the echinoid fauna from japan and adjacent regions part i

The Echinoid Fauna from Japan and Adjacent Regions 215
1778) on account of the series of primary tubercles and the angular pits on both
interambulacra and ambulacra. A specimen reported by COOKE (loc. cit.), as Tem.
toreumaticus (LESKE) varieties, from the Pliocene of Okinawa (USNM coll. no. 561554)
seems to have a delicate test, and the angular pits on the oral side are rather distinct,
and, thus, it should not be safely ascribed to this species.
This diversified species, is widely distributed in the water over the Indo-West
Pacific regions, from Central japan (Tokyo Bay at the Pacific side and Toyama Bay
at the japan Sea side) to East Africa in the west and to Australia in the south;
from the ebb-zone to 45 metres depth. This species dates back to the Miocene, which
is the oldest age of the genus, and has the widest geographical distribution.
Temnopleurus hardwickii (GRAY, 1855)
(PI. 4, figs. 8, 9, 13, PI. 5, figs. 1-2)
Toreumatica hardU'ickii GRAY, 1855, p. 39.-Temnopleurus hardwickii (GRAY) A. AGASSIZ,
1872-74, pp. 166,460, pI. 8a, figs. 1-3.-A. AGASSIZ, 1881-a, p. 120.-Temnotrema hardwickii
(GRAY) POc.1EL, 1883, p. 87.-Temnopleurus hardwickii (GRAY) MORTENSEN, 1904, pp. 61
65, pI. 6, figs. 32, 34, pI. 7, fig. 21.-H. L. CLARK, 1908, p. 304.-LxvIBERT and TIIIERY, 1911,
p. 218.-H. L. CLARK, 1912-b, p. 312.-DJAKONOV, 1923, p. 279, pI. 1, fig. 3.-H. L. CLARK,
1925, p. 80.-MoRTEKSEN, 1929, p. 478, pI. 19, fig. 3.-Temnotrema hardwickii (GRAY)
LAMBERT and JEAl'iNET, 1935, p. 6.-Temnopleurus hardwickii (GRAY) NISIYAMA, 1937,
p. 52.-MoRTENSEN, 1943, p. 84, pI. 1, figs. 4, 5, pI. 2, figs. 16-18, pI. 3, figs. 21-30, textfig.
53a.
MicrocYPhus elegans A. AGASSIZ, 1863-a, p. 357.
Temnopleurus japonicus vo""' MARTENS, 1866, p. 55.
Temnopleurus toreumaticus IVES, 1891, p. 214 (partim).-TOKU?\AGA, 1903, p. 5 (non LESKE,
1728).
Non Temnopleurus hardwickii STOCKLEY, 1927, p. 114, pI. 21, fig. 3 (= Tem. toreumaticus
(LESKE, 1778».
Locality and geological horizon.-IGPS loc. no. Ch-25.-Roadside cutting near
Somei, Tako-machi, Katori-gun, Chiba Prefecture. (tm Narita, Lat. 35°44'03/1N., Long.
140027'36/1E.). Narita formation, Pleistocene. Hypotype.-IGPS coll. no. 27439.
Locality and geological horizon.-IGPS loco no. Ch-26.-A point near Asakura,
Chiyoda-mura, Sambu-gun, Chiba Prefecture. (tm Narita, Lat. 35°43'26/1N., Long.
140024'13/1E.). Narita formation, Pleistocene.-IGPS coll. cat. no. 22242.
Locality and geological horizon.-IGPS loco no. Ty-12.-Shinagawa in Tokyo. (tm
Tokyo Seinanbu (Tokyo Southwest), Lat. 35°37'34/1N., Long. 139°44'30/lE.). Tokyo
formation, Pleistocene. Hypotype.-IGPS colI. cat. no. 58345.
Locality and geological horizon.-IGPS loco no. Kn-12.-North side of Kagetsu·en,
Tsurumi Ward, Yokohama City, Kanagawa Prefecture. (tm Yokohama, Lat. 35°30'N.,
Long. 139°40'04/1E.). Tokyo formation, Pleistocene. Hypotype.-IGPS colI. cat. no.
58344.
There are five specimens referred to this species at hand, ranging from 33 mm
to 45 mm in horizontal diameter, and these were yielded from the Pleistocene of
Kant6 region, Central japan.
Dimensions are: