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Transactions and ProceedinJ!s of the Palaeontological Society of Japan
New ~eric::; No. ;{(i
l'alaeontological Society of japan
November 30, 195~1 CONTENTS
TRANSACTIONS Page 371. On Two Specie~ of Polymc:;oda from the T.:tori Group in the Ilida
lVIountainlancl. Central japan...... Shiro l\1AEL>A 157
On Some Marine Miocene Mollusca from Mie Prefecture, Japan ......
...... Yoshio AHAKI 161
373. Taxodonta and Isoclonta from the Jura~sic Soma Group in North japan.
Minoru 'LnwRA 168
314. Two New Permian Corals from Yarr.aguchi Prefecture .
...... Michihiro KAWA?\U un 375. Electron-Microscopic Fine St ructurc of Fossil Diatoms. VI. Stereoscopic
Observation ...... Haruo 0Ku:xo 185
PROCEEDINGS ...... 192
President: Teiichi KoBAYASHI Councillors: K iyoshi AsANo, l:{iuji ENvo (Publication), Seido EN no, Haruyoshi fuJI· MoTo (Treasurer). Shoshiro liANZAWA, 1\otora IIATAI. lchiro IIAYAsAKA, Kazuo
HuzioKA. Nobuo IKEBE, Jiro l\lAKIYAMA, Tatsm·o MATsUMoTo, 1\lasao l'VIINATO, Tukio SmKAMA (General Affairs), fuyuji TAKAt (Editor), l:{yuzo ToRIYAMA Secretary: Tetsuro IIANAI
A::;::;istant Secretary: Takeo IcmKAW A
All Connnunical ions relating to this .Journal should be addressed to the PALAEO.l\TOLOGICAL SOCIETY OF JAPAN c;cological Institute. Faculty of Science, Univcrsit~· of Tok~·o. ,);.pan Trans. Proc. Pal. Soc. Japan. N. S., No. 36. pp. 157-160, pl. 17, Nov. 30, 1959
:r11. ON TWO SPECIES OF POLYMESODA FROM THE TETORI GROUP IN THE HIDA 1\IOUNTAINLAND. CENTRAL JAPAN
S!-IlRO l\fAEDA
College of Arts and Sciences, Chiba University.
mWrfJ:itl!OYJ·JfXIr'lllfi!E Polymesoda 2 ftll: d!Fr~ I-.'i<.t:tlliJ~:Ill!~il· ':)~Hilt., t~ ~ 2 f It has already been reported by T. The Tochio alternation is provided KA~'"' and S. 0HoT:\ (19-l9) that the with a remarkable reddish or greenish Tetori group of the Kamitakara district. tuffaceous rock facies as is widely known Hida mountainland. Gifu Prcf .. central from the Cretaceous deposits in and Japan, contains a non-marine molluscan around Japan. l'vloreover. the fauna now fauna with some plants. In 1957 the discovered resembles closely to those of writer collected newly such fossils as the Ryoseki and Y osh i mo formations Polymesoda (Paracm·bicula) sanc/mensis which are ascertained to be Eo-Creta (YAnE and N,,<;,,o), P. ([sodomella) koba ceous in age. Judging from these facts, yashii MAEDA n. sp., '' Jlrfelanoides" sp., it may. be better to assign the alterna ··Pita" sp. and so forth. tion to the Eo-Cretaceous rather than The stratigraphical succession of the to the,upper Jurassic as generally con· Tetori group in the central part of the sidered. From the palaeogeogr~phical Hida mountainland is tabulated below: point of view. the discovery of the Ryo Akaiwa jTochio alternation of sandstone seki element from the Hida mountain subgroup and shale (about 600 m. thick) land is extraordinarily important, be Itoshiro JTaic alternation of sandstone cause the so-called Ryoseki fauna was subgroup 1 and shale (200-500 m. thick) hitherto unknown from the inner zone Sugizaki sandstone (150-200 m. thick) of southwest Japan except the Yoshimo Kuzuryu Numamachi alternation of sand- area in Yamaguchi Prcf. subgroup stone and shale (150-350 m. thick) Among the non-marine shells obtained jTancmura conglomerate from the Tochio formation the two (250-500 m. thick) forms of Polymesoda which are specifi In the Kamitakara district the group cally determined will be described in developed along the upper reaches of the following pages. the Takahara River consists only of the Before going to describe, however, the Tochio alternation, being inserted by writer desires to acknowledge his in faults into the metamorphic and non deb~edness to Prof. T. KonAYASHt of metamorphic Palaeozoic basement com Lniversity of Tokyo and Dr. K. SczuKJ plexes. ot the Research Institute for Natural Resou-rces for their constant guidance Received Nov. 27, 1958: read April 28, 1958. in the course of this study. He is also Iii I 158 Shiro lV!.4ED;l indebted to l\lr. T. HA:o.IADA, a postgra Adductor scars situated close to the duate student of University of Tok)To, extremities of the laterals and faintly for his kind advice in the field survey. impressed. Pallial line simple. Inner side of the shell smooth. Description of Species jvfeasurements :-4 type specimens scarcely deformed measure in mm as Family Corbicu J iclae listed below Genus Polymesoda R.-\FI:-oEsQt:E, 18~0 Subgenus Isodmnella KoaAYJ\SIII . Numb~~-Lcngth Height Width and Suzt.:KI, 1939 1 (Left. I holotype), 60 4-1 10x2 Polymesoda (lsodomella) lwbayashii 2 (Right)' 60 4() 1UX2 l\-f.o\EDA, n. Sp. 3 (Left) I 45 37 7x2 4 (Left) 34 30 5x2 Plate 17, Figures 1-11. ~~- -~------Description :-Shell large in size, t rian Locality and formation:-The bed of gular in outline, somewhat longer than the Kashiwate River, a tributary of the high, inequilateral. moderately short Takahara River, in Kamitakara-mura. and well round in front, obliquely pro Yoshiki-gun. Gifu Pre£.: Tochio alterna duced behind. fairly inflated but more tion of sandstone and shale in the i\ka or less impressed in the median portion iwa subgroup, the upper division of the of the disc; test thick. Postero-dorsal Tetori group. margin scarcely curved ncar the beak. Remarh :-The specimens at hand re fairly long, straightly sloping into the semble the figures of Polymesoda ![sodo posterior: posterior margin very short, mella) shiroiensis (YAn~: and' !\.-\G.-\o) rapidly bent forward into the ventral given by H. YABE, T. NAGAO and S. at an acute angle: ventral margin fairly Sm:-uztJ in 192() from the Cretaceous long, arched, gradually going over into deposits in the Sanchu graben of the the well rounded anterior: antero-dorsal Kwanto massif, central japan. and by T. ma·rgin concave, gently arcuated. Umbo KoaAY.\SIII and K. SuzuKI in 1939 from comparatively large, located at a point the Eo-Cretaceous Yoshimo formation in about one-fourth across from the an the inner zone of southwest Japan. but terior extremity, incurved and directed they are easily distinguishable there forward. somewhat elevated above the from by having the beak situated more hinge-margin. Posterior ridge promi anteriorly and by being much larger in nent: posterior area impressed, lanceo size. late. Surface ornamented with concen This species is also related to P. (!.) tric growth lines and sometimes with naumanii (N'Eu~IAYR) figured by E. Ku:- slightly elevated wrinkles. Hinge-plate 1\IA:-.:>~ and 1\l. NwMAYR in 1890 and by rather large: ca!·dinal teeth three on H. YAn"· T. NAGAo and S. S11nnzu in each valve. middle and anterior cardinal 1926. but they differ from each other teeth strong: lateral teeth two, smooth: in features of the posterior ridge and posterior one slightly curved inward, outline of the she II. Though P. (l.) long, lameller, parallel with the postero kueichouensis (GHABAu) described in 1923 dorsal margin : anterior short. by A. W. GR,\BM; from the Cretaceous 371. Polyrnesoda frm1z" the Tetori Group deposits of China shows some resem what projected above the hinge-margin. blances to this new species in general Surface ornamented with concentric characters, the two species do not coin growth lines. Hinge well deYeloped; cide in ratio of height to length. cardinal teeth three on each valve. two The specific name is cleclicatccl to Prof. of them usually strong; lateral teeth Teiichi KoaA nsm who kindly adviced curved, crenated ; posterior one longer the \\Titer through the study of the than the anterior. Adductor scar lan historical geology of the jurasso-Crc ceolated ovate; posterior one su bovate taceous Tetori group. in outline, distinctly impressed especial ly on its inner margin: posterior one Subgenus Pnmcorbicula KonAYASHJ broader than the anterior. Pallial line and SuzuKI, 1939 deeply sinuated. Inner side of the shell smooth. Polymesoda (Paracorbicu!a) smzclmensis J!easurements :-More or less broken ('{ ADE and NAt;.\o) two specimens selected from the collec Plate 17, Figures 12-16 .. tion measure in mm. as follows: 1Y:?6. Corbicula (Veloritina ') sanchuensis YA· :\umber i Length Height Width BE and NM;.\o, Sci. Rep., Tolzoku Imp. Univ., 2d Ser., Vol. 9, pp. 53-54, pl. 12, 1 (Left) I 3l 32 10x2 figs. 8, Sa, pl. 13, figs. 8-10, 17, 17a. 2 (Right) 16 4x2 1939. Corbicu/a sanchue11sis, KonAY.\SHI and SUZL'Kl./atxm.four. Geo/. Geogr., Vol. 16, Locality and formation:-The bed of .l•los. 3-4. pp. 221-222, pl. H, figs. 10-15. the Kashiwate River, a tributary of the l!H9. Polymesoda (Paracorbicula) sanclwensis, Takahara River, Gifu Pref.: Tochio al· SFZt:KI, japan. ]our. Geol. Geogr., Vol. ternation of sandstone and shale. 21. Xos. 1-4, p. 119. Remarks :-Several imperfect speci 1955. Polymesoda (Paracorbicula) cf. sanclm· mens were found in the collection. ensis. Y A~L\GIWA, !liNn. Osaka Unit·., \Vith regard to the covexity and outline Liberal Arts and E'duc., No. 3. of this species. T. KonAYAslll and K. Description :-Shell medium in size, SvzcKJ (1939) had stated that minor subcircular in outline. nearly as high points of these features are not the as long, inequilateral. well rounded in same in every specimens, though the front, fairly long and well rounded be change from one to another is gradual. hind, with the maximum convexity The specimens at hand resemble most located close to the umbo; test thick. closely to YABE and NAG.-\o·s form illus Postero-dorsal margin more or less trated in fig. 8 on Pl. 1~ of their report. straight. sloping into the posterior with but they slightly differ from the form out making any angle: posterior margin shown by YAnE and N.\GAO as fig. 9 on fairly long, feebly truncated, bent for Pl. 1:~ in outline of the shell. The pre ward with an obtuse angle; ventral sent specimens are also allied to Kon.>.· margin long. very broadly arched, gra YASHt and SL'ZL'KJ's specimens. but the duaily going over into the anterior former are generall~T thider than the margin, which is gently curved: antero latter in width. Nevertheless, none of dorsal margin well rounded. Umbo ·these minor differences seems to have large, located anteriorly, slightly inflat a value for specific distinction. ed, incurved. directed forward, some- 160 Shiro MAEDA KoBAYASIII, T. and Sl'ZUK!. K. (1939), The References Brackish Wealden Fauna of the Yoshimo Beds in Prov. Nagato, Japan. Japan. four. GRABAU, A. W. (l923a). Cretaceous Fossil~ from Shantung. Bull. Geol. Sun•. China, Geol. Geogr., Vol. 16. Nos. 3-4. Fol. 5, No. 2. 1\L-\EDA, S. (1958), Stratigraphy and Geolo GRABAt:, A. W. (1923b), Cretaceous Mollus.:a gical Structure of the Tetori Group in from North China_. Bull. Geol. Sun•. the Hida Mountainland. (in Japanese). China, Vol. 5, No. 2. four. Geol. Soc. Japan. Vol. 64, l\ro. 755. GRABAU, A. W. (1923c), Contribution to the KAt'~J.-\1';:"1, E. und Nrw~JAYR, M. (1890). Fauna of the Kweichow Formation of Zur Geologie und Palaeontoloige \·on Central China. Bull. Ceo!. Sun•. China. Japan. Denkschr. 11Iath. Natur. Classe Vol. 5, No. 2. 