J\1odio/us. Therefore, the generic name form is probably an ally to Neaera sam· Volsella ScoPor.J, 1777 in that paper basana Voc.EL (1900) from the Jurassic should be read Jltlodiolus LAMARcK, 1799. of Borneo. Ocntrrence :-Black shale at Nirano· hama. References Postscript AGASSIZ, L. (1843), Etudes critiques sur les Mollusques f-ossiles. Monographic des 1. After the writer's paper on GenJil/ia Myes. Supplementary llcscri ptions of I he Liassic Pelecypods 199 AIH ------ Explanation of Plate 28 Para/le/odon sp. indet...... p. 193 Fig. 1. Right internal mould (MM 2800) x 1. Loc. Shinatani in Omi-machi, Niigata Ptef. Grammatodou (?) sp. indet ...... p. 194 Fig. 2. Left internal mould (MM 2802) X 3. Loc. ditto. Fig. 3. Left valve (MM 2801) x 3. Loc. ditto. Modiolus bakellelloides (1-fAYAMI) ...... p. 199 Fig. 4. Left valve (MNI 2822) x I. Loc. Niranohama in Utatsu-mura. Miyagi Pref. Pro/ocarclia kurunu.>nsis HAY AMI, new species...... p. 19-1 Fig. 5. Left valve, holotypc (MM 2803) x 2. Loc. Shinatani. Fig. 6. Right internal mould, paratype (MM 2804) x 2. Loc. ditto. Fig. 7. Right valve (deformed) (MM 2805) X 2. Loc. ditto. Fig. 8. Right valve (deformed) (MM 2806) x 2. Loc. ditto. Pleuromya has!Jidateusis HAYAMT. new species...... p. 195 Fig. 9. Left valve, holotype (l'vfl\1 2808) X l. Loc. Kanay:unadani in Omi-machi. llommnya satoi HAY AMI, new species ...... p. 196 Fig. lOa-c. Bivalved internal mould, holotypc (MM 2810) X 1. Loc. Shinatani. llomomya sp. indet...... p. 196 Fig. 11. Bivalved !lpecimen (MM 2811) X 1. Loc. unknown. Thracia subrombica 1-fAYAMI, new species ...... p. 196 Fig. 12. Right valve, holotype (:t--.IM 2812) X 1. Loc. Niranohama. Fig. 13. Left internal mould. paratype (Ml'vl 2814) X I. Loc. ditto. Fig. 1-1. Right valve, paratype (1\IM 2813) X 1. Loc. ditto. Thracia (?) sp. indet...... p. 197 Fig. 15. Left internal mould (l'vfl\1 2815) X 1. Loc. Shinatani. Cuspidaria (?) a sp. indet...... p. 197 Fig. 16. Left valve (l\IM 2817) X 3. Lnc. ditto. Fig. 17. Left internal mould (MM 2819) x 2. Loc. ditto. Fig. 18. Left internal mould (MM ~823) X 2. Lnc. ditto. Fig. 19. Right internal mould (iviM 2818) X 2. Loc. ditto. Cuspidaria (?) b sp. indet...... p. 198 Fig. 20. Left valve (MM 2820) x 3. Loc. Niranohama. Fig. 21. Right valve (MM 2821) x 3. Loc. ditto. All specimens here illustrated arc kept in the Geological Institute, University of Tokyo. HAYAMI: Liassic Pelecypods Plate 28 19 15 C. UEKI photo. Trans. Proc. Palaeont. Soc. Japan, N. S .. No. 30, pp. 201-210, pis. 29. ;{0. June ~0. 1958. 3:18. SPECIES OF THE GENUS NEPTUNEA FROM THE PALAEOGF:NE FORMATIONS IN TilE KUSHLRO COAL FIELD. HOKKAIDO. JAPAN* MASARU MATSUI Department of Geology and Mineralogy, Faculty of Science. Hokkaido University ----~~- :ltlliiQ~li!tt/,i,:ffi'i!i~l~~lf4vP.o:> Neptu11ea ~ft1'i: ~li!ltif{ffi0i 1 i~~{CfM. iillrlle'lltf:H .t v:1nm ~mr=.i!E-t 7.> N••Ptzmea 1/ij~~;{;Jt..,.. 9 t'TI~it2~ (5 Wrfill~-" Nine species bPionging to the genus sho\\'S certainly to have been deposited Neplunea, the typical cold water cle under the brackish- or sea-water. The ments of the so-called Poronai fauna. Tenneru formation (U 3) is also locally will be described in this short note. represented by marine facies and con All these specimens at hand have been tains molluscs. although they are less collected by the members of the Depart numerous than those of the Sitakara ment of Geology and l\lineralogy. in formation. cluding the present writer. They were Now. for all these marine formations found in various horizons of the Palaeo as well as marine intercalations above gene deposits developed widely in Ku noted, the specific distribution of the shiro coal field. southeastern Hokkaido. genus Nep/unea can be tabulated as in which are usually regarded to be eli the following table (Table II). visible into main two divisions, the Ura Before going into the description. the horo and the Onbetsu formations re writer wishes to record his hearty spectively (See Table l). Of them, the thanks to Prof. rvlasao MtNATO, the Onbetsu group is exclusively represent Department of Geology and Mineralogy, ed by the marine facies. having nume Hokkaido University. for his kind read rous molluscan fossils. It probably cov ing of the manuscript. For the helpful ers the former conformably. and may criticisms thanks are also offered to be subdivided into four formations (0n1 Messrs. Satoru UozuMI, Tsutomu FuJIE, -On1 in Table I) from its lithological a Iso of the same Department of the facies. The Urahoro group consists Univ., and to 1'11·. Tosio YAMAMoTo, a mostly of the coal measures and thick geologist of the Mciji Coal Mining bedded conglomerates of terrestrial ori Company. gin; it is relatively poor in marine This study has been financed by facies. except for the so-called Sitakara grants from the Science Research Fund formation (U,). of which fossil content of the .Ministry of Education, to which the writer acknowledges his indebted * Rl·ceived July 15, l!J57: n~ad June 15. 1957. ness. 201 l~ 0 Table I. Classification o( Palaeogene Sediments of the Kushiro Coal Field. t.: Group Formation J Lithology _____1Thi_c_k_ness Facie~ ______JV_ra_i_n_f_"_s_s __ ii_s ___~. 1 ~~-- --· Chokubetsu Grc;ish compact hard shale, intercalating I~ 200m. marine : (On,) , black sandstone patches. ,_ 'I:)a'rk- -tilffaceous 0 grey sandst(mc. contammg Yoldia lauda/Jilis YoK. ::l pyroclastic.grains, and sometimes intercala 0' I Nuibetsu Pvrtlmulia zmtasl'i KAN. ted thin aggrorneratc in the middle and 300 marine ~ (Ona) Thvasira bisect a CoN R. "'c _Lipper parts. Perij>loma bess!we11.~is (YoK.) Cl Dark grey mudstone. intercalated marly Ve11ericardia akagii KAN. .., 'Charo " Tapes" ezoensis YoK. 0 layers and nodules, calcareous bands. thin 250 marine <: (OnJ white tuff. Malfetia poronaica (YOK.) '0 Trodwcerithum ll'ltdmmm (YoK) ---c;reenish sanostr>l1e. intcrc;ltatmg tflln cong Ncptunea onbetsue11sis MATSUI Omagari lomerate at basal part; upper part gra A11r'islrolepis jaj>OIIims TAlC 60 marir1e (Un 1) dually bccon:es rine grained and transits Callia11assa muratai NAG. to On"----- ~ brackish- ~ Shakubctsu Grey siltstone, sandstone, thin conglomera Cor/lieu/a tokudai (YoK.) ... te, intercalated coal seams. Conglomerate 250 terrestrial Batissa sitakaraemis (Suz.) c (li ) 11 contains white volcanic pebbks. Ostrr•a j>raegrat•itesta TAK. brackish- I Dark grey siltstone, platy greenish grey Nemocardium-yokoy(IJiiaiTAK. ~ Shitakara Af;vr greu·iugki MAK. c: sandstone intercalating thin tine grained 200 marine "' (U,) conglomerate. Neptunea sitakarensis MATSUI brackish _ _!-in/Ilia Yf!!_Soensis :\h:o;ATO c:: Yubetsu Greyish sandstone, dark grey siltstone, I Batissa sitakaraensis (Suz.) ;:; reddish conglomerate, intercalating coal terrestrial I Cor/Jicula tolmdai (YoK.) g (U,) 300 ..., sean1s. · • Ostrea pmegraz•itesla TAre 0 1 - --- -· ______I Nemocardium yokoyamai TAK. i Cl (marine ; Tenneru Reddish conglomerate, intercalating greyish Papyridea cfr. harrimanii DALL sandstone patches and thin coal seams. 200 in eastern Alya greu:ingki MAK. c (Ua) , part) '0 ------lVePittnea sitakarensis MAT·---~~I Harutori Greyish sandstone and dark grey mudstone, (U~) intercalating coal scams. 100 I terrestrial Beppo Blackish conglomerate intercalating grey (U,) sandstone patches. 50 1 terrestrial I Species of the genus Neptunea from the Palacogcrw Formations ~03 Table II. Geological Oc..:urrcnc~ I Species u. Nepttmea sp. N. silakarensis MATSUI n. sp. 1-,f-1.__1 __1 N. sltornensis MATSUI n. sp. I ]1{. lmruha/ai 1\]ATSUI n. sp. TAKEDA I- __f __ .~v·. morkstoidea I -1- .. ··----·1 --I N. e;;oana TAKEDA ! I N. subwrinata MATSUI n. sp. i N. rmlwtsuensis MATSUI n. sp. ·-J ]\[, dis par TAKE PA fig. l, on Pl. 29. The present specimen Family Neptuneiclae is doubt lcssly quite unique in its outline of shell. and in this regard easily Genus Nej>lrmea (BoLTEN) separable from all the hitherto known RoEiliNG, 1798 fossil species of the genus .!lleplunea. Genotype: Fitsus antictms LINNAEus. However. it seems to the present writer to be rather closely allied to the shell NePitmea sp. described by B. C. CLAr Occurrrnce :-0,1 : Senposhi. ( >boro other by distinct, more or less canalicu mura. 1\ ushiro Prov .. (Col I. I. HAY Asm) lated sutures. The protoconch is com Repository :-U. II. Reg. No. 12669 !U. posed of one or one and half turns of H.-Dept. Geol. l'vlin .. Fac. sci .. Hokkaido the whorl, which is smooth on the outer Univ .. Sapporo). surface. The other whorls moderately Remarlls:-The only single specimen convex with each other, usually inclis· for this species is at the writer's tinctly but sometimes distinctly should disposal for study. It is illustrated in ered atabout the midpoint of ~he depth; 204 Masaru MATSUI upper surface more or less flattened. shiro Prov.. (l'vli-rAN1's Loc. no. IO\\'L'r surface below the shoulder ,, 226. Coli. K. MITANr) slightly convex and nearly vertical. : Kamishoro, Shoro mura. Ku- The ornamentation of each whorl con shiro Prov. sists of a few spiral ribs, alternating Repositm:v :- U. l-1. Reg. No. 12674, with secondary fine striae; three ribs 12679. 12701. and two secondary striae usually obser Remarlls :-These specimens now at vable on the third whorl, while there hand closely resemble Chrysodomus are four to five ribs alternating with 1·hikuzcnensis NAGAo described and illus the secondary striae on the fifth and trated by T. NAGAo from the Yamaga body whorls. Spiral ribs are usually beds of the Chikuho Coal Field, island narrow, moderately elevated, rounded oi Kyushu. Japan. However. the former on top. and sharply defined from the species may be specirically distinguish broad interspaecs; the uppermost rib is able from the latter in having a shell weakly developed in the fifth and body with the whorl ornamented by secon whorls. which is somewhat more nearly dary spiral striae in addition to spiral disposed to the upper suture; the se ribs. coml one is situated at about the mid 8ucrinmn match~Jarense ~'IAKIYAJ\IA dle of the upper surface; I he third one described by 1\L-\KIYAMA from l'vlatchgar forms the shoulder itself. and the tift h and Yotukura, seems also to be nearly is slightly abO\·e the latter suture. allied to the present form in respect Body whorl is large. bluntly shoulder to the features of upper whorls, but ed, convex at the sides: it becomes gra lVIAKIYAMA's species is genetically dis dually narrow towards the anterior ex tinct from the present form. now under tremity and is spirally ribbed; basal consideration, in its shorter columella. part is ornamented with eight to ten Nept unea oomurai OTUK A shows a I so spiral ribs. which are slightly narrower close similarity to the present form, and weaker than those on the convex especially in its outer form, but former part of the whorl; aperture subpointecl has more numerous spiral ribs on the posteriorly; inner lip excavated; colu whorls than the latter and has fine mella slightly bent outward; anterior longitudinal costae on the post-embryo canal rather short and narrow. nal whorls. Dimensions:- lvTePfrmea slroroensis MATSUI n. sp. !Ieight Max. Diam. Apic Ang. Plate 29, Figures 5a. 5b, 6a. lib. 37mm. 20 mm. 53' 38 .. 23 .. 