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Fj -Lt fJ -lt"' -I;±~~~ ~.:k· ic.lJ 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<f(I;J: C ~1i"C''f!flllf!'lllfil•f,¥fH!.i·* nt: c. cO)t.;;t' t OYC. :.~1-r;;G~t.,., (Jj:-tt-c~itl!.illlJ:O)t.lJ:~tW f€:11!!~0'¥-~ll!!fffO)itl!'l't~ftt:: "?~ •'L~& v L 2 f'i!G)4:Jl ~r.;t'lfrf!f\<::. kobayashii t fia~ t.,. t:. riu El:l Jllj Ql.l 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.
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