1\ais. 1lkad. Wiss .. Bd. 57. Sczi:Kr, K. and 0YA~IA, K. (19·13), Ueberblick KAMEr. T. and OHOTA, S. (1948), On the Geology in the Vicinity of Kamitakara· uber die Corbiculiden Ostasiens. Venus, maru, Yoshiki-gun, Gifu Pref. (MS). Vol. 12, Sos. 1-2. KAl\IEI. T. (1952), The Stratigraphy of the Su:t.I'KI. K. (1919), Developements of the Palaeozoic Rocks of the Fukuji Distrit.:t, Fossil Non-Marine Molluscan Faunas in Southern Part of Hida Mountainland. Eastern Asia. fajJWI. four. Geol. Geogr .. four. Shinslm ["nit• .. Vol. 2. Vol. 21. Nos. 1-4. KOUAYASIII, T. (1939), On the Ryoseki YABE, H., NAGAO, T. and Srmuzt·. S. (1926). Fauna in the Inner Zone of Japan. (in Cretaceous Mollusca from the Sancln1 Japanese). four. Geol. Soc. Tokyo, Vol. Graben in the Kwanto ::O.Iountainland, 88. No. 45·1. Japan. Sci. Rep. 1'ohoku Imp. Uniz• .. Ser. 2. Vol. 9, No. 2. KOBA Y.\SIII. T. and Sl'Zl'KI, K. (1937). Non-Marine Shell of the Jurassic Tetori Y:\~1.-\GIWA, N. (1955), Cretaceous Mollusca Series in· Japan. ]ajxm. jour. Geol. Geogr .. from the Shima Peninsula. Japan. 1l1em. Vol. 14, Nos. 1-2. Osaka Univ., Liberal Arts and Educ., No. 3. Explanation of. Plate 17 , . AI! th~ illustr~ted . speci~ens are kept in the Institute of Geology, College of Arts and Sciences, Ch1ba Unt\·erstty, Chtba. (Lac: Tochio alternation of sandstone and shale in the Akai~v~ subgr~up. the upper division of the Tetori group, developed in Kamitakara-mura. Yosl11kt-gun, G1fu Prcf.) · Pofymesoda (Isodomella) kobayashii i\IAEDA, new species. Fig. 1. Left· valve, holotype. x 1. 0. Fig. 2. Umbonal view of holotype. xI. 0. Fig. 3. Right valve, paratype. x 1. 0. Fig. 4. Lateral view of the specimen shown in Fig. 3. x 1. 0. Fig. 5. Internal mould of left valve. paralype. xo. 9. Fig. 6. Character of lateral teeth of a paratype. x 1. 5. Fig. 7. Umbonal view of the specimen shown in Fig. 8. XL 0. Fig. 8. Left valve, paratype. xI. U. Fig. 9. Right valve, para type. x 1. 0. Fig. 10. Lateral view of tht~ specimen shown in Fig. 9. X 1. 0. Fig. 11. Left \'al ve, paratype. X I. 0. Polymesoda (Paracorbicula) sa11d111ensis (Y.\liE and N,\GAO) Fig. 12. Lateral view of the specimen shown in Fig. 13. x1.6. Fig. 13. Internal mould of left valve. x 2. 0. Fig. 14. Internal mould of right val\·e. x 1. 2. Fig. 15. Lateral view of the specimen shown in Fig. 14. xl. 2. Fig. 16. Character of sinus. x 1. ti. M AEDA : Polymesoda from the Tetori Group Plate 17 Trans. Proc. Palaeont. Soc. Japan, N. S., No. 36, pp. llil-167, pl. 18, ~ov. 30, 1959 :{72. ON SOME MARINE .:VIIOCENE 1VIOLLUSCA FROM 1IIE PREFECTURE, JAPAN* YOSHIO ARAKI Geology Department, Faculty of Liberal Arts, l\lie University .:::'.•ll1'it0ifiir!RJ:!:tWr~~U:jj)J~;::-? 1Y'L: ·-:GIM!ft0~f*il1f?11::"?t'"L 5 Wff sidered to represent undescribed forms Introduction and Acknowledgements will be treated in this article. All of the fossils are now preserved in During my geological studies in the the collection of the Geology Depart area surrounding Tsu City, Mie Pre ment, Faculty of Liberal Arts, .Mie fecture. J have been fortunate in obtain University. and those treated in the ing a large collection of fossil molluscs. present article are from the lsshi group, some foraminifers and others. Some whose stratigraphical sequence is shown molluscs among of them being con- in Table 1. Table 1. Stratigraphical sequence of the Isshi group developed in the area west of Tsu City, Mie Prefecture Formation names General lithological characteristics Alternation of sandstone and siltstone (more or less tuffaceous) Yakuoji 1 intercalating thin tuff in the upper part. alternation of sandstone and siltstone (more or less of flysch type) and 5-10 meters thick black siltstone in the 10\H'r part. Chaya Massi\·e sandstone intercalating siltstone layers, alternation of sandstone and siltstone ;,t places. Alternation of sandstone and tuffaceous siltstone intercalating tuff Kaisekizan in the upper part, dark muddy sandstone with sandy siltstone in the lower part. Arkoze sandstone intercalating thin conglomerate beds of gneiss Furutaikc and granite. Thin coal scam. Alternation of conglomerate and sandstone. cobble to boulder size Kongobo conglomerate of gneiss and granite in sandstone matrix . . . - .· .. unconformity and fault.------J're·Tcrtiary basement of gneiss and granite. ---- ·------ * Received Dec. 15, 1958; read 1 une 6, 1958. ll) 1 16~ Unfortunately there are no descriptive also occur in the present area. works on the fossil marine mollusca Here I wish to thank Professor Kotora from the lssh i group in l\Iie Prefecture I-lATA! of the Department of Geology. but K. TAKntoTo (1935) listed the mol Faculty of Education. Tohoku Univer luscan fossils from the group and ]. sity. for his kind advice concerning the YA:<.tAD.>. (1958) reported the molluscan present work. I also thank Professors fossi Is from the Kaisekizan formation Shoshiro IiANzAwA and Kiyoshi AsA:-.-o in the southern part of the same group. of the Institute of Geology and Paleon Therefore, although a full account of the tology. Tohoku University. for their fossil marine molluscs will be given at kindness during my research in that another opportunity. it is thought that Institute. the descriptions of some of the species considered to be new to science will Descriptions of the New Species faciliate the studies of other molluscan paleontologists in Japan and also serve Family Mytilidae to suggest the kind of fauna occurring from the :\liocene deposits in the area Genus A1usculus Roo1~c. 1798 west of Ise Bay, l'vlie Prefecture. Jl.fuscu!us hataii ARAKI, n. sp. The molluscan fauna from the Tvliocene Plate 18, Figure 1. series (!sshi group) developed in the area west of Tsu City comprise a typi· DesrriPfion :-Shell rather large. meas cal warm water assemblage, a charac· uring about 40 mm in length, 25 mm in tcristic feature of the early l\liocene height and about lll nun in depth of a marine fauna of Japan. This kind of right valve. Elongate·subquadrate in fauna is widespread. being known from outline. dorsal and ventral borders IIokkaid6 in the north. from where it nearly parallel with one another: an ranges southwards to the tip of the terior and posterior sides rounded. the main island of Japan. Everywhere anoterior more narrowly than the pos throughout this area, the early l\liocene terior. rather inflated with thin shell. molluscan fauna contains warm water obscurely provided with fine radial species. although it is evident that the threads or striae on posterior and an number of typically subtropical or terior sides of shell. the whole with warm temperate forms decrease with fine concentric growth lines. Beak the increase in latitude. and vice versa. swollen, inturnecl. directed forwards; The r.liocene series as represented in obscure but wide depressed area extend the present area is thought to include ing from behind beak to middle to only the early ?vliocene in a two-fold posterior part of ventral margin. division of the series. It may be cor Remarks:-This new species resembles related with deposits in other areas Musculus laevigatus (GI~AY) ligured by containing such molluscs as Glycymeri> T. HAHE (1955, pl. 4. figs. 12, 13) from cisslmensis :\lAI..:IYA~L-\, Gl. idensis 1\,,:-;:xo. Hokkaido. but can be distinguished Lima yagenensis On;KA, Periploma yolw the ref rom by the more prominent beak, yamai lVIAK IYA~IA, ]oanisiella meisensis less flaring posterior side of the shell, 1\1AKIL\:<.IA, Dosiuia chikuz.enensis N.>.c.Ao. more equally parallel dorsal and ventral Soletelliua minomzsis YoKoY.HIA. Turritel margins. and by the less distinct radial la s-IJataii Nn~It'HA. besides others, which striae. 372. l\1arine Miocene l\1ollusca from Mie Prefecture 16:3 Locality and Keological formation: and P. o/o/z.imeae HAI3E (IlAnE, 1952), and Roadside cliff at about 300 meters was found to differ from each of the northwest of Onohira, Gein6-ch6. Age mentioned ones by the size of the shell. gun. I'vlie Prefecture. Kaisekizan for outline. angularity of the anterior half mation, Miocene. of the shell. and by the growth lines Depository :-Geology Department, l\lie being periodically undulating and hav University. ing obscure interstitial ones. Besides the holotype specimen there are several paratypes. but the majority Family Periplomatidae are more or less fractured or deformed. but still retain the specific characters Genus Pe1·ip/oma ScHt':.I,\CIIER, 1817 above described. Locality and geological formatimz : Perip/oma mitsuganoense Tsuzumi Pass. Mitsugano, 1-:!akusan-cho. ARAI rounded, sharply descending into narrow 50.5 mm, length about 53.5 mm, depth of v-shaped interspaces, crossed with con a right valve about 15 mm. centric growth lines: eroded shell sur Remarks:-This new species resembles face with radial ribs as squarely round Cyclina (Cycli11orbis) lrmulata MAEIYAMA ed elevations about equal to or a little (1926, pl. 13. fig. 1) from the i\liocene of narrower than their fiat-bottomed inter North Korea, but may be distinguished spaces. Hinge-teeth and other internal therefrom by the more expanded an features inaccessible. terior side. weaker concentric sculpture, Remarks:-This new species is easily more arched antero-dorsal border and distinguished from Venericardia sioga less straight posterior border. Cyclina mensis Nm.lt:IL\ (1935. pl. 17, figs. 8-11), japonica KA:o-.rADA (1952, pl. 15, figs. la a Miocene species originally described b, 2, 4) from the ivliocene of Gifu Pre from Siogama City, Miyagi Prefecture. fecture, differs from the present one by by the shape of the shell which is more the shape of the shell. trigonal: the number and type of radial The specific name is gi\·en in honor of ribs in the two species are about the Mr. Yasuhiko KM.rADA of the Nagasaki same, but the size and shape of the University, who had particular interest shell are quite different. in the species of the genus Cyclina. Locality and geological formation: Lorality and geological formation: Road cutting on road leading from Small cliff at the paddy-field situated Funayama to Kozahara. l\lisato-mura, at about 200 meters northwest of Bessho, Age-gun, \lie Prefecture. Kaisckizan Misato-mura. Age-gun, l\Iie Prefecture. formation. Miocene. Furutaike sandstone. Miocene. I >eposit01y: --Geo I ogy Department. l\1 ie Depository :-Geology Department. Mie University. University. Family Veneridae Family Dentaliidae Genus Cyclina DEsHAYEs, 1849 Genus Dentalium Lrl'\Kt~, 1758 Cyclina kmnadae ARAJ,J, n. sp. Dentaliwn misatoeusis ARAKI, n. sp. Plate 18, Figures 4a, -lb. Plate 18, Figures 5a, 5b. Description :-Shell large in size, a little longer than high, subcircular. Description :-Shell generally large, Antero-dorsal border broadly expanded. measuring more than 75 mm in length the riostero-dorsal roundly sloping into and exceeding 9 mm i:1 diameter, test posterior side which is well rounded. heavy. Shell nearly straight, only Anterior side rounded, well expanded. slightly curved, gently tapering. Aper Ventral margin rather sharply rounded tural and apical extremities broken. with fine crenulat'ions on its inner Smooth throughout. only with \\·eak border. Shell rather thin, provided with concentric growth rings. Shell of under fine concentric growth lines and periodic surface with undulating rings. coarse ones. Beak small, pointed, in Remarks:-This species more or less curved, directed anteriorly. Sinus and resembles Dentalium- 1ceinkauffi Dv-.KER muscular impressions obscured. Height figured by HrRASE (1932, pl. 3, fig.), a 372. Marine ivfiocene Mollusca from Mie Prefecture 165 common Recent shell of japan and also Remarks :-Unfortunately the features occurring as fossil from the Pliocene to of the aperture remain unknown owing younger deposits of Japan. However, to the covering of the matrix and also in Du;-.;KJm's species there are longitudi the youngest whorls could not be ex nal striae at the apical part, whereas tracted from the matrix.. they are not developed in the present Locality and geological formation:- new species, and the shell of the pre Small cliff near the temple of Yanagi sent specimens is thicher. dani, Misato-mura, Age-gun. Ivlie Pre This is a common species in the pre fecture (Holotype). Kaisekizan forma sent area where it occurs in association tion. 200 meters north of Kubo on road with many other molluscs of the genera leading from Kubo to Shibukuro in the Venericardia, Turritella. Euspira and western part of Tsu City. Mie Prefec encrusting calcareous algae. ture. Yaku6ji formation. Both Miocene. Locality and geological formation: Depository :-Geology Department. I\lie Road cutting on road leading from T..;niversity. Funayama to K6zahara. Funayama, l\li sato-mura, Age-gun. lVIie Prefecture (Holotype). Roadside cliff at the Family Neptuneidae western side of Nakamura. Hisai-cho, lsshi-gun, Mie Prefecture. Both oi the Genus Ancistrolepis DALL, 1894 Kaisekizan formation. .iVIiocene. Ancistrolepis trodioideus miensis Depository :-Geology Department, l\Iie University. ARAKI, n. subsp. Plate 18, Figures 7a, 7b, 8. Family Volutidae Description:-This new subspecies re sembles Ancistrolepis troclzoideus DALL Genus Fulgoraria Scnn.tAcHER, 1817 (1921, pl. 9, fig. 5: SuzuKI, 1935) in general shape of the shell and in the Fulgoraria hirasei yanagidrmieusis possession of spiral cords which are ARAKI, n. subsp. much narrower than their interspaces Plate 18. Figure 6. and which often contain one or two intercalary threads. However. the pre Description:-The present subspecies sent one differs from DALL's species in resembles Fu!goraria hirasei SowERRY having eight spiral cords on the body figured by Sl'.tiTH (1942. pl. 10. fig. 78) whorl. three in the adult on the penulti in general features, but can be dis mate and in young specimens only two tinguished therefrom by the narrower on the penultimate and one on the shell, more twisted canal, more narrowly second whorls. The whorls are less spaced longitudinal ridges which extend shouldered. more rounded. and the spiral nearly over the body whorl as mere cords rarely accompany with intercalary striations, and by the concentric striae threads. Height 40 and 22mm. maximum being apparently stronger. The curva diameters of body whorl 26 and 16 mm tuni of the shoulder is more expanded. respectively for two specimens (Cotype). Height about 71 mm, maximum diame Remarks :-Neptunea onmrai OTUK A ter of body whorl about 18 mm. (1940, pl. 11, figs. 5, 6) from the Miocene 16(1 Yoshio AR.tKI deposits in Teshio Province. IIokkaido. more or less resembles the present sub· Literature Cited species, but can be distinguished from it by the narrower and higher shell. DAJ.L. \V. H. (1921). Summary of the Marine Shellbearing Mollusks of the Northwest less recurved canal, and by the number Coast of America from San Diego, Cali· and strength of both spiral cords and fornia, to the Polar Sea. mostly Con· intercalary threads. tained in the Collection of the United Locality and geological formation:- States ::\ational Museum, with Illustra· 200 meters north of Kubo on road lead tions of Hitherto Unfigured Species. ing from Kubo to Shibukuro in the Bull. U.S. Nat. Mus., 110. 112, 217pp .. 22 western part ,of Tsu City. Mie Prefec· pls. ture. Yaku6ji formation. Cliff of the IIABE. T. (1952), Genera of Japanese Shells. southern slope of Kaisekizan. Sakakihara, Pelecypoda, no. 3, pp. 186-278 (refer to Hisai-cho, Isshi-gun, Mie Prefecture. pp. 264-265, text-tigs. 700, 701) Kaisekizan formation. Both Miocene. (1955), Fauna of Akkeshi Bay. XXI. Pelecypoda and Scaphopoda. Pub/. Deposi!Oty :-Geology Department. lVIie Akkeshi Mar. Bioi. Stat .. 110. 4, pp. 1-31, University. 7 pls. HATAI. K. and S. NrSIYA~I:\. (1949), New Tertiary l\Iollusca from Japan. ]our. Explanation of Plate 18 (All figures in natural size) Fig. 1. 1lfusculus hataii ARAKI. n. sp. Holotype. Loc.: Roadside cliff at about 300 meters northwest of Onohi ra, Gein6-ch6, Age-gun. Mie Prefecture. Kaisekizan formation. Figs. 2a, 2b. Periploma mitsuganoense ARAKI, n. sp. Ilolotype. Loc.: Tsuzumi Pass. Mitsugano. Hakusan·cho, Isshi-gun, l'..Iic Prefecture. Kaisekizan formation. 2a. view of the right valve. 2b. view from the dorsal border. Fig. 3. Veuericardia fmwyamcnsis ARAEI. n. sp. I-Iolotype. View of the right valve. Loc.: Road cutting on road leading from Funayama to Kozahara. Misato-mura, Age-gun. Mie Prefecture. Kaisekizan formation. Figs. 4a, 4b. Cyclina kamadae ARAKI, n. sp. Holotype. 4a, view of right valve. 4b. view of the same from the beak. Loc.: Small cliff at the paddy-field situated at about 200 meters northwest of Bessho, Misato-mura. Age-gun. Mie Prefecture. Furutaike sandstone. Figs. 5a. 5b. Denta!ium misatoensis ARAKI, n. sp. Holotypc. 5a, lateral view. 5b. cross sec tion of the aperture. Loc.: Road cutting on road leading from Funayama to Koza· hara, ?v1isato-mura. Age-gun, Mie Prefecture. Kaisekizan formation. Fig. 6. Fulgoraria hirasci yanagidanien,,is ARAKI. n. subsp. Holotype. Although the apical part is not fully exposed, the characters are of subspecific value. Loc.: Small cliff ncar the temple of Yanagidani, Misato-mura, Age-gun, Mie Prefecture. Kaisekizan formation. Figs. 7a, 7b. 8. Ancistrolepis trochoideus mieusis i\RAKI. n. subsp. Cotype. 7a. back view of 7b, which is the front view. 8. fractured specimen showing the features of the younger whorls. Loc.: Cliff of the southern slope of Kaisekizan, Sakakihara, Hisai· cho, lsshi·gun, lVlie Prefecture. Kaisekizan formation. ARAru: Miocene Mollusca from Mie Plate 18 8 2a 7a 2b 4b 5b lCuMA «Ar Photo, 372. Marine Miocene lV!oltusca fronz Mie Prefecture 161 Pat.. rot. 23, no. 1, pp. 87-94. 2 pis. On:K,\. Y. (1940). Miocene Mollusca from HIR:\SE, S. (1931). Scaphopod Mollusks Te::;io Province. Hokkaido. Japan. ]our. found in Japan. ]our. Conch., vol. 19, no. Geol. Geog1· .. ml. 17, nos. 1-2, pp. 91-99. 5. pp. 132-141. 17 figs., 1 pl. 1 pl. KA~L·\DA, Y. (1952). On Some Species of S~liTil. M. (194:!). A Review of the Volutidae. Cyclina from Japan and Korea. Trans. Beai-Maltbie Shell },Jus. Pub!.. 70 pp., .26 Proc. Palaeont. Soc. japan. N. S., 110. 6, pp. pis. 167-173. 1 pl. Suzt:Kl, K. (1935). On the Fossil .4llcistrole· Kt;RoD .. \. T. and M. HoRIKOSlll. (1952), On pis trochoideus (0.\LL) from the Pliocene Two ;..[ew Species, Perip/oma Ol'a/a and Formations of Boso Peninsula. ] apw1. 0_1}'adesma nakamigawai (Periplomatinae). four. Malac., vol. 5, no. 4, pp. 187-194, 9 figs. japan. jour. Malac., z·ol. 17, no. 1, pp. Hi- TAKllllOTo. K. (1935). On the Cenozoic Sys 22, 3 figs. tem in the Environs of Isshi-gun. Mie MAEIYA~tA.]. (1926). Tertiary Fossils from Prefecture. Chikyu, vol. 23. no. 5, pp. North Kankyo-do. Korea. Mem. Colt. Sci .. 326-338. 1 map. Kyoto Imp. Unit• .. Ser. B. 1·o/. 2. 110. 3, art. Y,\~IADA, J. (1958), On the Geology of the 8, pp. 143-160. 2 pls. Tertiary Formation in the Drainage of --- (1943). The Asagaian Mollu::;ca of the Kumozu River. with Reference the Yotukura and Matchgar. 1\Jem. Colt. Isshi Group. fub. Pub!. Commen. Prof. Sci .. 1\yoto Imp. Unil• .. Ser. JJ, l!O/. 10, ll. Fujimoto's Sixtieth Birthday. pp. 277- no. 2. art. 6, pp. 121-167. 5 pis. 281, 1 map. 3 figs. r\n~IL'RA. S. (1935). Miocene Mollusca from YoKoYA\1:\, M. (1924). Molluscan Remains Siogama. Northeast Honsyu, Japan. Saito from the Lowest Part of the Joban Coal· Ho-on Kai l11us .. Res. Bull.. no. 6, pp. 193- Field. ]our. Coil. Sci .. Imp. Uni1:. Tokyo. 234. 2 pis. ml. -15. art. 3, pp. 1-22. 5 pis. Trans. Proc. Palacont. Soc. Japan. N. S., No. 36, pp. 168-180, pl. 19, Nov. 30, 1959 :37:3. TAXODONTA AND ISODONTA FROM THE JURASSIC SOJ\IA GROUP IN NORTH JAPAN* 1\IINORU TAMURA Faculty of Education, Kumamoto University ·~AMffi~w~-~~5~®D8=tt~reE: m~~~5~MW8=ttRreEw~t.M miWJf!!lHf1<:A.;!1.fdl.o!f10l1VJa,~,J'ilJFI30~1~0 Taxodonta (6 :j)H. 3 t 2 ~f!!D &0: lsodonta (15 flli, 3 t> 3 ~ft]) "i>~~i\l~Jt~o L.;!'\.i;.0::".[:l{J!l.1tt:i1iimtii!!£JII:ttl!15&0:1tHi 0~;;-fi:jlf;ji[(O)~m*fei!fi0 t 0 c fttif!:1 VC:b I). L. ;f1, t? 3 :lti!~O)!IiJJf~ilf0ti!ilif:l:~~VCP ;J., X ':!til§ «X &0: t:" 7 '1' • .:c. =r ;;t t:'-1' I.K CD l:$ ~ .::L 5 * 'b·; i!fi -9.;:, Ctenostreon probo- scideum (J. So\Y.) 'b;i!fiU:Ii' 7.>, lfl ff ~ It has long been known that the termination. 1\IL\SATANI suggests Batho Koike limestone in Soma district. f'uku nian or Callovian, Oxfordian or Kim shima Prefecture (Province of Iwaki) is meridgian and Portlandian respectively a member of the Jurassic Torinosu for the Awazu, Nakanosawa and Koya limestone widely distributed along the mada formations. Subsequently KnicRA Pacific side of Japan. It was referred (1954) studied the sedimentary rocks of to Kimmeridgian by KoB.\YASIII (1935) the Nakanosawa formation with the by AulacosPfzinctoides aff. steigeri. Ac result it was found that the Koike cording to MAsATA;-o;I (1950) the Soma limestone is not a single bed but an Jurassic \~vhich forms an anticlinolium aggregate of limestone lenses with marly consists of the following formations in and sandy intercalations. descending order: Because the group contains several Koyamada formation fossil beds and its structure is relative --- conformity ly simple, it bears special importance Tomi:r.awa formation for the Upper Jurassic stratigraphy in --- conformity 1he Pacific side of Japan. Under the .:-;akanosawa formation guidance of Prof. T. KoBAYASHI, the --- conformity writer has studied the group and dis Tochikubo formation covered 10 zones of Trigoniae (Fig. 2). --- fault (probably unconformity) as already described by T. Ko!L\YASIII Sugaya formation and the writer (1956, 1957). Judging --- disconformity Awazu formation from the Trigoniae. the Soma Jurassic --- unconformity can be divided into two major parts. llayama formation namely, the upper or the Koyamada Giving fossil lists by provisional de- Nakanosawa formations and the lower or Sugaya-Awazu formations. In the * R"ceived Jan. 17, 1959: read Ft.:b 14, upper, 111yop/wrella. especially Haidaia, 1959. is the leading members. Haidaia. in 168 373. Taxodonta and 1sodonta jrom tlze Jurassic Soma Group 16!1 particular, is restricted to this part The present study is dealt \vith the and its equivalents in West Japan. On pelecypods from the Nakanosawa and the other hand, the lower Trigonian Koyamada formations. assemblage characterized by Scap/w Beside the Trigoniae Neoburmesia iwa lrigonia. Latilrigonia and lbotrigonia is kieusis was described by YABE and SATO similar to the Aratozaki assemblage and (1942) and SomaPecten kamimanensis and the lower Tetori assemblage. l\7ipponi AequiPeclen ogmcensis by Kr~tt:RA (1951 ). lrigonia sagau:ai, however, occurs from Here the Taxodonta and Isodonta are the lower as well as the upper part. described. The stratigraphic notes. fos· Its occurrence is also reported from the sil zones and localities are summarized Torinosu and Tetori groups. ?