51' Shell fusiform, with moderately ele 36 21 52' vated spiral whorls. apical angle about " ----" 45°; whods five in number, separated Occurrences:- from one another by a distinct suture. U3: Senposhi. Oboro mura, Kushiro Each whorl distinctly angulaled at Ptov., (Coli. I. HAYASHI) a little above the middle; upper U,: Ponshitakara gawa. Akan surface slightly concave and inclined mura. Kushiro Prov. (MATsm's outwards: lower surface almost flat· Loc. no. 68. Coli. T. FuJm) lened. Ornamentation consisting of On 2 : Takinoue, Shoro mura, Ku- four spiral ribs and numerous fine Species of the genus Nep11111ea fro111 the Palaeogene Formations 205 crowded lines of growth; spiral ribs gate aperture and distinctly angulated rather .flat and broad: two upper ribs shoulder in each whorl. and easily on the upper surface are weak and some separable from all the hitherto known times indistinct; the lower two are species in japan, either fossil or strong and more highly elevated than living. But the present form is akin the upper two: the third located on to Cln:vsodomus a/lispiratus NAGAo which the shoulder itself. while the fourth is was reported by NAGAo from the Doshi situated on the middle of the lower beds of the Asakura Coal Field, Kyu surface; body whorl is large. much sh u, in its shouldered outer form. Yet higher than the spire, distinctly but the present form is also specifically more or less round shouldered, convex distinguishable from the latter in hav below the shoulder and becomes gradu ing a larger shell, and a longer anterior ally narrow downwards; the base is canal. ornamented by ten to twelve spiral ribs which are more crowded than those of Neptunea lmruhatai ·.l\IATsut n. sp. convex parts. Aperture elongate. \vith Plate 29, Figures 7a, 7b. Sa, Sb. rather oblique anterior canal; outer lip thin; inner lip excavated by a thick Shell moderate sized. spire high twisted columella. with more than five rounded whorls besides the embryonal part which is Dimensions:- unfortunately lacking. Entire shell Height Max. Diam. A pic. An g. spirally sculptured. w·horls separated ----- by abutting tlnc sutures, which are 49 mm. 38mm. 47' equal in size and gently elevated. The 65 .. ·10 .. -!4' uppermost rib lies close to the upper 59 .. 38 .. 45° suture, and the fifth one slightly above 48 .. (28) .. 45' the lower suture. There are also two ------or three fine secondary spiral striae Occurrences:- in each interval of the spiral ribs. the U3: Senposhi. Oboro mura. Kushi former become gradually narrower ro Prov. (Coli. I. IIAYASIII) downwards. Aperture rhomboidal in U,: Ponshitakara gawa, Akan form. canal short and slightly recun'ed. mura. 1\ushiro Prov. (l'vlATsUI·s Loc. no. 68. Coli. T. FuJtE) Dimensions:- 11 : Shoro Coal Mine. Shoro muar. Height . 11\lax. Diarn~ Apic. Ang. Kushiro Prov. 11 (62 mm.) upper mm 3 o : 1\.amishoro. Shoro mura. Ku- whorls lost ' 30 · 5 shiro Prov. Repository :-U. II. Reg. No. 12613. Occurrences:- 12675. 12676, 12678. U.,: Ponshitakara gawa. Akan Remarks :-These specimens are cha mura. 1\ushiro Prov. (1\IATSUI'S racteristic in respect to the high spire. Loc. no. 68. Coli. T. FuJII·:) moderately rounded whorls. three to " : Shitakara gawa. Akan mura, five spiral ribs and secondary striae Kushiro Prov. (MATsm's Loc. no. between them on each upper whorl. 33) This form is quite unique in its outer II : Shcno Coall\·1ine., Shoro mura, form especially in its high spire. elon- · Kushiro l'rov. 266 tv1asaru MATsui Repositmy :-U. II. Reg. No. 12670. Remarks :-This form seems to be 1267l, 12691, 12692. quite rare species in Hokkaido; H. Remarks:-This species shows a much TAKEDA described it mainly on the smaller apical angle and possesses a basis of specimens from South Sakhalin, much higher spire than those of any and single specimen collected from On, hitherto known japanese species belong in Kushiro coal field. ing to this genus Neptunea. Further The writer was also able to examine the features of aperture and canal of only five specimens for this species the present species are chrysodomid. collected from U, and On 3 in the Ku Neptunea landesi (TEGLANo). described shiro coal field. Although the surface by C. W. WEAVER from the Tertiary ornamentation of I he hololype of this formation of the western coast. North species was unobservable from its poor America. is somewhat all i('d to the pre preservation and the anterior parts of sent species in respect to the high spire the body whorl are lacking. the illu· and small apical angle. but the former strated specimens in this paper show has a heavy revolving keel on the post characteristic numerous fine spiral erior whorls. and such features are striae to cover the whole outer surface wholy absent in the latter. of the shell, and the aperture ·to be elongated. while the canal is slight Nept unea modest oidea TAKE uA ly recurved. Neptunea hobetsuensis IIAYASAKA and Plate 30. Figures Ia. lb. i\fATsut is doubtlessly allied to the pre 1953. 1Veptun£'a modus/oidea, TAKEDA, Studies sent form. but whorls of the former on Coal Ceo/., No. ::J, pp. 53-5-l, Pl. III, are more highly convex than that of . figs. 1-7. the latter. I he spiral ribs of the former increase in according with its growth Shell moderate in size. fusiform, with stage. but in the present species the high spire, about six well-rounded number of ribs is almost constant. whorls. surface ornamented by five to six spiral ribs and many fine striae on and between the main threads. Aper 1Vept unea ezoana TAKEDA ture elongated and canal slightly !'late 30, Figure .J. recurved. 1953. Neptzmea ezoaua. TAKEDA, Studies 011 Dimensions:- Coal Geo/., No. 3, pp. 52-53. Pl. II. figs. 1, 3 & 6. Height i Max. Diam. I Apic. Ang. - - ---~- -- Orif.{ina/ Description (TAKEDA 19:13): (3~) mm.) upper~· 3G mm. 55" whorl lost "Shell moderate, fusiform, rather thin, (53 " ) .. I about 50' high turreted. spire same or higher than aperture; apex subacute. apical Occurrences:- angle about 52°: whorls 7, convex but V5: Ponshitakara gawa. Akan roundly shouldered. which is distinCt mura, Kushiro Prov. (l'VIATsut 's on middle whorls. each whorl separated Loc. no. 68, Coli. T. FuJm) by distinct suture. Ornamentation con On3 : Nuibetsu. Shiranuka mura. sists of '1 spiral ribs (on fourth and Kushiro Prov. ~ixth whorl) with numerous crowded Nepository:-V. H.Reg. No. 12672, 1269,!. growth lines; body whorl large, inflated Spccies of the genus NejJ!wwa from the Palaeogene Formations 207 but abruplly tapering towards end; are ornamented with thirteen or four· canal rather short. slightly curved. teen ribs and numerous weak spiral Spiral ribs narrow, elevated. sharp; striae between the main ribs on the third rib strongest and situated on body whorl. The aperture of them is