the echinoid fauna from japan and adjacent regions part i

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230 S. NISIY AMA d .e a f Fig. 16. Temnotrema rub rum ( DODE RLEI N, 1885). (Recent s pecimen, from U bara Bay, Chiba Prefecture, in 5 metres; for comparison) . a. Apical system. x 10; b. T wo in terambulacral plates at the mid-zone, x 10; c. Two ambulacral plates at the mid-zone, x 10; d. Aboral v iew of holotype, x l (after D6DE I
The Echinoid Fauna from Japan and Adjacent Regions 231 ous as those of the outer series. Gill-slits quite obsolete. Valves of small globiferous pedicellariae with the flattened and widened blade. No recorded as fossils. In possessing the test with very small pits and a distinctly limited naked area in the midline, this genus has resemblance to the genus Microcyphus AGASSIZ, 1841, as to the habits, but this genus is easily distinguished from the latter by distinctly biserial arrangement of the pore-pairs and much more numerous coronal plates. From the genus Amblypneustes AGASSIZ, 1841, this genus differs in having the median space of aboral interambulacral areas is more or less extensively bare and free from spines and tubercles. This genus contains a well known and very diversified species, M. globulus (LINNAEUS, 1758) (with some varieties), and a doubtful species (or subspecies of that species), but there has been no record of occurrence as fossils from anywhere. The very characteristic structure of the naked part of the coronal plates, i. e., a peculiar porous-radiating structure, was noticed first by MORTENSEN (1943, p. 177). This seems to be a peculiar feature among the test-structure of the Echinoids. There are fragmentary specimens of a species of this genus in our collection, derived from the' Raised Beach deposits' of Central Japan. They are not regarded as fossil in a strict sense, but for convenience's sake they are described herein. Mespilia globulus (LINNAEUS, 1758) (PI. 6, fig. 1) Mespilia globulus (LINNAEUS) AGASSIZ and DESOR, 1846, p. 358, pI. 15, figs. 17-17a.-A. AGASSIZ, 1872-74, pp. 143, 477, pI. 6, fig. I, pI. 8a, figs. 13-14, pI. 8c, fig. 14, pI. 38, figs. 22, 22a-c.-BELL, 1880-d, p. 434.-BELL, 1881-b, p. 433.-MACKINTOSH, 1883, p. 255, pI. fig. 31.-DoDERLEI"i, 1885, p. 95 (24).-DE MEIJERE, 1904, p. 87.-MoRTEl\:SEN, 1904, p. 96, pI. 6, fig. 17, pI. 7, figs. 16, 22, 23, 47.-ToKUNAGA, 1906, pI. 8, figs. 17-19.-H. L. CLARK, 1912-b, p. 322.-H. L. CLARK, 1925, p. 93.-KoEHLER, 1927, p. 88.-RoxAs, 1928, p. 256, pI. 2, figs. 7-9.-IKEDA, 1935, p. 422.-MoRTENSEN, 1943, p. 177, pI. 12, figs. 1-17, pI. 21. fig. 19, pI. 45, figs. 9, 18, 20, 32, text-figs. 47c, 48c. 96, 97a-b, 98a-b, 99, 100-102.-H. L. CLARK, 1946, p. 315.-UTINOMI, 1954, p. 347. M espilia levituberculatus Y OSIllW ARA, 1898, p. 58.-TOK UN AGA, 1906, pI. 8, figs. 20-23. Salmacopsis pulchellimus YOSIIl\\' ARA, 1898. p. 59. Locality and geological horizon.-IGPS loco no. Ch-27.-Small cliff of the River Heguri at Kuwabara, H6j6-machi, Tateyama City, Chiba Prefecture. (tm Nago, Lat. 35°0'23"N., Lat.l39°53'08"E.). Raised Beach deposits, early Holocene. Hypotype.-IGPS colI. cat. no. 78305. There are several fragmentary specimen referred to this species at hand, the largest one consists of one ambulacra and one and a half interambulacral areas. Ambulacra broad, as broad as, or more or less narrower than, the interambulacra, 7 mm wide at the ambitus; ambulacral plates low and broad, 3.5 mm wide and about 1 mm high at the ambitus, composed of three components, a middle demi-plate component and aboral and adoral primary components; pore-pair of middle demi-plate component placed outside as broad as the distance of pores of a pair, and pore-pairs of aboral and adoral primary components arranged in a single series, as pore-pair of adoral primary just superposed on pore-pair of aboral primary of the successive
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PALAEONTOLOG1CAL SOCIETY OF JAPAN S
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2 S. NISIYAMA knowledge by detailed
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8 S. NISIYAMA The latter tribus cor
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The Echinoid Fauna from Japan and A
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20 S. NISIYAMA in no other Cassidul
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22 S. NISIYAMA peripetalous fasciol
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24 S. NISIYAMA Family: Fibulariidae
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.26 S. NISIYAMA impractical since i
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28 S. NISIYAMA Arbacioina GREGORY,
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-30 S. NISIYAMA ordinal ranks in th
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32 S. NISIYAMA axis. . . . . . . .
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34 S. NISIYAMA Scaphechinus A. AGAS
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"36 S. NISIYAMA Aphelaster tosaensi
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42 S. NISIYAMA formation of Nakamin
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50 S. NISIYAMA Preuss. Ceo!. Landes
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54 S. NISIYAMA general d' Actinolog
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58 S. NISIYAMA ---, 1907, Gli Echin
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·64 S. NISIYAMA ----, 1957, Echino
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66 S' NISIYAMA die (Compte rendus d
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70 S. NISIYAMA Bull. Mus. Roy. Hist
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The Echinoid Fauna from Japlln and
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76 S. NISIYAMA London, Zoo I., vol.
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'90 S. NISIYAMA Mag., London, Whole
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The Echinoid Fauna from Jap,lll and
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'96 S. NISIYAMA 4, va!. 24, pp. 604
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100 S. NISIYAMA cretacique du Portu
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102 S. NISIYAMA ---, 1845-a, Observ
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112 S. NISIY A:VIA NICHOLAS, H., 18
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116 S. NISIYAMA ---, 1894, Fische,
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120 S. NISIYAMA ---, 1949, Los equi
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128 S. NISIYAMA ---, 1908, Die Diad
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130 S. NISIYAMA ---" 1870, Descript
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132 S. NISIYAMA ---, and M.N. BRA:-
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134 S. NISIYAMA ----, and C.W. DROO
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144 S. NISIYAMA ----, 1947, Ecologi
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146 S. NISIYAMA OYAMA, K., 1950. St
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148 S. NISIYAMA SUGAI, K., et alt.,
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150 S. NISIYAMA Stratigraphic Studi
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158 S. NISIYAMA general conspicuous
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164 s. NISIY AyIA acteristic purpli
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170 S. NISIYAMA This subfamily does
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172 S. NISIYAMA the Miocene forms,
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174 s. NI SIYAMA large Cidarid are
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176 S. NISIYAMA diadematoid structu
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Plate 1
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Plate 2
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Plate 3
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s. NISIYAMA The Echinoid Fauna Plat
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Explanation of Plate 4 (Size as sta
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Explanation of Plate 5 (Size as sta
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Plate 6
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.. Plate 7 ..
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s. NISIYAMA: The Echinoid Fauna Pla
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s. NISIYAMA The Echinoid Fauna Plat
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s. NISIYAMA: The Echinoid Fauna Pla
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Explanation of Plate 10 (Size as st
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Plate 11
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S. NISIYAMA : The Echinoid Fauna Pl
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Plate 13
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Plate 15 .
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