\o pele and shown in figures 1-4 and table 1. cypod species is common between the The fossils. here used. were collected Sugaya and Nakanosawa formations, al by iVIAsATAKI, KIMURA and others in though there are some co-existent genera. cluding the writer and stored in the Geological Institute. University of Tokyo. The writer wishes to express his cordial thanks to Prof. T. Kos.>. YAsur of the University of Tokyo for constant guid ance, supervision of the manuscript and permission for describing the fossils in his institute. Thanks are also due to Assist. Prof. T. Kr!\tuRA. ~Iessrs I. HA YA ~~~ and A. ToKtJYA:-.rA of the same university for their assistances. Family Parallelodontidae Genus Paralldodon MEEK and \VORTIIE:'\, 1866 Parallelodou Jwikensis TAMCRA, new species Plate HI, Figures 9-11. Description :-Shell small, moderately inflated. much inequilateral. elongate Fig. 1. Fossil localities of Koyamada and Nakanosawa formations. and rectangular in outline, about twice as long as high; umbo slightly incurved. H: Hayama Y: Yamashita at about 1/3 from anterior end; dorsal J: Jisahara Jlf: Minamisawa margin subparallel to ventral: umbonal K: Kurumagawa .Ua: l\Iano riYer furrow shallow but causing a sinuation Ki: Koike N: Nakanosawa Ky: Koyamada Ta: Tatenosawa on ventral margin: umbonal carina dis M: Minahara U: Umasawa tinct; post-carina! area strongly depres 0: Oyama Y: Yasukirasawa sed; radial ribs numerous, fine but T: Tomizawa 1-16: sec Table 1. strengthened on lateral sides, especially To: Tochikubo so about post carinal 8. 110 Mi1wru, TAMURA u 10 t 8 Tc 7 :(-~;~_':·(.',}\\·? r r•, !': • • ·.' : ·.: • .' ',•:_ Ko q p m 9 '"· .. ·...... I Fig. 2. Pelecypod's Fig. 3. Nakanosawa Fig. 4. Koyamada fossil zones in Soma ] u formation at Nakano formation at Umasawa rassic group ( x 1/1250) sawa (XI/125) (X I/125) Aw: Awazu formation c: platy ss Ha: Hayama formation d. c. g, h: coarse quartzose ss Ko: Koyamada formation f : calcareous ss Na: l\:akanosawa formation i : calcareous Is bearing ss Su: Sugaya formation j: Koike Is, bearing sandy & marly part Tc: Tochikubo formation k. m. p, r, t : black sh partly sandy sh Tm: Tomizawa formation I. o: coarse ss 1-10: Trigonian zones q. s. u: black sh. partly sandy ss and rich a: coarse ss in onion structure b: Lima rich ss 37 3. Taxodonta and Isodonta from the jurassic Soma Group 171 Table 1. Fossil locality and its horizon No. of Fossil I No. of Trigonian locality in zones in Fig,. 3 Fossil locality Fig. 1 1 6 )\akanosawa, Tomizawa, Soma city 2 5 II 3 7 Minamisawa, Tomi.zawa. Soma city ·I 7 5 5 & 6 II 6 8 North yalley of Ilayama, Kamimano·villagc, Soma co. 7 7 East of Minahara, Kamimano·village. Soma co. 8 5 West of Yamashita (Yasukurasawa), Kamimano·village. 9 10 South of Yamashita, Karnimano·village. 10 10 ' V{est of Kurumagawa, Karnimano·village. 11 10 Umasawa, Koyamada. Kamimano·village. 12 9 /1 13 8 Koike, Kamimano·\'illage. 14 8 15 7 & 8 Tatenosawa. Koike, Kamimano·village. 16 6 II Table 2. Fossil spedes and its range chart Fossil Zone Fossil species 5 6 7 8 9 10 Para/lelodon lwikensis T:\:-tt:RA. n. sp. X X Parattelodon aff. injlatus TA:-tLRA X Grammatodon takiensis Kl~lt:!L\ X X X X X Grammatodmz (bulogrammatodon) densistriatus T.\:\JURA. n. sp. ' X Catella (Torinosucatella) kobayashii TA:>.JlJRA X X Nuculana (Dacryomya) stenodoliclzos K; :-.n R A X Chlamys camptonecloides T ..nJt'R.\, tl. sp. X X Clzlamys sp. X Chlamys (Radulopecten) ogmcensis (Kt ~~ t K ..-.) X X X Camptonet:les sp. X "Aequipectelt'' zmlgaris Kl:>.ll'RA X "A.equipec!etz" kotsubu Kl:O.ICR A X Eopecten pzmctus (KI~HJR,\) X X 1;1tlo/ium yatsujie1zse Kt:R:\TA and K1~JLRA X Entolimn llimurai TA~IURA X Somapecten kamimanensis Kl:O.IUR.'\ X X Lima (Ctenoides) tosana Kt:>.JL'RA X Lima (P/agiostoma) enorn:icosla TA:>.JUL\. n. sp. X Lima (Plagiostoma) sp. X Ctenoslreon proboscideum (]. SowERBY) X P!icalula dichotomocosla T,\\ll'!{:\, n. sp. X ------..... ) 1 I~ Minoru TAM UR.l 1lleasurements :- L H llolotype (left valve: MM3193) 21 mm 10 111111 Paratype (left valve: MM3195) 20 10 Obserl'alion :-Two left valves and an numerous radial ribs and concentric incomplete right valve at hand are growth-lines; hinge of Paralle/odon type. black. probably stained by carbonaceous Observation:-This description is found matter which is rich in the Koike lime ed on a incomplete internal mould and stone. The furrow on surface is shallow its external one. Its large and inflated but distinct in the paratype specimen form agrees probably P. injlatus from (l\IM3195). The elongate shape and fairly the Jurassic SaKamoto formation. though coarse ribs on the depressed post-carina! the furrow on surface is invisible in part are the characteristic of the species. the Sakamoto form. The surface orna It is a non-alate Parallelodon. ments consist of numerous radial ribs Comparison:-This can b!! easily dis in addition to a secondary rib in each tinguished from P. injlatus TA.\WRA interspace and many concentric lines. It (1959) in its small size. anterior umbo looks like a net-work. and elongate outline. P. nimnolzame11sis Occurrenre :-9th zone at l.oc. 1~. H."-'"''""' (1958) from the Liassic Nirano hama format ion is quite different from it in the post-carina! ornaments. Area Family Cucullaeidae quadrisu/mla Sow. (LoRtoL et PELLET: 1875) from the Sequanian of Mont des Genus Grammalodou MEEK Boulogne-sur-Mer is somewhat allied to and HAYDEN, 1.860 it. but the post-carina! ribs are only 4. Grammatodon takiensis K r M nr~A Para!lelodon fw_vserlingii (d 'OruliG:-~Y) from the Oxfordian of Cambridgeshire (AR- Plate 19. Figures 4· 6. 1\ELL; 19~9) resembles it but the post carina! ribs are not so coarse. 1956. Grammatodon takiensis, Kt~IL:R.\, p. 85, Occurrence :-7th zone at Locs. 13, 15 pl. 1. fig. 6. and 8th zone at Loc. 14. 1959. Grammatodo11 takie11sis, TA:O.!VR:\, p. 54, pl. 6. figs. 1, 2. Parallelodou aff. infiatus TAMVRA This species is variable in outline and ornaments but generally small. Radial Plate 19, Figures 12-15. ornaments are feeble or obsolete in the middle part. Anterior radial ribs are aff. 1959. Parallelodon injlatus, TAJ\!l7RA, p. 53. pl. 6, figs 9, 10. usually about 13 but posterior ones vary in number. In some, 3-4 secondary ribs Description :-Shell medium to large, are inserted but in others primary and innated. elongated and somewhat oblong secondary ribs are indistinguishable. in outline; umbo incurved, improminent: Occurrence :-5th zone at Locs. 7, 8: umbonal furrow shallow; ventral margin 7th zone at Locs. 13, 15; 8th zone at sinuate at the end of the furrow; umbo Loc. 14; 9th and lOth zones at Locs. 9, nal angulation carina-like; surface with 10, 11, 12. 373. Taxodorzta and Isodont a from the jurassic Soma Group 17:1 ate at about anterior 1/3 of hinge; Subgenus Jndogrammatodon Cox, 1937 hinge-line nearly straight: posterior margin obliquely extended back: anterior Gmmmatodon (Jndogrammatodon) inseparable from rounded ventral drmsislriatus T,nlul~''• new species margin; umbonal carina blunt: left Plate 19, Figures 4-6. valve ornamented by numerous radial ribs and several concentric growth Description :-Shell small for subgenus, lines; radials coarser in anterior side moderately convex. equivalve. inequi and fine in postcarinal part: hinge of lateral. elongate and trapeziform in Grammatodon-type. i.e. 3 elongate teeth outline; unibo · not strongly inflated. parallel to hinge margin in posterior prosogyrate, slightly incurved and situ· part of right valve and 2 in left. J1!easuremenls :- L H HiL ·---~--- Right vail'e (MM3201) 29mm 18mm 0.62 Left (l\IM3202) 23 14 0. 61 Right (MM3203) 22 13 0. 59 Left (MM3203) 21 11 0.52 Left (l\IM320-1) 23 13 0 57 Observation :-Several specimens show G. takiensis is no more than 18 mm in ing external at hand are all moulds of length but all of dens,istriatus in hand left valves. The difference on surface exceed 20 mm in length. ornaments between both valves is Occurrence :-5th zone at Loc. 8. unknown. but its distinct radial ribs. not inflated umbo, elongated and oblique Genus Catella H£'ALEY, 1908 ly extended form are the characteristics of Indogmmmatodon. The radial ribs in Subgenus Torinosucatella T_,_MI:RA, 1959 the left valve are unusually fine and Catelfa (Torinosucatelfa) numerous for Judogrammatodon. Several concentric striae cross the radial ribs and kobayashii TA~IURA look net-like in posterior. Plate 19, Figures ;-, 8. Comparison:-This resembles Gramma todon (lndogrmimzatodon) virgatus (J. de 1959. Catella (Torinosucatella) kobayashii, TA C. SowErHJY) (Cox, 1937) in general shape l\IUIL-\, p. 55, pl. 6, figs. 11-16. but radial ribs are much finer. Gram The external constriction of surface matodon takiensis Kr~tURA from the same in the Soma form is weaker than in the district is very similar to this at a sight. Sakamoto form. The inflation near umbo The more anterior and non-inflated umbo. is sometimes (MM 3206) prominent. obliquely dilated shape and more dis Ocwrrence :-7th zone at Locs. 13, 1~ ; tinct radial ribs on the middle part 8th zone at Loc. 14. easily distinguish this from G. takiensis. The middle radial ribs are generally Family Nuculanidae invisible or very- feeble in G. takie11sis, if· observed. The greatest specimen of Genus Nuwlana L1xK, 1807 174 Mhwru ·T.tBIUR.l ------Subgenus Dac1yomya AGASSIZ, 1840 iUeasU1"C111C1liS :- L H ·Nuculana (Dacryomya) Left valve (MM3209) 18mm 24mm stenodolicltos KI:-n;RA Left (MM3210) 7 9 Right (MM3211) 7 9 Plate 19, Figure 40. Right (MM3212) 8 10 ---- 1956. Nuculana (Dacryomya) s/eJwdolichos, KI MURA. p. 83, pl. 1, Jig. 1. Observation and Comparison :-The right 19S9. _Nuculana (Dacryomya) stenodolichos, T A· and left valves differ in shell convexity r-ic RA, p. 57. pl. 6. figs. 17-19. and surface ornaments.. The writer erected this species chiefly l~ased on its Occurrence:- One poorly preserved Camptouectes-like ornaments. As the internal mould of a right valve from radial ribs which are stronger than the the 8th zone at Loc. 14. concentric ones- in both valves, become slightly scaly and run straight, it is Family Pectinidac sure that this can be involved i'n Clzla mys. Pecten sp. (DEciJASEAL:x, 1936) from Genus Ch!amys BoLtE:--; MS, the Oxfordian of Paris Basin is some Rooi:-:c, 1798 what similar to this species but the