shoulders. Sometimes a fifth rib appears moderately wide, outer lip is thin, inner nearer to next suture. At the last whorl lip is excavated by thick tested colu 10 ribs and one or two short perceptible mella, canal is narrow and notched ones on siphonal margin of outer lip. anteriorly. Secondary feeble ribs sometimes appe· This species somewhat resembles N. ar bet ween each of the main ribs and onbetsucnsis l\IATsvt but the former is the new ones are near to the upper specifically distinguishable from the suture. In this case the total number latter by its less convex, smaller body of ribs is 8, but the four main ribs whorl. and by its four strong and one strongly on internal mould. feeble spiral ribs. Space between upper suture and N. oomurai Onn Dimensions:- Neplunea subcarinata l'VlATsut n. sp. Pbte 30. Figure~ 2, 3a, 3b. llcight Max. Diam. 1 Apic. Ang. (65 mm.) apex 43mm. 52° Shell strong, solid, ovalo-fusiform. and extremity whorls about six. Each whorl convex lost and prominently shouldered. Th.e up ) 46 55;> (? " " per surface of the whorls flat or gently ) 56 51' (92 " " concave. ornamented by three weak ) 55 ~3' (95 " " spiral ribs. The fourth rib. at shoul der itself. strong and prominent. Lower Occurrences:- surface of the whorl nearly vertical. U,,: Kamiatsunai. Otsu mura. To· The fifth spiral rib almost mid-point kachi Prov. (Coli. Shoichi NisHt· of the lower surface. On the fourth oA) and fifth whorls, there are four or five On,: Takinoue, Shoro mura. Ku· fine feeble spiral striae between each shiro Prov. (MJTANI's Loc. no. main ribs. Suture distinct. Aperture 226) medium in size, ovate. angulatcd above; " : Teshibetsu gawa. Teshibetsu outer I ip distinctly angulated by the mura, Kushiro P!tlV. (lVL<\.TsuJ's carination of the body whorl. Canal Loc. no. 138, Coli. T. FunE) _short, wide. turning to the left, ending Repository :-U. H. Reg. No. 12680, in a well-marked notch. 12G87, 12G88, 12700. Occurrences:- Remarf,•s :-Only four specimens of On1: Kamiatsunai. Otsu mura, To· this species are available to the writer. kachi Prov. (Coli. J IsHII) They were collected from U, and On~ On,.: Kamishoro. Shoro··mura, K u· in the Kushiro coal field. All of them shiro Prov. 208 Masaru MATSUI The outer surface sculptured by three, Height !Vlax. Diam. [Apic. •\ng. rather broad, moderately elevated, flat --- 55mm. 60" topped ribs; of them, uppermost rib ( 42 .. ) upper 30 mm. 61" lies on the shoulder itself. The body whorl lo::;t whorl is ornamented by about ten to (47 .. ) " 30 61'' twelve strong spiral ribs. increasingly (36 " ) " ~8 561) densely arranged towards the base of (53 " ) " 3i 60" the shell. Each whorl has numerous finely crowded growth lines on the On~: Teshibctsu gawa, Teshibetsu rather broad interspaces of the spiral mura, Kushiro Prov. (MAT:mr's ribs. Suture distinct; aperture large, Loc. no. 148, Coli. T. FuJm) ovate in form, angulate above; total Repository :-U. H. Reg. No. 1~681. length of the aperture plus canal reach 12683, 1268:1, 12685, 12686. es more than half the length of the Remarlls :-These sharply-keeled speci shell; outer lip expanded outwards and mens may be perhaps specifically regularly curved. not distinctly angula identical with the form described by ted by the carination of the body H. TAKEDA under the name of Nept unea whorl; inner lip excavated by thick subantiquata MARToN and RAcKETT from twisted columella, which is rather short Rosukezawa south Sakhalin; neverthe and slightly bent outwards; canal short, less they are doubtlessly distinct from wide. more or less strongly turning to the species Neptzmea subantiquata MAw the left of the aperture. TON and RAcKETT, now living in the Dimensions:- sea around the circum-polar region, by their more distinct shoulders and three Height Max. Diam. Apk. An g. ------spiral rils on the upper surface on each 85mm. 52 mn1. 5'1" whorl. However N. interscu/jJta describ 8() 59 56' " I " ed by 1-L"-Rl\IER seems to be somewhat 55" (86 " ) upper 6~ " allied to the present form but for the whorl lost 102 I 58 56" fact that the former has more convex " " whorls and conspicuous secondary spiral (86 ) upper 58 " 56" whorl & striae. extremity lost 83 56 .. 58" Neptunea oubetsuensis l\lATsur n. sp. " Occurrences:- Plate 30, Figures 5, 6a, Gb. On,: Kamiatsunai. Otsu mura, Shell strong. solid. ovato-fusiform, Tokachi Prov. (CoiL ]. lsmr) spire comparatively high; whorls six On~: Takinoue. Shoro mura, Ku to seven, round shouldered; the last shiro Prov. (l'vlrTANI's Loc. no. ventricose about two-thirds the total ~66, Coli. T. FuJrE) height of the shell: spiral angle 55°. II Teshibetsu gawa, Teshibetsu Explanation of Pbte 2 Figs. la, lb. Neptunea sp. Figs. 5a, 5b, 6a, 6b. JVeptunea shoroensis n. sp. Figs. 2a, 2b, 3, 4. Neptunea sitakarensis n. sp. Figs. 7a, ib, Sa, 8b. 1'-leplunea lmrulratai n. sp. MA.Tsur: Palaeogene Mollusca Plate 29 S. KuMA.No pohto. Species of the genus Neptunea from the Palaeogene Formations 209 mura. Kushiro Prov. crviATSUI'S rounded, but on later whorls usually dis Loc. no. 1·18) tinctly showldered at about mid-point of On~: Kamishoro, Shoro mura, Ku the depth, with upper surface flattened, shiro Prov. slightly convex and gently sloping and Repository :-U. H. Reg. No. 12695. lower surface nearly vertical, rather 12696, 12697. 12698, 12699. concave on inner side. Ornamentation Remarks :-So far as the writer is consists of numerous spiral striae. a ware, this form is specifically distin strong and weak irregularly mixed, guishable from all hitherto known usually about 11 on upper surface of species of this genus by its large con the whorl. In addition to these spiral vex body whorl. three strong spiral striae, each whorl i;; ornamented by ribs on the upper whorls and rather many tubercles, about 12 on last whorl. short bent canal. Tubercles sharp, pointed, situated on The specimens now at hand are rather shoulder itself but becoming indistinct closely akin to Neptwzea ezoana TAKEoA. nearer to mouth and. on the contrary, collected in association with the former; one strong spiral rib running on that however the present specimens have portion which coincides with the middle shells more convex in larger body part of the wall. Extremity of canal whorl, with three strong spiral ribs, chrysodomid. Lower half of body besides, the former have generally whorl ornamented by a few rather larger shells than the latter. strong spiral ribs." N. oomurai 0TuKA is also another Dimensions:- species allied to the present form in respect to the outer shape. but the Height i Max. Diam. 1 /\pic. Ang. I I preceding species has weak spiral striae -Tl6 ml1!:) - ---- apex 14 mm. 62, on the whorls besides the ordinarily & extremity lost strong ribs and a more faint suture. (2•1 ) 20 56' Clzrysodomus modes/us KuRoDA, descri· " bed by KuRoDA from Nagano Prefecture Occurrences:- seems to be akin to this new form, hut On3: Nuibetsu, Shiranuka mura. it has a lower spire. and is ornamented Kushiro Prov. with numerous spiral ribs. ? : Exact locality unknown. (upper tributary of Charo gawa, Shira nuka mura. Kushiro Prov. (Coil. JVeptzmca dispar TAKEDA Koya HIRANo) Plate 30. Figures 7a, 7b. Sa, 8b. Repositmy :-U. H. Reg. No. 12677. 12689. 1953. Neptunea tlispar. TAKEDA, Studies mr Remarks:-The specimens minutely Coal Geol., no. 3. p. 55. Pl. I. figs 2. 4, examined by the writer were collected 8-1:~. from On 3 developing at Nuibetsu and Original Description (TAKEDA 1953): upper tributary of Charo gawa (exact "Shell medium. broadly fusiform, with locality unknown). Small shells are high spire which is shorter than aper somewhat broadly fusiform. with only ture and abruptly decreases in diameter four whorls besides the embryonal upwards; whorls 5 or 6, separated by whorl which is unfortunately lacking. distinct suture. Early whorls convex. Spiral striae about thirteen on upper 210 1\ilasaru MATSUI surface of each whorl. Tubercles about No. 2, pp. 165-166, pl. VII. figs. 56. 57. fourteen on last \Vhorl. Lower surface l\IATSUJ. M .. HuRUIIATA, Y. and Fu;m. T. of the body whorl is ornamented by a (1953). Geology of Yuhetsu Coal Mine distinct secondary keel with twelve or Area, Kushiro Coal Field. Bull. Geol. Com. thirteen weak tubercles. Except the Holdwido. No. 22. l\hNATO, M .. MATSUI. lVI., L'ozm.ll, S .. HURU· different number of tubercles and the IIATA. Y .. FUJIE, T. & HAYASHI. I. (1952). existence of a rather distinct secondary 1Nann crschicncn die Poronai Faunen zum keel in the present specimens. they are crstcnmal ? Proc. japan ..lead.. Vol. 28. doubtlessly similar to the holotype of No./. this species. MITANJ. K. & Fum-:. T. (195·1). Geology of Taldnouc Area. Shorn mura, Kushiro Coal Hcfcrcnccs Field. Bull. Geol. Com. Hollkaido. No. 27. NAGAO, T. (1928). Palaeogene Fossils of the CLARK. B. L. (193~). Fauna nf the Pout :1nd Island Kyushu, Japan. Part II. Sci. Rep. Yakataga Formations of Southern Ala· Tohoku Unit•., Ser. 2, Vol. XII, No. 1, p. ska. Bull. Geol. Soc. :1mcr.. Vol. 43, pp. 108 (99). pl. XVII, figs. 10-12; pl. XV liT. 830-831. pl. 20, fig. 13. figs. 13. 13a. l-IARI\IER, F. \V. (191-1), The Pliocene Mollus· 0TUKA. Y. (19-!U). 1\Iioccnc Mollusca from ca of Great Britain, Vol. 1, pp. 163-lli,!, Teshio Prnv., Hokkaido, Japan. japan. pl. XVII, figs. 6, 7: pl. XXV. fig. 2, p. four. Geol. Geogr., Yo!. XVI!, Nos. 1-2, p. 166, pl. XVIII. fig. 5: pl. XXV. fig. l. 98. figs. 5, 6. l-IAYASAKA. I. & l\IATSUI, .1\I. (1950). On some TAKEDA, H. (195~). The Poronai Formation Gastropoda from the Momijiyama For· (01 igocene Tertiary) of Hokkaido and mation. four. Fac. Sci., Hokkaido Unil• .. South Sakhalin and its Fossil Fauna. Ser. IV. Vol. I. No . .J, p. 33:!, pl. I. fig. 1. Studies on Coat Ceo/.. No. 3, pp. 52-55, Pl. KuRODA, T. (1930). HOMI\t.•.:s Sinanotyubu I. figs. 2. 4, 8-12; pl. II, Jigs. 1. 3 & 6; Tisitusi. pp. 78-19. pl. 13. fig. 109; pl. 14. pl. III. figs. 1-7. fig. 83. WEAVER, C. W. (19,12). Palaeontology of the MAKIYAMA. ]. (1934). The Asagaian Mol Marine Tertiary Formation of Oregon luscs of Yotukura and rvlatchgar. i1lem. and 'Vashington. Unit.>. Wash. Pub!.. Geol., Col/. Sci., Kyoto Unh•., Ser. B. Vol. 10, Vol. 5, pp. ·127-428, pl. 84, tigs. 7 & 12. Explanation of Plate 30 (All figures arc· in natural size) Figs. 1a. lb. Ncptunea modestoidea TAKEilA Figs. 5. 6a. 6b. Neptunea onbelsueusis n. sp. Figs. 2. 3a. 3b. Neplunea subcariuala n. sp. Figs. Ia, 7b. Sa. Sh. Neptuuea disj1ar TAKEDA Fig. 4. Neptunea ezoaua TAKEDA MATsur: Palaeogene Mollusca Plate 30 S. KuMANo photo. Trans. Proc. Palacont. Soc. Japan. N. S .. No. 30, pp. 211-21G. june 211, 1958 :~:l9. SOl\lE: CAMBRO-ORDOVICIAN FOSSILS FROM TilE TAN'GY ANG OR TANYO DISTRICT. SOUTH KOREA* TEIICHI KOBAYASHI Geological Institute. University of Tokyo Y.~limP.Htl!Jj O)~ll't~~~ I~ 6 : #. :t~-~-.O)l*~/iiJ The Cambro-Ordovician Chosen group still tentative. they reveal remarkable of the Tsuibon zone in the 1\.ogendo resemblances with the Croixan trilobites. Limestone l'latcau is very fossiliferous Berlwia is suggested for lddingsia (?) in 1\angwondo or Kogendo. but becomes slzantzmgensis KoDAYAsHI, as its proper much less so in the Tan'gyang taxonomic position. y ongch ·un (Tanyo-Eishun) District in the southwest and almost unfossiliferous Chosen System of the Tan'gyang in the 1\lun'gyong (Bunkei) District or Tanya District. further in the southwest. Therefore 9. Tsuibon limestone. about 50111. thick, the Tan'gyang collection before hand represented by massive limestone is highly valuable. although it is a containing ormoceroicls (Tanyo 4) small one. not well preserved. I am and overlain by Koten series para greatefull to J\fr. Takuji SmRAKI who unconformably. has given me the collection. Beside 8. Chikunsan shale, 10-20 m. thick. or Hamasltania (?) sp .. three new species dark gray shale containing ormo are described here as follows: ceroids (Tanya 7F). 7. r-.Iakkol limestone, 50-70 m. thick. Kings/onia parallela KoBAYAsm. consists of vermicular limestone at new species the top and thick massive limestone below it. Plet home! opus longispinus KoBAYASIII, new species. 