concentric ribs are feeble and radials· Chlamys campto11ectaic/es more scaly than 01. camptonectoides. . - T!H.wRl,:~ ne\\: species Occurrence :-7th zone· at Loc. 15 and 8th zone at Loc. 14. _ ~!are 19, Figures 16,- 17. Descriptioll :-Shell small to medium Cltlamys sp. in size~ iriec}uivalve, nearly equilateral Plate 19. Figures 30, 31. e~slustx~ q.f:_q_urj"Cies, etongate orbicular and much higher than long. Right Shell medium to large for genus, valve dep1'ess~l-:-hinge-tl1a·,:gin straight; inequilateral, nearly as high as long, anterior auricle. a.Utrlelanter than pos somewhat· quadrate in outline. Right terior; both~ extremiti~s of auricles valve highly infl~ted, inequilater~l and acute-angled ; · byssid· sinus' below anteri extending antero-ventrally: umbo at or -aur-icle deep;-- anterior- and. posterior abqut 1/4 from poste~ior ·end; hinge dorsai margins nearly: straight.: apical line· ~traight; anterior auricle twice or angl!! abo_ut 7W:; :ventral ,margin semi more qS long as posterior, byssal sinus cir~ul"ar; SUl:face COVered by -numerous . beiow a;1terior auricle deep; dorsal (80 or more) radial ribs and- fairly dis margins nearly straight and apical tinct ·concentric ribs; radials slightly a;,gJe ·'go' or less; ventral margin round scaly; secondary riblets sometimes in ed; surface with 30 or more r~dial rib<: .. serted. Left valve moderately convex; T~v~. internai mo~lds of right valve concentric lines of grtnvth not so strong at hand lack ventral parts. The: inflat- _ and regular as in right valve; radial ed right valve and the l~rge anterior ribs stronger and coarser and more wing -are ~\YO ~char:acteristics_. The de- regularly inserted by secondary riblets tails of the ornaments are, -how~ver, un than in right valve. preserved. This form, however, differs 373. Taxodonta and Isodonta from the Jurassic Soma Group i 7'5 distinctly from Jurassic Clzlamys ever equal ears and shell form, this is very described from .Japan in its large and similar to Entolium japonicum from the inflated form. Upperjurassic of Sakawa basin (KIMURA, Occurrence :-5th zone at Loc. 5. 1951) has no radial ornaments but one oi Knil:R.'\s specinuen {l\1M7103) resem bles this in form. C. sp. aff. brozmi Cox Subgenus Radtt!opecten Rou.IER. 1911 from the Sakamoto formation (T_.AMURA, Chlamys (Radu!opecteiz) 1959) is easily distinguished from it in oga~censis (Kir-.tt:RA) the small anterior ear. Occurrence :-5th zone at Loc. 7. Plate 19. Figures 23-26. 1951. Acquipecten o.r;awensis, KI:I.ICRA. p. 343, Genus .4.equipecten FiscHEl~, 1887 pl. 1. fig. i. 1959. Ch/amys (Radu/opecten) ogazcensis. T \· .. A.equipecten" lwtsubu (KI~ll·I~A) ;>.It RA. p. 58. pi: 6, fig. 3i. 1951. Neithea kotsubu, KI~IIJRA. p. 3-13, pl. 1, Pectinids arc poor in the Soma Ju figs. 8. 9. rassic in number of both species and 1959. "Aequipecten" kotsulm. T,\\ll'll.\, p. indi\riduals. But this species is more 58. pl. 6, figs. 33. 34. common ·here than in the Sakamoto Occurrence :-One internal mould of a formation, and probably attains 30 mm right valve from 5th zone at Luc. 2. in' height. · 'Fii1c growth-lines are dis tinct and the test is thin· in the Soma form. .. Aequipecten .. vulgaris K1 :v1n~A · Occurrente :-5th zone at Lacs. 2, 7. 8; Plate 19. Figure 22. o6th zone at Luc. :i; 8th zone at Loc. H. 1951. .-kquipe,;tett I'll/garis, KI~Ili!~A. p. 3'12, pl. 1, figs.: 5, 6. Genus Camptonecles l\1EEK, 186-1 1959. ".4equipecten" l'ulgaris, T.~\li'IIA, p. CamjJ/onectes sp. 58. pl. 6. figs. 40, 41. · Plate 19, Figure 28. Occurrence :-5th zorie at Locs. 2: 7. Shell medium :c~s in-m long). fairly Genus EojJecteu Dot.:YILL~ •. 1897 -convex. :e~uilatera1 · exClusive of ears, -orbicular and higher ·than:lorig :- hinge Eopecte11 pzi.nctus (Ki:-.~t'RA) IiJatg(n' stniighc anterior. ear· twice· or: more as long as· the· posterior;· dorsal P.late 19. Figures IS-21. ma-rgins. straight -and disposed· subrect 1951. r."'pectell Puncta. KI\Il'IIA, p. 3-18. pl. 1, angul~rfy.:. vent~ diagonally elongated: hinge margin Eutolium yatsujiense KL'RATA straight: anterior auricle not clearly and KrMur~A demarcated from shell body. no less than twice the depressed posterior one: sinus Plate 19, Figure 41. below anterior auricle shallow; furrow 1951. Entolium yatsujiense, 1\I;\I!iRA, p. 346, between shell body and posterior ear pl. 1. figs. 18a, b. distinct. narrow: apical angle about goo 1959. E11tolium yatsujiense, T A :I. II.' RA. p. 60. pl. or less: ventral margin nearly rounded 6. fi¥. 30. but angulated by radial ribs: these ribs crest-like on top about 9 and ridge-like Occurrence:- Restricted in 6th zone at in shell body and 1! or so on anterior Locs. 5. 16. auricle; a secondary rib inserted in each pair: tertiary radials fine: several con Entolium kimurai TA!\WRA centric wrinkles distinct near umbo. Plate 19, Figure 27. l!i59. Entolium kimurai, TA~I!:RA. p. 60. pl. llfeasurements :- L H 6, tigs. 23-29. Left valve (Ml\13220) 12mm 13mm Two kinds are distinguished in this Left (MI\13221) 20 19 species from the Sakamoto formation. Soma specimens belong to the form Obserllatiou and Comparison :-A frag-, whose apical angle is 100o or more and mcntary right valve is allied to l•.:opecten the height is nearly equal to t~1e length. PuncfiiS',Kr~wRA)from thcTorinosu group It is smaller than the Sakamoto form of Sakawa. Several left valves allied to on an average. Eopecten in its peculiar ornaments occur Ocwrrence :-Restricted to the sandy together with the fragments of Eopecten shale (lOth zone) of Koyamada formation Pmzctus. Eopecten sp. from the Sakamoto at Umazawa (Lac. 11) and Lacs. 9. 10. formation (TAl\HJRA, 1959) differs from this species in surface ornaments which Genus SomaPecten Kr:-.tl'RA. 1951 are seen on an internal mould of a leit valve. They are approximate to those Somapecten kamimmzeusis Kr!I·IL'RA of the right valve of Eopecten pundus in Plate 19, Figure 29. form and size. From these facts these specimens are considered probably the 1951. Somapeclen kamimammsis, KrML'RA, p. left valves of Pzmctus. Eopecteu aubryi 347. pl. 1, figs. 19, 20. (Dou\'rLLE) from the jurassic of Cutch 1959. Somapecletz kamimane11sis, TA~Il'RA, p. is close to it in ornaments. But the 62, pl. 6, figs. 50-55. primary radial ribs are 12 and concentric Two kinds of shell outline are recog wrinkles indistinct in E. azibryi. nized it} this species, namely, a quite Occurrence :-5th zone at Lac. 2: 7th orbicular form and a tall ovate form. zone at Lac. 15. I The latter occurs at Sakamoto,. Yatsuji and Kurisaka and the other at Sakamo'to Family Amusiidae and Soma. Sakamoto specimens are mostly high. These two kinds are pro Genus Eutolium MEEK, 1865 bably inseparable specifically at present. ... 373. Taxodonta and Isodonta from the jurassic Soma Group 117 Occurrence :-5til zone at Locs. 7, 8 and 1riangular, fairly large. deep. a little 6th zone at Loc. 1. posterior to umbo and extending pos teriorly: adductor scar fairly large. Family Limidae oblong. located in upper and posterior side. Genus Lima BRucvn';RE. 1793 Observation :-In most specimens the height exceeds the length but sometimes Subgenus Ctenoides MtlRcH, 18:13 they are nearly equal. The straight Lima (Ctenoides) tosaua Kr:--.rl:R.\ radial ribs are characteristic of this species. These ribs and their inter i95l. Lima (Ctenoides) /osana, KnmR.\. p. spaces become narrower on the lateral 349. pl. 1. figs. 22a, b. sides and the interspaces are wider than 1959. Lima (Ctenoides) tosana. TA:\Il:RA. p. the Tibs. Numerous concentric "fine 62. pi. 6. tigs. 44-47. threads in the interspaces are charac Occurrence :-An external mould of :1 teristic of Plagiostoma. The ribs are broken right valve from 5th zone at mostly flat-topped but fairly rounded in Loc. 2. some. Comparison :-Lima (Plagiostoma) paolii STEFANr:-.;r (1938) from the Somaliland Subgenus Plagiostoma SowERBY. 18H Jurassic is very close to it in general Lima (P!agiostoma) enormicosta feature but the flat-topped ribs. their irregular arrangement and wide inter TA.\lliRA, new species spaces distinguish it from paolii. Plate 19, Figures 32-34. Occurrence :-5th zone at Locs. 5. I. 8. DescriPtion :-Shell large to medium in size, moderately convex and most Lima (Plagiostoma) sp. convex at a little above mid-height. Plate 19. Figure 39. subtrigonal, height a little less than or nearly equal to length (70 mm long. 65 Shell large (80 mm or more high), mm high in holotype specimen); umbo slightly convex, oblong and higher than nal angle about 90"; anterior umbonal long: posterior auricle fairly large and ridge well defined and of moderate depressed; ribs Tidge-like, about 40. as length; lunule long; anterior auricle wide as their interspaces which bear much smaller than posteriot one which fine transverse threads. is indistinctly demarcated with shell This species differs from L. (C.J enor body; anterior margin straight; pos micosta in tall outline and mode of rib terior and ventral rounded but a little bing. Lima (P/agiostoma) paolii is closely concave in part below posterior auricle; allied to it in its shape, radial ribs and radial ribs about 30, fairly irregularly their number but their interspaces are disposed, flat-topped and narrower than punctated in that species. their interspaces; median ribs and inter Occurrence :-5th zone at Loc. 2. spaces wider than lateral ones; posterior auricle ribbed in same way but finer; Genus Ctenostreon d'Erc!IWALD, 1862 ·1unule finely striated but not ribbed; margin crenulated roughly; ligament pit Ctenostremz proboscidewn (]. So,uR BY) 178 Minoru T.-BIURA Plate 19. Figure 38. P/icatula dichotomoaJsla TAMt'I{A, 1820. Lima proboscidea . .T! SowERBY, p. 115, new species pl. 264. Plate 19, Figures 35-37. i 932. Ctcnostreon proboscideum, ARI-\ ELL. WJ .. p. 145. pl. 15, fig. 3. Description :-Shell large for genus 1935. Ctc>nostreon proboscidermt, Cox. L. IL p. (41 mm long, 36 rnm high in holotype), 1-1. pl. I. fig. 16. inequivalve, subequilateral, ovate, longer 1936. Ctrnostrc>mt proboscideum. DECHASEAL'X. c .. p. 43. than high and a little extending .pos 1952. Ctenostrrmt Pmboscideum, Cox, L. R.. p. teriorly; hinge-line relatively long and 64, pl. 5, figs. 13. 14. straight; dorsal and ventral margins rounded. Right valve slightly convex: .[!esniplion :-Shell small (ca. 45 mm attachrnent area narrow; radial ribs long; 55 mm high). moderately convex. about 20; much narrower than their appreciably inequilateral. irregularly interspac~s. dichotomizing ventrally, suborbicular in outline and higher than sometimes tuberculate or nodose but long; auricles and umbonal part un not spiniferous ; several concentric known ; ventral margin irregularly wrinkles intersect radials; internal ·rounded; radial ribs 10 or more, squa margin crenulate ; two ctenoria below mous, high. equal to or narrower than hinge deep and divergent. Left valve their interspaces, covered by concentric concave, ornamented as right valve . .growth-lines which are more conspicuous Obseroation :-External and internal on· sulci than ribs. moulds of nearly complete right valves Obse~L'lltimt :-A sole specimen at hand beside a few ·broken valves·are at hand. is probably an incomplete right valve The shell outline is very variable. The as judged from its obliquity. Whether holotype is longer than high and equi the number of its ribs serves for dis lateraL But lhe··height -often exceeds crimination from Ctenostreon is a matter the length and the valve is ·elongated of discussion. But it is undeniable that bac-kward. Most ribs dichotomize. the number varies in Ctenostreon. Ac Comparison:-This resembles Piicatula .cording to Cox (1952) radials are 12 peregrina o'01wiGNY and Plicatula cos~ in typical Ct. probost:ideum and 10 in smmmi LoRIO!- from the Callovian of typical Ct. pectitli/onne from the In Somaliland (STHANINJ, 1938) closely. Its ferior Oolite of the type· area (SE ribs are more numerous and mostly Germany). Some Indian pmboscideuni, dichotomize. The shell is plano-convex however, has 11 ribs. Therefore the in them. P. cochlear STEFASil"I (1938) writer referred the Soma form to P. from a little higher horizon than that proboscideum. The vertical r.mge of -of P. cossmmmi is more strongly convex pectiniformae does not extend to Malm. than this ~ies. .Cox placed that Occurrmce :-5th zone at Loc. 2. Re species into P. jJeregri11a (Cox, 1952). ported from upper Batho'Iii'an or Calio Occmnmce :-5th zone at Locs. 5, 7. vian to Rauracian of Asia and Europe: References cited Family Plicatulidae ARKE!.l., W. ]. (!929-37), A Monograph of British Corallian Lamellibranchia. Genus P!icatu/a L\MARcK, 1801 l-'alaeo11togr. Soc. Lrmdou. 373. Taxodonta and lsodonta from the jurassic Soma G1·oup 179 ' Cox .. L. R. (1935), The Triassk. Jurassic and species uf Trigo~ns from the and Cretaceous Gastropoda and Lamelli Jurassic of Soma, North J an. Studies bra!lchia of the Attock district. Palae- on the Jurassic Trigonia in Japan, onto/. Indica. N. S .. Vol. 20. Mem. :Vo. 5. Pt. 6. faP(ll!t Ju.u!i.• O,Oir(ie~•.. Vol~ 28.. (1952), The Jurassic lamellibranch LoRror .. P. et.'•Pr~Lr:tt, lj:. ·(1875)', D~scrip: fauna of Kuchh (Cutch). Pulaeontol. tion des fossiles. Mollusques Acephales. Indica, Ser. 9, .\'o. 3, Pt. -1. In P. de LORIOL and ~: PELLET, Mono· D~:c.HASEAUX, C. (1936). Pectinides jurassi· graphic paleontologique et geologique ques des lest du Bassin de Paris. .-lmz. des etages superieurs de Ia formation Pateont., Tome 25. jurassique des en\•irons de Boulognesur HAYA:\11, I. (1958), Some Hettangian Pele Mer. .Hem. Soc. Pi1ys. Hist. Nat. Geneve, cypods from the "Trigonia-sandstone ·: Tome 24. of the Shizukawa group in Northeast MAsATAl\1. K. (1950), A ·Study of the Ju Japan. Ja/Xl11. four. Geol. Googr., Vol. 29: . ras&ic Forma~ions in the SoV~a District, KrMURA. T. (1951), Some Pcctinids and a Fukushima Prefecture .. jour. Geol. Soc. Limid froin the Jurassic Torinosu Group JaPan. Vol. 56, l'{o. 662. in Japan. Jour. Fac. Sci. Uniz•. Tokyo, St;r. SowERnY. ]. (1820), Mineral Con_chqlogy of 2, No.7. Great Britain, Vol. 3, London. -- (1954), The Sandstone and Limestone .STEFAl\1~1. G. (1939), !'.,1oll.usc;hi_ Explanation of Plate 19 Grammatodmz takiensis KlliiU!~A Figs. 1, 2. Interriai mould and clay cast of. an, external mould oi a left \'alve; .·Loc. 1•2; x-1<5. (¥M3199). • . Fig. 3. lnter~al mo~_ld of a bivaly~ Fig. 10. hiternal mould of the holotype left valve (with thin test fragments); Lac. 1!;'; X 1.5. (MM3193). Fig. 11. · Internal mould of the holotype left valve (with thin test fragments); Loc. 15: xl.5. (MM3195). Parallelodon sp. aff. i11jlatus T.-\~lt;RA Figs:· l2. 15. Clay casts of the external moulds of left valves; Loc. 12; x 1. (MM3197, 3198). Figs: 13. 14. Internal mould and the external mould of a right valve; Lac. 12; x 1. (MM3196). Chlamys camptonectoide,~ TA~tlJRA. new species Fig. 16. Internal mould of the holotype right valve with thin test; Lac. 14; X 2. (MM3212). Fig. 17. Left valve; Loc. 15; xl. (MM3209). Eoper.ten Jnmdus (Kn.tt:RA) Fig. 18. Interior of a broken valve; Lac. 15; X I. (MM3222). Figs. 19. 21. Internal mould (xl.5) and clay cast of an external mould (X1) of a left valve; Loc. 15. (MM3221). Fig. 20. Left valve; Loc. 15; x 1.5. (.l\-1M3220). "AequiPecten" zwlgaris KJ:\IIJRA Fig. 22. Internal mould of a left: valve; Loc. 7; X 2. (l\1M3219). Clllamys (RaduloPeclen) ogawensis (KIMURA) Fig. 23. Internal mould of a left valve; Loc. 5; X 1.5. (MM3215). Fig. 24. Internal mould of a valve; Loc. 8; x2. (i\IM3216). ..• Figs. 25, 26. Clay casts of an external and an internal moulds of a left valve; Loc. 14: xl.5. (MM3217). H11lolium kimurai TA:I-IIJRA Fig. 27. Internal mould of a left valve; Loc. 11; X 1.5. (MM3224). Camptonectes sp. Fig. 28. Internal mould of a left valve; Loc. 7 · X 1. (Ml\13218). SamaPecten kamimatletiSis Kt~Tt:R.\ Fig. 29. Internal mould of a left valve: Loc. 8; xl. (:\L\13225). Chlamys sp. Figs. 30, 31. Internal moulds of right valves; Loc. 2, 5; xi. (MM3213; 3214) Lima (Piagiostoma) enormicosta TAi\IIIRA, new species Figs. 32, 33. Clay cast of an external mould of a left valve and an internal mould of a left valve; Loc. 2; X 1/2. (MM3226. 3227). Fig. 34. Internal mould of the holotype right valve; Loc. 2; X I. (MM3228). Plicatu/a dichotomocosla TA~tt.:RA, new species Fig. 35. Clay cast of the external mould of a right valve; Loc. 7; X 1. (MM3232). Fig. 36. External mould of a left valve; Lac. 7; X 1. (Ivil'.'i3233). Fig. 37. Internal mould of the holotype right valve; Loc. 7; x 1. (MM3234). Ctmwstreon proboscideum (J. SowERBY) Fig. 38. Clay cast of an external mould of a right valve; Lac. 2; X1/2. (:t-.iM3231). Lima (Piagiostoma) sp. Fig. 39. Clay cast of an external mould of a right valve; Lac. 2; X 1/2. (.Ml\13230). NttculatuJ (Dacryamya) sle11odolichos KIMURA Fig. 40. Inte·rnal mould of a right valve: Loc. J.l; x2. (MM3208). Eu/olium yatsu}itmse KL'RATA and K1~1l:RA Fig. 41. Internal mould of a left valve; Loc. 16; x2. (I\IM3223). All specimens here illustrated arc kept in the Geological Institute, University of Tokyo. T AMURA : Upper Jurassic Pelecypods Plate 19 Trans. Proc. Palaeont. Soc. Jap:m, N. S., No. 36, pp. 181-184. pl. 20, Nov. 30, 1959 :374. TWO NEW PERMIAN CORALS FROM YA}IAGUCHI PREFECTURE* MICHIHIRO KAWANO Faculty of Education, YamagUf.:hi University Lll IJt1 iUi1=!i!t~JlHlflilO) 2 tliflli: rLI I::!J!iUt$0)1iAJJltTN! H. ? kall(msis c ~Mlflllflil Pseudopat•ona /aisyakuana o.>tfill!fill P. tai· syalmana izutoensis ~&a~ l.d.: o c t, r:.lli!JEF®llfF-$o.>&1f:fMrflO) v :..- ;;(tt:PEK~ d: '> ~ v t: {,0)1:, C::.01iER~tJ>I;1;t Neoschwagerina margaritae (DEPRAT) ~~i'oOJl:lliH~I;t .::5!Hi:lr:fltfll c!: ~ ::t I; tL 7.> o ~I;*, PseudoPat•otza li taisyaJma11a 0) 1 li!!O).;j.:!J;:p.JRjCr:fli$J: l)if1~~~1.Lt,t.:, j'iiJ !llf iili !Jl, Introduction and Acknowledgements ,,,~·~o· ,J During the writer's geological studies ,.~- ~tma.~ Pre!eet.·.r"! of the Paleozoic rocks distributed in the ?vJino-Kanoashi l'vlassif in the western part of Shimane Prefecture and the northern part of Yamaguchi Prefecture, fossils of fusulinids and corals were discovered from the Izuto I i mestone. The limestone is a lens embedded in ·the Kane formation and has yielded corals of the genera PseudoPm•otta, Hua11gia ?, Waageuophyllum and others. among which two new species are described in this article. The Paleozoic formations developed Text-figure: Map showing the locality. in the southwestern part of the above stated massif have already been report· there are two limestone lenses, the ed by. the writer (KAwA:-.:o et al.. 1956). lower is known as the Kooda limestone Among the Paleozoic formations the and the upper the Izuto limestone. The Kane is particularly fossiliferous in its former is typically developed at Kooda two limestone lenses. The formation and consists of limestone conglomerate consists of sandstone, slate. chert and or limestone breccia, from which the limestone lenses. Its general strike is following fossils have been discriminat· 'N 40'-60oW, and inclines at angle of 50° ed, namely: -60'NE. constructing in the Kane dis Climacamilta sp. trict a monoclinal structure. Near Kane Oiawainella sp. * Received at Jan. 29, 1959: read at the Sclmbertella kingi DuNBAR and SKJX:"ER Annual Meeting of the Palaeontological Triticites cf. ellipsoidalis ToRJYAMA Society of Japan at Tokyo, Dec. 7. 1958. Sduvagerilta krotowi (ScHEJ.I.WJEr-;) 181 182 Schwq.gerina sp. Genus Ifmmgia YAnE, 1950 Pseudofusulina ·vulgaris (ScuEr~~,owic::-.:) P. vulgaris var. g!obosa _(ScHELLWIE:-.:) Iluangia? kanensis KAwA:-.:o, n. sp. P. vulgaris var. megaspllerica ToRI- Plate 20. Figures 3-8. YAMA Para[usulina sp. Corallum fasiculate, corallites usually Pseudodoliolina ? sp. aggregated cl~sely. Corallites rather Corals gen. et sp. i ndet. small, calicular diameter ranging from The lzuto limestone is developed at five to six millimeters at maturity. about 300 meters north of the Kooda Calyx· deep, wall thick. Septa in two limestone. This limestone is a lens orders. Major septa extend to central measuring about 70 meters in thickness area, some. unite dir~ly with septal and about one kilometer in length and lamellae of columella at matu'rity. not consists of white slightly crystallized joining wi~h-columella in young. Minor limestone barren of fossils· in general. septa short, developed at maturity. However, at the Abu limestone quarry, Columella solidified by stereoplasma, it contains small dark gray masses with loosely constructed and irregularly of densely crowded specimens of Neo axial tabellae and septal lamellae, schwagerina mmgaritae (DEPRAT), Para median plate present but not typical. fusulit~a sp., Sdzwageritw sp., and others. Dissepimentarium broad. Tabulae pre Hulmgia ? n. sp. was obtained from this sent but sparse. locality where it occurs in association In longitudinal section. dissepiments with Neoscluoagerina margaritae (Dc:PRAT). loosely arranged in one or two orders, About 50 meters north of the Abu lime their convex sides facing inwards. stone quarry there occur abundant re Tabulae arranged sparsely and descend mains of crinoid stems, Waageuophyl/um ing steeply towards columella. their con and PseudojJ(lJ}ona. the latter of which is vex sides facing inwards like dissepi described in this article. ments to construct central column. From the evidence afforded from the Calicular diameter and corresponding fusulinids, the Kooda and lzuto lime major septal number of each corallite stone indicate that the age of the Kane are as follows. formation is Middle Permian. · The writer wishes to express his most 2.8 mm ...... 12 4.0mm ...... l7 3.0mm ...... 14 4.6mm. . ..18 sincere th;.mks to Prof. Motoki EGucm 3.6mm ...... H 5.0 mm ...... 20 and ·Prof. Kotora HATAI of the Tohoku 3.6mm ....., ... 16 5.2 inm ...... 20 University, whO gave their kirid sugges 4.0 nun ...... 