6. Tomko] shale and limestone. 80-110 m. thick. Upper 50 meters compo lddi ngsia orienta/is KoBAYASHI, sed mainly of light gray shale con new species tammg Finkelnburgia saislzoensis (Tanyo 70 and 10) and lower 30-40 Although their generic references are meters of well bedded limestone and *Received Oct. 7. 1956: read at the an· vermicular limestone in alternation; nual meeting of the Palaeontological Society thin quartzite at the base. of japan at Scndai, Feb. I. 1958. 5. Kasetsu group, 500 m. thick, com- 211 212 Teiichi KoJJAYAslll posed of vermicular limestone, marl l.ist of Fossils and bedded limestone in alterna Tanyo •1. 'J 'sui bon I i mestone tions. Small ormoccroid. gen. et sp. Dictyilcs zone in the upper part yields indet. Eom·this shakuotum•nsis (?)(Tanya 5). Tanyo 5. Oictyi/es zone Dictyites longicmula. lddingsia oricn t:uurt his shalmotunensis SuN talis, Hamashania (?) sp .. (Tanyo 7C). Tanyo 7. P!etliometopus /ongispiuus (Tanyo 7E). 7A. Clmangia zone and A"ingstnuia para/lela (Tanyo 9). Clmangia tailiakuensis KoJJA Clmaugia zone in the lower part con· YASIII (f'ygidium) tains C/mangia tai/wlwr•llsis (Tanyo 7B. C'littllllgia zone 7 A). Billingsela pumpc//yi (Tan yo 7B). Hi IIi ugsel!a Jmmpe/lyi \VA v :1. Seison (?) bed, about SUm. thick. COTT composed of quatzite. sandstone. thin 7C. !Jir:tyiles zone bedded limestone and vermicular Dictyitcs longicauda KoBAYA limestone in alternation. sHI (Pygidium) 3. Taiki limestone. •100-500 m. thick. ldclingsia orienta/is KoBAYASHI, or massive limestone with some new species. intercalations of marl and shale. llmnasliania (?) sp. 2. Beiho slate. about 100m. thick, re 7D. Tomko! shale presented by bluish gray to black Finlwlnlmrgia saishoensis (Ko coloured slate, phyll it ic or sandy in BAYASHI) part; thin lenses of w hi tc or pink 7E. J)ictyit es zone limestone intercalated in 3 or .J 1'/et/iomf'lopus longispinus Ko horizons. BAyASHI, new species 1. Sohsan quartzite. 50 to lOU m. thick. 7F. Chikunsan shale white to light gray quartzite con Ormoceroid. gen. ct sp. indet. tammg round pebbles of white Tanyo 9. Dictyites zone quartzite and resting on gray gneiss J\i11gstonia para/lela KoBAYA· of Taihakusan series. s111, new species. Saukid, gen. et sp. indet. Tanyo JO. Tomko! shale Finlwlnlmrgia saislioensis (Ko BAYASHI) List of Localities Tanyo 4. Kich'on-ni, Kumgong-ni. Tae gang-myon, Tan'gyang-kun. Ch'ungch'ong-bukto. !i!J.fff~tin .J'H~ llf> 7dua Iii~ .fr11H£t:t .ffi. Tanyo 5. Ditto. Tanyo 7. Valley in the north of Hyl5n ch'tin-ni. Tan'gyang-mydn, Tan'gyang-kun. Ch'ung ch'ong-bukto. Ca 3 km. north east of Tan'gyang town and Some Cambro-Ordovician Fossils from Tan'gyang District 213 about 1~00 m. west of Surum· san. .' Family Ellipsocephalid:~e MATTHEW, 1881 Subfamily Kingstoniinae 3 4 KonAv,\sHJ, 1!13:1 Ex pl:Jnat ion of Text-figures (Family Plet.hopelt icbe Fig. 1. lddiu~sia orienta/is KoBAYASHI, new species. Tanyu I; X 2 RA vMoNn. 1~nl) Figs. 2a-b. 1\iul:slonia !ongispimts KonA· Genus Kingslonia \V AJ.CoTT. 19~4 YASIII, ucw species. Dorsal and Lateral \'iews: Tan yo 9; X 3 It is a question whether three Wan Fig. 3. l'lethomelopus spiuU'erus I lddingsia orienta/is KoBAYAsHI, Genus Plcthometopus ULRICH. 1931 new species Pie/ hometopus longispimts Text-figure 1. KoBAYAsHI. new species DescrijJtio11 :-Glabella large, convex, Text.figurc 3. conical. truncated in front, and provided Description :-Cranidium subtriangu with two pairs of strong oblique fur lar. but truncated in front. gently con rows; anterior glabellar furrows rudi vex and practically unfurrowed except mentary. and visible as pits only by cross a very shallow occipital furrow: nuchal light: occipital furrow profound: oc spine stout, very long, somewhat angu cipital ring thickened mesially: fixed lated along the axis and more or less checks very narrow; eyes medium in depressed on both sides of its root where size and set close to glabella at its rpid it is well expanded laterally. The length; preglabcllar field gently in· lateral outline is somewhat incised twar clinecl and divided into a fontal limb the mid-length of the cranidium where and rim of subequal length; rim near a small eye may be present. but it is ly Oat: facial sutures diagonally issu not clearly discernible. The facial su ing from eyes; test rough, but non ture appears possibly proparian, but granulose. the specimen is not so well preserved Comparison :-The glabella outline is I hat this nature can be warranted. subsquare in this species. but it is well In the narrow outline of the cranidium rounded in front in I. robusta (WALCoTT) this species agrees better with Steno as well as /. simi/is (W AI.CoTT). The pi/us than 1'/ethomelopus. In the low frontal border is often broader than the convexity of the cranidium and the frontal rim in lddingsia (REssER, 1942). presence of a nuchal spine it is quite It resembles Maladioides in the glabellar distinct from the hitherto known spe aspect. but the fixed cheek is much nar cies of Stenopi/us and more allied to rower. 1'/ethometopus. The spine is, however, Ot'l:urrence :-'L1nyo 7C. unusually long. Arapafloia 1\ltLLER. Hl36, i.e. Hesperaspis SToYANow, 1936. has Genus Berkeia REssER, 1937 such a spine. but the glabella is always distinctly outlined. The facial suture H(?rkeia shant ungensis (KonAY ASHI) is opisthoparian in Ampa/mia, Stenopi/us 1935. fddingsia (?) .~hmztungeusi.~ 1\onAYASHJ, and Plctlmmrtopus. It turns out a new japan. ]our. (,'('{)/. Geogr .. l'ol. 12. p. 25, genus. if its proparian suture be as pl. 6, fig. 4. certained. Occurrence :-Tanyo 7E. In this species the frontal rim is less than half the length of the frontal limb and gently convex, instead of nearly fiat Family Solenopleuridae ANGELIN. 