16 tions 'at:Jd criticism concerning the corals dealt with and read through the type Remarks :-In transverse section tl}.e script. present new species resembles Yatsengia asiatica HeANG, the genotype of Yatsengia Description of the Species Yo11 and llt:Al\'G, 1932, and Yatsengia ibukiensis MII"ATO. reported. from .the Order Tetracoralla HAECKEL Para[usuli1w zone of the Ibuki · djstritt and othe localities in Japan. ·But in Family Clisio.phyHidae NicHoLsoN longitudinal section;the present speei~s and T~OMSON, •1883 can be distihguished 'therefrom by the 374. Permian Cwals frmn Yamaguchi ..details of its structure, which are. most _parallel and slightly cur.ved. Tabulae .rela~ed .to _the. g_e_~us Huangia YAaE. ·and dissepiment~ pre.sept in .axial part 1950. The · c,ha.ract~rs.- d~~p·ibed · above ard sometimes in i!)terseptal part. are remote from any previously de· Remarks:-The ·genus Pseudopavmw scribed species of Huangia and there was originally established by Y ABE. fore. the writer refers it to the named SuGIYAMA and EGucHI (1943) based upon genus with the reservation that it may a hexacoral-like Carboniferous coral represent an undesctibe'd genus. ' from the Taisyaku limestone, and for it bccummce:-Limestone at the Abu the new family Pseudopavoniidae of the quarry, Izuto, · Kane District, Ato-cho, , order Haxacoralla was introduced by Yamaguchi Prefect'li.re. ,them .. · Hithert~ ···only the genotype, • .,... ' I , ' •- · Pseudopavona tai$Y{Jkumw YA BE, SuGt- ~·,ntA .and EGuc'H, · ~. been recorded Order Hexacor~lla f!,\ECI Explanation of Plate 20 Figs. 1, 2. Pseuclop(WOIIlJ taisyakua11a izutoensis KAWANO, n. subsp. 1: Longitudinal section: x-1 · . 2: Transverse section: x4 Figs. 3-8. Hua11gia? ka11e11sis KAw A:"O, n. sp. 3: Longitudinal section: X 4 4. 6. 7; Transverse section: x4 5, 8; Transverse and longitudinal sections: x4 K AWANO: Permian Corals from Yamaguchi Plate 20 Tram;. Proc. Palaeont. Soc. Japan. N.S., '1\o. 36. pp. 185-191. pis. 21. 22. Nov. 30. 1959 :375. ELECTRON-MICROSCOPIC FINE STRUCTURE OF FOSSIL DIATOMS. VI* Stereoscopic Observation HARUO OKCNO Kyoto University of Textile Fibers 1t1.JH~o:>ffi'rWJi~t(!((:J~~llti~· VI: ~ffil*''?'ffl-r-t--7-Jvllti77 t:1 :..-lllfftih' 15 iJl!l 0i11!.r.'iU!Eo:>J'.ll~±l:: ~1il;n: ~;t tt ~ lit*f>tft'Efflii Terpsilwe americana. Diml'rogramma dubium. Navicula maculata var. gigrmlea ..4mPhora proteus. Surirella striolula var. bret•is. Campylodiscus Kiitzingii &V' -t- 0iftifii! var. cocconeiformis 0)11Ff~fi!Qlf.Ji!'t!fill TM.rti.:t>J~ Ld:. ~[!]fJ: -t tt.ftto:>.ftE~~:::-:n '-rm.:rl1i~~Hlit1Lf*?4~H!Nm~l:: J: ~ tr'lf.iHi '· •. Hdllio:>i'£f*((~~~~m~.:t>1J·t..: IJ <. :b L- <. Jlf!lfJJ:lT ~c..!: n:t±HlU.:. !Jf:f'GI:.ffl•. 'f.:fEAH-.Ii;(± :~-:-o:>rl~\~!.IH'.·l:iTJ~*OO:tv-1-v-7 · 7J-:t':/~ft~8l!h"YJ ':7:..-t\;J: '>'*lrl~:t't.t.: t0"t'J~IJ .!Jj]J:(;0)$1~;&.1::ttG"C/'!f!O~~iO)!@:~i{i"~. !!'! !J.ff li: !tt This study is based upon the crude The formation is locally known as the diatomaceous earth· sent me from Mr. ·Truckee·, farther to the south the cor R S. l\IAcMJJ.LAN 1> in 1957. In his ex relating formation is known as the planation about the earth. he wrote as ·Esmeralda·. Numerous fresh water follows: "The deposit is located in the diatomaceous deposits occur in both state of Nevada, in Churchill County a,reas.'' about 15 miles south of the town of Fal _ The diatomaceous earth (Specimen. no. lon. It is thought to he either Upper DL-7243; Okuno-m 1168) is white powder Miocene or Lower Pliocene. I find this· Qf fine particles, and all the fossil dia occurrence to be most interesting of any toms found in it are salt-water littoral lake deposit which I have so far en f_orms, without remarkable dominant spe· countered. This is the only diatomite. cies. The earth is almost purely com of this character. in the · Basin and rosed of fossils of Terpsinoe americmut. Range Province'. so far as I know and Dimerogramma dubium, NatJirula macttlata I have examined several hundred occur and varr. acttla, gjga11tea, i11jlata, Amphora rences. No development has been done proteus. Surirel/a strialula var. brevis. on this deposit. It is badly contaminat Campylodiscus Ki4/zit~gii and var. cocconei· ed with acidic volcanic ash and has other fomzis. most of which are found in frag impunt1es. It was possibly deposited ments of their frustules or valves (Text· during the later brackish or saltwater fig. la). Judging from such components stage of a previously fresh water lake. and from the absence of fossils of plank 2 * Received Jan. 26, 1959; read at the 7lst tonic diatoms >, it may be fully conclud- Meeting of the Palaeontological Society of Japan, Sept. 27. 1958. at Kyoto. 2) For example. Aclin~cyclrts. /lctinoptycus. 1) The original collector of the present Arackt1oidiscus. 'Coscinodiscus, StepJwnopyxis. diatomaceous earth; Geology and Quarry ':[ricerqlium, which are often found predomi· Operation Dcpartmerrt. Great Lakes Carbon nantly- in many of the marine diatomaceous Cooperation. U.S. A. earth. 185 18() Haruo 0KUNO ed that the earth, whether it may be of 1908. Diat. mar. Franc~; pl. 90, figs. 5. 6. primary or of secondary deposition, is --BOYEI~. 1916. Diat. Phi lad .. pl.6. fig.lO; originated in a littoral saJt:\\;ater. 1926. Synop: North A mer. Ilia! .. pl. I. p. For the full elucidation of three di 145.-llt:sTEDT.l93U. Kicsclalg .. pt. l. p. mensional character and spatial relation 900, fig. 541.-MILLS, 193-1. Index. p. 1597. of the elements of fine structure of the -._-ZHt:SE, PROSCHKJ:-o:,\, SIIESIJL KOV :\, 1949. Diat. Taxonomy, pt. I. p. 169. pl. 10, frustules. I present here the electron fig ..3. --CLEVE· Et'LER. 1951. Diat. stereo-micrographs of all diatoms dealt Schweden u. Finn land, pt. I. p.l:?S. fig. 288. with. The pair of the stereo-micro graphs was obtained-by taking two plane : Frus~ules quadrangular ·in girdle view. micrographs of each .. frustule at the with sep_ta ingrowing :about ·haJJ:-, way same magnification.· tiiting·the frustule . into the·· valve. Height· of '.the 'fn1stule about 12 degrees in the electron micro about 80.u. Valves·eiJiptic. about' so.:I25tt scope. between the first and second ex long. and about 45--60.u bi·oad, with tri- posures. View each pair of the stereo undulate margins and rostrate ends': di micrographs through a stereoscope with vided by two septa into three1 segments. parallel or crossed' visual axes. _ By the Central area of the valve hyaline. round view with a stereoscope of parallel visu or irregularly bordered. Valve surface al axes. the image wi II be exactly the with radial rows of· fi.ne :rr·usttile: pores same as the explanati(m of the "inside' about 7-12 in lOtt. : Near::the end--of the view,; ·or' the "outside view .. in the valve. the rows of · phi'es: ·ufteti- inter Pl.ates'.l On the contrary. by .the view' rupted b'y a trans,rerse 11yalll1e'space. \Vlth a stereoseope"ofcrossed VIsual axes. Electron opt.ically. ·the· f1~ust'u!e jJore the image will_be opposite to tl~e ex-: seems to. be smile,(rJiat- locular.' closed planation. Further, one can get a stereo outwards by a tliih iri·egulai·I)• porous· image from the stereo-pair of the micro sieve membrane. mid opens·(~llmost' free-· graphs with the naked eyes. after suf ly ?) inwards with arotind 'opehing about. ficient training of the adjustment of eyes 200-400m,tt in diameter. hi the present· (cf. 0Kt::-:o, 1959, Bot. 1l1ag. Tokyo, vol. research, the details of the lateral wall ;-2. pp. lil-62.). of the loculus could not be discerned. I wish to express my thanks to :t\Ir. In many valves the sieve membranes R. S. l\L\cMILI.AN who kindly sent me are well preserved. the original sample. This research \vas aided by a grant in Aid for Scientific Research from the Ministry of Educa Dimemgyamma dubiwr1 'GRl':-:ow tion. Text-figures 1c, d; :flate ?L Figures ~a. b. Dimerogramma dubium 'GRU!\:0\\'.· VA=" Description of Species HEURCK, 1880-1, Syn. Diat. Helg.; pl. 36. fig . .18.--PER1\GALLO,l897-08. Diat. mar. Terpsinoe americana (BAILEY) RALFs France. pl. 82, figs. 8, 9.-llusTJo:DT, 1931. Text-figure• 1 b; Plate 21, Figure 1. Kieselalg., pt. 2, pJ122, fig. ,645 .. -MILLS, 1934. lridcx. p. 603. TerPsinoii americana (B :\ 1 LEY) R :\ L F s, A. ScmiiDT, 1895, Atlas Diat.. pl. 200. figs. Frustules quadrangular in girdle view, 9-13. -PA:>;TocsEK, 1903, Foss. Bacill. united in short chains: Valves~ linear, Ung., vol. I, pl. 6, fig. 53. -PERAG.\LLO, with parallel margins and cuneate ends; 375. Electron· Microscopic Fine Structure of Fossil Diatoms 187 Text-fig. 1. a. Crude earth (x50). b, Terpsinoe americana (x500). c. d. J>imerogramma dubium (c. Valve view. d, Chain of frustules. x500). e . .4mpltora proteus (X400). f. Surirel/a slriatu/a var. brevis (x500). g, Campylodiscus Kiitzingii ( x800). h. var. cocconeiformis (X 1000). (a-1:, Lig!1t _micrographs) about 80-90.tt long_ and 7-lO,tt broad. broad basis and a pointed or truncate Pseudoraphe narrow.· about ·().3:U broad, end. Electron micrographs of such ·den sometimes ind isti'nct. Electroil·optical tiform spines of .Fragilai:ja constrzeens, ly, the frustule pores rounded-rectangu crotmumsis and Cymatosira 'belgica · are lar or elliptic, about 450.:660m,U long and published by HEL~tcKE ~n~ KRIEGER in 200-330m.u broad, arranged in transverse their Diat. Elektr. Bild. pt. 2, pis. 141. rows about·7~10 in-lOp. -The-pores-seem 142. 149:- to be more or less locular. closed pro bably outwards by a thin sieve mem brane with nelveins. and ope!Jed freely, Navir:ula macu!ata (BAtLEY) CLEVE probably inwards. In many valves. the var. gigantea 0KuNo sieve membranes are 'wen' preserved. The valve,- on its margin, with an an Text-figure 2A; Plate 21, Figure 3 .. nular row of .dent_if_orm spines.. The ·.v~vicula maculata (BAILEY) CLEVE var. gig spines lamellar, about 2.5.u .long, about antea 0Kc;.;o, 1956, Trans. Proc. Palaeo11t. l.u broad. and s...:10 in JO.u; each with a Soc. Japan, N. S., No. 21. p. 134, text-fig. 1, 188 Haruo 0KUNO pl. 22, figs. 5a-c. a complex structure of the frustule pore as shown in Text-fig. 2A: The frustule I already reported some fine structure pore is Jocular, somewhat deep funnel of th.~ .frustule wall of the present va: shaped, and seems to be partition~d by riety revealed by the electron plane= a half -clos!'!d central membrane· into the n1icroscopy (OKu:No, 19B6). In the present outer and inner vestibules. The outer eleCtron stereo-microscopy, I could find vestibule infundibular, ope!1ed almost :r~.x~·fig. 2.·. Di~gram of the fine struc.ture of loculi. partially presumedly represented. A .. Nal'ic11la macula/a var. gigantea (cf. Pl. 21, fig. 3). B, Amphora protetis (ct."' PI. ·zz·. fig. 1). ca. Ccnhal area.· nn. Central memhriu1c. co, Ccritral opepi_ng. · im, liiner.membrane. io. Inner opening. it•. Inner vestibule. om. Outer membran~. 00, Outer opening. 01'. Outer vestibule. rl. Radial.iamella. sm.~Sie\·e membrane.- sp, Sieve pore. Explanation of Plate 21 Pairs of electron stereo-micrographs. Fig. 1. Terp~·inoe-tlJ'IU'Ticana (R.AILEY) RALFS. Valve: inside view. (x12500) . Figs. 2a, b. Dimerogramma dubinm GRt;l'OW. a, Girdle and mantle; inside vie~? b, Valve margin, showing spines. (a, x4500. b, x6000) ' Fig. 3: Navicula maculaia (BA 1LEY) CLEVE var. giga11tea OlwNo. Valve; outside view. ( x 7500) Loc. (Figs. 1~3) · 15 miles south of Fallon, Churchill Country, Nevada. U.S. A. OKUNO : Fine Structure of Fossil Diatoms Plate 21 '' r~ I ) $ ' ' ·:1 ~ ·.? ' ~ ' .:• t. ,...... -: :,i') ~ .. ~) .~ \ IJ) ':e ) ' ,_. ·, :J .. • ~ ~·I "' :«t f'h ~\ m .;;-, • *l ;Jit ;.j\ *· :tl ~ .,.; ...... ' ••• ~· ~ '1\ .... ~ , ...... ~ ~I ~ ~\ :t. I 375. Electron-MicroscoPic Fine Struditre of Fossil Diatoms 18:1 freely outwards, and more or less closed Ius with a linear opening, about 100- inwards by the central membrane. The 200 1111.1 broad : the inner sieve membrane inner vestibule probably cylindrical, is perforated by numerous round sieve with · marginal radial lamellae which pores arranged in three lines (about 40- divide the vestibule into about 7-12 50 in l,u) decussating at about 60 de sectors. The inner and outer vestibules grees (Text-fig. 2B). In many valves the communicate each other through the inner sieve membranes are lost. In liv central opening. The bottom of the ing forms of Amphora ova/is and var. inner vestibule is incompletely closed pediculus. the sieve membranes of the by a delicate inner membrane with radi same structure were found by Hr:c:o.tcKE al and marginal slit-like sieve pores of and KRIEGER (Diat. Elektr. Bild. pt. 1. pl. various shapes and sizes (cf. 0Ku:-~o. 1. c .. 77. pt. 2. pl. 181). text-fig. lB). The central area of the inner membrane usually roun.d, scattered Surirel/a stria/uta TuRPI:-: var. with fine sieve pores. The fine structure of the type species, varr. aruta, in/lata brevis (EHRENilER<.) D1:: ToNI are found to be the same to the present variety. Text-figure lf·; Plate 22. Figure 2. SurireUa strial1tla TuRPI:-: var. brevis (EHREN BERG) DE To;-.;1, AzPEITI.-\, 1911. Diat. A.mp/wra proteus GREGORY Espanola. p. 200, pl. 12. figs. 8, 9. - Text·figures 1e, :.m; Plate 22. Figure i. MILLS, 1934, Index, p. 1540. Amphora proteus G11EC.ORY, A. ScliMIDT, 1875. Valves broad obovate: 48-lOO,u long, Atlas Diat., pl. 27, figs. 2, 3. 5. 6. --MILLS, 48-80,u broad. Wings indistinct. Costae 1933, Index, p. 180.-LAVTIENKo. 1951. about 7-10 in lOO,u. with distinct rows Freshw. Diat.. p. 415. pL 257, fig. 1. of striae (about 7-9 in lO,u) between Amphora proteus var. Kari11a GIHJNow. 1880. each two costae. Central space more or Arct. Diat., pl. 1. fig. 7. less broad lanceolate. Valve surface AmPhora Proteus var. oculata, PERAGALLO, 1908, Diat: mar. France. pl. 44, figs. 21, 22. scattered with fine spinules. This va riety can be distinguished from the type Frustules elliptical in girdle view, species by its broad central space. Elec with truncate ends. Valves lunate. each tron optically, the radiating intercostal with slightly concave or almost straight spaces were ellucidated to be incomplete ventral margin and convex dorsal mar ly locular, closed outwards and ope1~ed gin: length 120-130,u. breadth 20-25,u. freely inwards. The loculus shallow near Raphe biarcuate. Central hyaline area the central area and deep to the valve distinct on the dorsal side. Axial area margin. The outer closing membrane indistinct on the dorsal side, broad and of the loculus is perforated by 4-8 trans irregularly bordered on the ventral side. verse double rows of round sieve pores Frustu Je pores arranged in transverse about 50-lOOm,u in diameter. In each or slightly radiating rows, about 8-10 row, the pores about 5 in l,u. HELMCKE in IO,u. Electron optically, the frustule and KRtEGim?s electron micrograph of S. pores locular, linear or linear elliptical, striatula (living form) in their Diat. about 0.5-3.0/.l long and about 0.5-1.25,u Elektr. Bild. pt. 2, p. 18, pl. 200, sfiows broad. The outer membrane of the locu- sieve pores without closing membranes 190 Haruo 0KUNO as those of the present fossil. side of the valve) provided with radiat ing rows of some\vhat deep. rectangular loculi about 300-2000m.u long .and 200- Campylodiscus Kiitzingii 250mtt broad ; the finely porous mem BAILEY et I-L,RvEY brane (probably the concave side of the valve) provided with radiating rows of Text-figure 1g; Plate 22. Figure 3. round pores about 100-200mtt in diameter. Campy/odiscus Kiitzingii BAILEY et HARVEY, In many valves, the finely porous mem PA:--:TOCSEK, 1903, Foss. Bacill. Ung., brane is completely lost. vol. 3, p. 26. pl. 30, fig. 433. --MILLS, 1933. Index, p. 343. References Campy/ndiscus striolatus GRliNO\\', A. ScllMIDT, 1878, Atlas Diat., pl. 53, figs. 1, 2. DESIKACHARY. T.V. and ALEEM. A. A. (1955). Electron microscope study of diatom wall Valves elliptical or suborbicular, 17- structure VII.. Jour. Sci. & Jndu.~t. Res., 50tt long. and 16-60tt broad: transapical 110/. 14 c. pp. 42-46. axis is longer than the apical axis. Frus DESIKACHARY, T.V. (1957). Electron micros tule pores arranged in slightly radiat copy and Algology. Proc. Ind. .4cad. Sci., ing rows about 13-18 in lO.u. vnl. 46, pp. 54-64. GERLOrF, ]. (1957). Electroncnmikroskopische var. cocconeiformis OKuNo, var. nov. Untersuchungen an Diatomeenschalen. I. Dcr Bau der Schale von Guinardia ftaccida Text-figure 1 h. (CASTR.) PERAGALLO. Ber. De11t. Bot. Ges., l'ol. 69. pp. 499-504. Valvae cocconeiformes. ca. 17-50tt KoLBE, R. W. (1956). Zur Deutung und Au longae. ca. 16-30tt latae: axis apicalis swcrtung elektronen- mikroskopischer longior quam axis transapicalis. Aufnahmen in der Diatomeenkunde. Bot. In this new variety, the apical axis Not., t•nl. 109. Fasc. 3, pp. 368-373. of the valve is always longer than the MAcl\·IJLLAN. R. S. (1956. 57), Personal com transapical axis. and the valves are el munications. liptical as in Cocroneis. OJ\Ul'\0, H. (1952). Atlas of fossil diatoms Specinien. no. mll72-type: Photo, no. from Japanese diatomite deposits. LM. 2199. -- (1955-59). Electron-micro!'copical study on fine structures of diatom frustulcs. Both in the type species and in the Xlll-XVIL Bot. i"fag. Tokyo, t·ot. 68. pp. new variety, the valves seem to be dou 125-128, 1•ol. 69, pp. 186-192, l'ol. 70, pp. ble-lamelliferous. having coarsely and ]01~107. 216-222, L'O/. 72, pp. 61-67. finely porous membranes. The coarsely -- (1 9 55-58), Electron-microscopic fine porous membrane (probably the convex structure of fossil diatoms. III-V. Trans. Explanation of Plate ~2 Fig. 1. r1mp!wra proteus GREGORY. Valve. ( x 15000) Fig. 2. Surire/la stria!11la TuRPIN var. bnmis (EHRENBERG) DE To:-;1. Valve; inside \·icw. ( x3000) Fig. 3. Campy!odiscus Kiilzingii BAILEY et HARVEY. Val\•e; inside view? (x3000) Loc. (Figs. 1-3) 15 miles south of Fallon, Churchi II County, Nevada, U.S. A. OKUNO : Fine Structure of Fossil Diatoms Plate 22 375. Electron-1Vlicroscopic Fine Structure of Fossil Diatoms 191 Prnc. Pa/aeont. Soc. Japan, N.S., No. 19, -- (1955). Plankton diatoms of Black Sea. pp. 53-58, No. 21, pp. 133-139, So. 31, pp. SKvoRTzov, B. (1937), Neogene diatoms hom 237-242. V{amura, Nagano Prefecture. Central -- (1956), Diatomaceous earth in Yatsuka Nippon. Mem. Col/. Sci. Kyoto linp. Univ. mura and Kawakami-mura. Okayama S~r. B. 1'01. 12. pp. 137-156. . . Prefecture. ]our. ]apna. Bot., vol. 31, pp. -- (1937), Neogene diatoms from Saga Pre 345-350. fecture. Kiushiu bland. ~ippon. l. c., vol. -- (1958), Diatomaceous earth in Setana· 12. pp. 157-17-1. cho, Hokkaido. 2. l. c .. rol. 33, pp. 193-198. S.\IITH, W. (1853, 56). Synopsis of the British -- and KolWSAWA. K. (1957). Index of dia· Diatomaccae. 1. 2. toms researched with the electron mi TSD!l:RA. K. (1955), A contribution to the croscope. 1. Bull. Fac. Text.·Fibers. Kyoto knowledge of diatoms found in the clod Uni11. Ind. Arts & Text.-Fibers. z•ol. 2. pp. from the pond on Mt. Shichimen-Zan, in 43-58. Japan. four. Yokohama !vlrm. Univ. Ser; RAPIER, P.M. (HJ55), The indomitable diatom. C-12, no. 43, pp. 1-32. Eng. & illin. ]our., vol. 156, pp. 90-93. WoLJ.E, R F. (1894), Diatomaccae of North PA:- . ' PROCEEDINGS OF THE PALAEONTOLOGICAL SOCIETY OF JAPAN 1:3 ~i~l1:~~~~ 74 IDJfYIJiw:._I959 iF IL fl 21 Pelecypods of the Jusanhama Group E:l. m~:k"PJm'-1~Jt!!1!(ct-~~~~~~.: t-J ~, -c~mlll1 (Purbeckian or Wealden) in Northeast ~ :tt t~ .''(~~~ ·14 i\) . . . Japan ...... Itaru. HAY AMI !f'.~~JIJ,i!W!ili Lower Liassic Lamellibranch Fauna of i!ilJJ~ft:JifHtiUf~O)-/j~;iia ..... , .. tllf4io..:''J the H igashinagano Formation in West B*0~-==:~ci'M1jg:1H'LID.ft:fi · · · .i'Jt~!f m Japan ...... Akira TOKUYA~IA 1i~:!f~O).~~Jf!il ...... : ... : ...... ·'*lllt/'Ji:tm ~tJ:liiJII!.::I;!t~~(}) Nautiloid 0)-f(fil! .... ~~~llii ...... I=PIR4':.:: JKdililfltflffi!ftl'Jt!!@O).::~'t~O)*'j~!IJ. : :!llf .l:')f'l1: Some Ordovician Fossils from East Ton- llayasakaPora, a New Permian Bryozoan kin. Viet-Nam ...... Teiichi KonA YASIJJ Genus from lwaizaki. Miyagi Prefecture, lih#ifii'iV !llfd~ Upogebia !ram:awae. n. sp. Japan. (ft.J'i) ...... Sumio SAKAGAW (~~) ..... ' ...... ' ...... ·~~UJ!!l NiPPonosfetlopora. a New Carboniferous Stego/opl10don pseudo/atidens from the Bryozoan Genus from Fukuji. !Iida Miocene Yokawa Group in Toyama Pre· Massif. Japan. (~iflt) .... Sumio SAKAGAMI fecture, japan ...... Brachiopoda from the Permian Maizuru ...... Fuyuji TAKAI and Shoji FuJII Group (1) ...... Daikichiro S11rMrzu ~lJif>;:tA:ttll~~1tllO).ff:!4. c JEtf)1J".IfT · · · · · · · · · · 'I'WIII!!IJ· 17 l!€ili't 7.> ifiXI4'lliiJf!(Jft:fi0~7.> b (}) ...... -...... 111~ f!l! • 'Sn i't'i It:-:>~' -c ('§!fl!ffii'J· 17 iiEI.Ii '1' 7.> {t:fijb~/lHf.!t.: Mesozoic Plants from the Yatsushiro "':)t '"'C. ~(}) 1) ...... ~ff Ill Formation (Albian), Kuma District, Kyu lltli4i~llffi!G.!/I!Iwt0) ltEil'fl.: ··:n' -c .. ,M(tllli'l.:: shu, Japan. (ftiflt) ..... Tatsuaki KIMURA .lliM!~IIjll'fi!f'W Pectinidae ...... *~U II I'll= Mesozoi'c• Plants from the Itoshiro and Upper Cretaceous Ammonites of Califor· the Akaiwa Sub-Groups. I. Bennettitales. nia, Part Ill...... Tatsuro MATSUMOTO (Mesozoic Plants from the Tetori Group, 1'1 Ji!Hc=fl.l:fl' 0{tw F1 H'H: ~ (})~i! 1.:? ~ '-c Central Honshu. Japan, Part III). (~~) ...... ~~fJ'(;ift ...... Tatsuaki KIMURA and Shinji SEKIDO Zonation of the Non-Marine Upper Meso· ~f:ifijilli'iJ~BUIBJ7JaF~f.ftf~l£l1±1;: t '-c (ft zoic Wakino Subgroup ..... Yoshihisa OTA :EEt~~(})mrwmtrdilrBWdmm;ti vn.) .. J!!l!f lfltt Zur Kenntnis der Oxytominae (Lamelli· JX~il:l~*C)~QJ1Ef0ft.1i ... · · · · · · .11lJ~B=M branchia) ...... Koichiro ICHII 'ijl;.fjf~ L'!~l;ti!f~iH~IC:IiiJ> ~ iX(})'jP.~·~5E Ld:, 1JiJI H:l!l:Kil:iH~*il!.fl~it(})IVfjt .. tl *&U.It7) 9 f18'.9I~~;(,(})!Vfjt .. -t-l11~1!flT 7.> L c c Lt:, ,_ - _II!_~__)&_-- Ill! fill 8 ilti!i{$~*iWB I 195!) ll!ft0. if~ I .lt! ~t * ~r- I 1960 4' I R 16, 17 II I - 1959 ~~~~2 fJ 2-0-;- I £:UhiHliU<l NEWS «:» 1!-158 1f- lleerlen -cmlllt! tc .h t.:tl~ -1 @lfr~~.fi J;X~~fii:~f:Jt!!i!f~:~~~ fi FR~cmt~t~t.:.rXJ-t ¢ ~ ~~-c Carboniferous 11 system -c ~ 'J, :ttL ~5t;lllll- -c t J: 1. 'i~'·.:f:~5fjl;ll l-t.: (,~It subsystem c l.. -em .lbo~~-ct.c~·.!:ikiELt.:. ilit--:.hi.:.l:t7 ;~ 1J 7Jfi'~ll I H 5 9 1f'· 11 .f.! 25 lJ JfDi< :;k $J11$ 00ttMt$ift< :¥. ~ 1 9 5 9 {f'· 11 .11 3o a fl * }j ~f:. ¥q ?'{: ~ ~;3 1.t ;KJ ~~:j )I' ~ JC fr ~ r!i Jll ~ it (~ ff J1 1¥. 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