18!14 in lddingsia. In these aspects and others Subfamily Dokimocephalinae it fits in Berkeia. The relatively small KoBA Y Asm, 19:~5 glabella is its important distinction from Some Cambro-Ordovician Fossils from Tan'gyang District 215 American species of the genus. species. Occurrence:-Tsi11aia zone; west of Occurrence :-Tanyo 7C. Tsinanfu. Shantung. References Family Dikelocephalidae l\lJLLEI~. 1887 CLAI~K. T. H. (1924), The Paleontology of Subfamily Saukinae Beekmantown Series at Levis, Quebec. /1u/l ..4m. l'a/., Vol. 10, No. ·11. Uuucu and REssER. 1933 KoBAYASIIJ. T. (1933), Faunal Study of the Wanwanian (Basal Ordovician) Series c;cnus Hamaslumia KoBAY A Sill. 1942 with Special Notes on the Ribeiridae HJ-12. 1/ama.wmia KnBAYASIII. jour. Gwl. Soc. and the Ellesmcrcoceroids. jour. Fac. Sci. japan, Vol. 49. p. 118. Imp. Unir. Tokyo. Sci. 2, Vol. 3, l't. 7. -- (1935 A), The /Jriscoia Fauna of the Insofar as I am aware, ;l1areda is the Late Upper Cambrian in Alaska with closest relative to this genus. They Description of a few Upper Cambrian have similar long multisegmented Trilobites from Montana and Ne\·ada. japan. ]our. GC'ol. (,'teo.f{r., Vol. II. pygidia. but the pygidium of I!. j>uklira -- (193:; B), On the l'hylogeny of Primitive can be distinguished from that or M. Nautiloids wit!~ Description of l'lcc/ro· mulwzegata KoBAYAsNI (19-!2). in its sut: noceras liaolungcl/se, new species and quadrate outline, posterior expansion, Jtltlin~:sia (?) slumlllll.f[ellsis. new species. a smaller number of axial rings. more Ibid .. Vol. 12. flattened pleural lobes. absence of inter -- (194~). Two New Trilobites Genera, pleural grooves and presence of a narrow 1/amas/wnia and 1\'irke//a. jour. Gf'ol. Soc. marginal rim. They are contemporaries. japan. Vol. 49. It is further iwtewort hy that the frag 1\IILI.ER, R. M. (1936). Cambrian Trilobites mentary cranidium associated with the from Northeastern Wyoming. four. Pal., type pygidium or Ilamashania jmlchm Vol. 10. RASETTI. F. (19H), llpper Cambrian Trilo agrees with that of Lichengia onigawara bites from Levis Conglomerate. Ibid., KonAYAsm (1942) i 11 the broad glabella, Vol. 18. strong posterior furrow and especially -- (194!1). Description supplemcnlaire de in the large posterior plapebral lobe. Trois Genres de Trilobites Cambriens. Distribution :-Daizanian or middle Up Cmwd. Natural., Vol. 72. per Cambrian of Eastern Asia (Jehol and RAYMOND, P. E. (1924). New Upper Cambrian ? South Korea). and Lower Ordovician Trilobites from Vermont. Pror:. Hoston S'oc. 1\lat. !fist., Vol. 37. Hamaslumia (?) sp. -- (1937). Upper Cambrian and Lower Ordo· \'ician Trilobites and Ostracoda from Text-figure 4. Vermont. Bull. Grot. Soc. Am.. Vol. 48. REssJm, C.D. (1937). Third Contribution to Though fragmentary, this pygidium Nomenclature of Cambrian Trilobites. is of special interest because it shows Smiths. ,Uisc. Col/., Vol. 95, No. 22. close affinity to the rare species. lfama -- (1942). New UpJJl'l' Cambrian Trilobites. shania pulclzra in the long outline and Ibid., Fol. 103, No. !>. very oblique and fiat-topped pleural SToYANow. A. A. (1936), Correlation of Ari bands. The axial lobe, however. tapers zona Palaeozoic Formations. Bull. Ceo/. more slowly in this species than in that Soc. ilm., Vol. 47. 216 Tciichi KoBAYASHI ULRICH, E. 0. (1931). Trilobites in J. BIHDGE's Ozark ian Tri lobi lcs. Smiths. Misc. Col/., Geology of the Eminence and Cardarcva Vol. 75, No. 2. Quadrangle. Alissouri Bur. Gt'ol. Mines .. -- (1925), Cambrian and Ozarkian TriJo. 2d Ser .. Vol. 24. bites. Ibid .. Vol. 75. No .•1. WALCOTT. C. D. (1924). Cambrian and Lower Trans. Proc. Palacont. Soc. Japan. N. S.. No. 30. pp. 217-219. pl. 31, June 20, 1958 340. .. MONOPllYLLITES" ARAKURENSIS SP. NOV. FROM THE l\fAIZURU ZONE* KEIJI NAKAZAWA Geological and Mineralogical Institute. UniYersity of Kyoto ••u&m0 .. Mouopltyllites" arakureusis n. sp.: {iCJIIllll0ili!!lii/ffiilflC.;IH~~~r.~bt'l. ;i5 jtl(l @i)> ~.>/ml..d~ Monophyllitidac I<::.Jill"t" J., 1rUt:i 2 fiJ!O),l[]il~~ l.; ~~" C. 0)1t(jt:jl;l: Neo·Trias .a_.7f;T t 0) c !.!J.bt1., Meso· Trias the Arakura formation is considered to Geological Note be younger than the Zohoin gruup in Shikoku, the type of Fujinohiran. which The Arakura formation consisting is characterized by an undoubted late mostly of shales and sandy shales more Ladinian faunule composed of Protmchy than 70 m thick is distributed in small ceras aff. arche!aus (LAulm), 111onophyl!itrs patches at Arakura and Kongoin. l\hi sp .. Daonella lwtoi MoJsisovics. D. saka zuru City, Kyoto Prefecture. It is over wana MoJ., etc. On the other side, the lain disconformably by the Sakawan ( ·. Arakura formation is evidently older Carnian) Nabae group, and is assumed than the superimposed Sakawan Nabae to be in fault-contact with the Permian group. From these facts the writer re Maizuru group. The Arakura contains cently proposed the Arakuran age be some marine animal fossils such as tween the Fujinohiran and the Saka '' JUonophy!lites" aralmrensis sp. nov .. wan**. This article treats with two Monoplzyllites ? sp. indet., Halobia ? sp., species of ammonite among the fossils Palaeoneilo sp., Nucu!opsis (Palaeonucu!a mentioned above. ?) sp., Lima sp., Psioidea spp. a, fl, Spiri ferina sp., gastropods and bryozoans. As wi II be stated below, "Monop/Tylliles" Description of SpecieH amkurensis and M.? sp. suggest the Carn Ammonoidea ian age of this formation rather than Ladinian. Furthermore. Psioidea sp. a Family Monophyllitidae SMITH is closely related to the Oretian (=lower Carnian) P. conjuncta HEcToR from New Genus .~1onoph)'llites. 1\IoJsJSOVJcs Zealand. From these fossil evidences ** NAKAZAWA, K. (1958): On the Triassic * Received Oct. 5. 1957; read at the 67th Arakura formation and a proposal of the Meeting of the Palaeontological Society of Arakuran Age. Earth Science (Chik)?l·lwgaku). Japan, Sept. 28, 1957, at Kyoto. No . .16. 217 218 Keiji NAKAZAWA the specific characters are not fully " J1onophyllites " arakurensis known. The partly preserved suture-line is more developed than in jl,!onoplzyllites NAKAzAw A, sp. nov. s. s .. and its general aspect is much simi Plate 31, Figures la-d, Tcxt·figure I. lar to that of Mojsvarites. especially, the lower Carnian Jill. eug_vms (ro.'foJsl Dia~:nosis :-Shell large in size, rather sovlcs) (SPATH, 1934, p. 310, text-fig. lOS evolute. Whorls compressed. elliptical. a). However. the species under conside with a little convex flank and arched ration is easily distinguished from the venter. Surface covered by nearly latter by fairly strongly developed orna straight radial striae growing stronger ments, inasmuch as Jl1ojs1oarites has a towards the ventra I and developing nearly smooth shell. In this point the into distinct ribs on the periphery, species is somewhat similar to 1\fmzopliy/ where the ribs seem to be projected fites s. s.. but differs in the stronger backward. Suture-line monophyllic. sculptures, especially, on the periphery. deeply intended and more subdivided The backward projection of the ribs than in Afonopliyllites s. s .. reverse to the striation of Monophy/liles may have been caused by secondary deformation, and the radials are suppos ed to be nearly straight on the venter as well as on the flank. This species undoubtedly belongs to a new genus in Monophyllitidae, an offshoot from Monophy//iles-stock, but it is tentatively placed in Monoplzy/liles, because the Text·fig. 1. Reconstructed suture·linc sample is too imperfect for establishing of " Alonopltylfiles" arakurensis n. sp. a new genus. The advanced suture line and developed ornament suggest Rcmad?s :-As the specimens at hand its age be Nco-Triassic. are imperfect and, further. strongly Occurrrnce :-From the Arakura forma crushed by later crustal movements, tion at Arakura, Maizuru City. Explanation of Plate 31 Figs. la-d. "Mo11ophyfliles" arakurensis NAKAZAWA n. sp. la. Holotype (]M. 10456). clay cast of the external mould, lateral view, the Arakura formation at Arakura, Maizuru City. X 1. lb. External cast of the outer volution and internal mould of the preceding volution with suture-lines, the same specimen, lateral view. X 1. lc. Restored figure of the same specimen. x 1;a. ld. Excentric cross·section of the same; the shell has been crushed and partly detached near the venter. X 1. Figs. 2a-b. ]l,fonop!zy/lites ? sp. indet. 2a. Fragmental external mould (JM. 10457). Loc. ditto. X 1. 2b. Internal mould with a part of suture·line of the same specimen. X 1. All illustrated specimens are kept in the Geological and Mineralogical Institute, Univer· sity:or Kyoto. Plate 31 NAKAZAWA: Monophyllites A B /,.--- ...... , A / " I ' I I ' \ I \ f \ I I I I 1 lc I I \ I I \ " \ I \ I \ I " ' lb "Monoplly/lites" arakurensis sp. nov. from the Maizuru Zone 219 Age :-Arakuran (earliest Carnian or typically of Mmzophyllites s. s., the Ladi no-Carnian). strongly intended lateral lobes may in Reg. No. JM. 10456. dicate the more intimate re'lation to the preceding species or Mojsvarites. The specific comparison is, however, MonojJ!ty!lites ? sp. indet. almost impossible because of the imper Plate 31, Figures 2a-b. fect state of preservation. Occurrence and Age :-ditto. A fragmental outer and an inner Reg. No. JM. 10457. moulds are in hand. The surface is ornamented by slightly sigmoidal growth striae like Monophyllites s. s. Ueference The suture-line, though very imperfect, SPATH, L. F. (193·1), Catalogue of the Fossil shows monophyllic characters. and is Cephalopoda in the British Museum highly intended. (Natural History), Part 4. The Am Although the surface striation is monoidea of the Trias. 220 PROCEEDINGS OF THE PALAEONTOLOGICAL SOCIETY OF JAPAN re*,fJ'4~f6J·1~ 1957 *k~J 195SiJ! 2 J'.l1 e Wataru HASHIMOTO and Saburo KANNO Jil[:ft:k?f! .'!~··r.l-lll.ttl!TI~'Fri1:~~Y.1X~n;:mt '"l mHm 15. {Jilt1U!XJ:Fllm~J111 Pectinidae; .IC()) 13, t.-t.:(~~~·31::V,). 1957if4H 6 B0B;;f;:.ttfl'l';("f: Pecten (Patinopectell) pamplebejus No· ~t®~l~~t '"l*~~ ~lnt0·Y:~ t T;:, L. !::.iJ;J¥;. MURA and I-IATAI ...... 1\oichiro MASUT>A &3~~0~. *~kM&UW~m~0~~-~ 16. ~tQ~Jtlif~iJ'.; 0.) Palinoj>ecftm inumm· ;;f.;~f®i'zli:. l.if.p I) • 'l!!i.mO)f/i*L tl."$: itJiJt L- f.:o rai MAsUDA n. sp. It-:>~ '1:' ...... t~t;. 1J'i'zl<:..fitlt-:. mwm :M;o:~e.. mMm8t:tlX0 ...... Koichiro MAsUDA iiJil)~.tJ;:,o 17. Orientation of Pelecypodal Fossils 1. Pseudosclul'lr~eriua milurranoensis, a new (Part 1) ( ft,i;;;) ...... Permian Fusulinids and its Growth ... Shigeru AoKr and Takaichiro OMORI and: Form ({~;h~) ...... Sabu ro AKAGr 18. Some Cambro-Ordovician Fossils from 2. Fusulinids from the Funafuseyama the Tan'gyang or Tanya District, South Limestone: Part 2 ({~,fn;) ... Hisayoshi I Go Korea ...... 'J'ciichi KonAYASIH 3. :ltm.iillffli!Jj/H;,pf.H H * ~~i 1: f:<1 ~ -tz 55: au (19581f:2fJ 1 E*-\~1;: "'Ci!l!iE) ~1* *~'i El *r'l~iffJ~f.~ t t) ') Q ~n~ *~lil't~!JfJ~~jJ: cY c. tw:oo(,f,JJ 7.>.h'i~H0iffi~~=>.tu'-'~lH.>ilto0~ §f!'~ t ~,r- 7.>, ~3* *~'im 2 %:01Jrt~~~-:t o t.:~~O)~*H1?" 1. ~ila.:C O)/:b'J>O)I:fjJl&¥J0Thfj a 2. ~~.t~/P!~0UtH!lt~ 3. 1'.&0t.:~0Um~ • ;\l/iiiiliH01i:iJ,0IJIH!Il. 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''1-~IH 9 •J -:~ 'J r:.:~f~l'l:!it:H'f~-~ oo 3. h;{m 1958 ~ ~~. fF~ 1958 fF 12 R 6. 7 13 I 1958 ±F 11 FJ 15 13 I ***!Y I I 1 9 5 8 ~ 6 J..l 12 u r=11 !Jill 1 g 5 s :tF 6 B zo D :ffl ri ;E {lffi 1 $ 250 U11 J!Vi( * ~ mr ~fill J1!!~~ Hcgulations for Publication in Transactions and Proceedings of the Palaeontological Society of Japan 1. Manuscripts considered for publication should have been read at the General Meeting or the Ordinary meeting of the Palaeontological Society of Japan. 2. Manuscripts shall be written in European language, they should be typed on one side of standard-size (22.5X27.5 em) paper and double-spaced throughout. Biological names should be in italics and be underlined by the author. 3. Manuscripts (including of text-figures, maps and tables) will be limited to 8 printed pages (less than 18 type-written pages). 4. Illustrations will be limited to one plate (14.2X2U.U em). 5. 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