the echinoid fauna from japan and adjacent regions part i

224 S. NISIYAMA
part by a sinuous line................................ Temnotrema sculptum
2. Pores rather large; ambulacral plates rarely lower than the interambulacral ones.
Secondary tubercles rather distinct. Test red in colour; the spines red with
white bands. Ocular pore concealed by a knob ........ Temnotrema rubrum
MORTENSEN (1904, p. 86) suggested that there may be two more species of Temnotrema
in the Japanese seas. The one resembles sculptul1l, but differs in having
larger pits and fewer tubercles than the latter; the other is closely related to rubrum,
but differs from it in having distinct white patches on the adapical portion of interambulacra
and on both ambulacra and interambulacra at the ambital region. Unfortunately,
they lack the apical system, and the writer cannot decide the specific
validity of these specimens.
There are two species of this genus occurred as fossil in Japan; they are described
in the following lines.
Temnotrema sculplum A. AGASSIZ, 1863
(Text-figs. 10-14)
Temnotrema sculpta A. AGASSIZ, 1863-a, p. 358.-H. L. CLARK, 1912-b, p. 321, pI. 112, figs.
1-2.-Temnotrema sculptum A. AGASSIZ: H. L. CLARK, 1925, p. 92.-MoRTENSE2\', 1929, p.
474.-NISIY AMA, 1936, p. 121, pI. 11, figs. 1O-16.-NISIY A\IA, 1937, p. 53.-H. L. CLARK,
1938-a, p. 388, pI. 26, fig. 6 (Japan).-MoRTENSE:", 1943, p. 249, pI. 19, figs. 1-2, pI. 45,
figs. 1-3, 15, text-figs. 133a-b, 134, 135a.-UTINO:VII, 1954, p. 347.-COOKE, 1954, p. 46, pI.
9, figs. 2 (?).
Temnopleurus hardwickii SLADE:", 1879, p. 436 (non GRAY, 1855).
Pleurechinus bothryoides A. AGASSIZ, 1881-a, p. 108 (partim), pI. lOa, figs. 1-2 (non AGASSIZ,
1841, nee 1846).-ToKUNAGA, 1906, pI. 8, figs. 11-12.
Pleurechillus variabilis DbDERLEI2\', 1903, p. 706 (partim), pI. 61, figs. 5a-b.
Pleurechinus variegatus MORTE:"SEN, 1904, p. 84, pI. 1, figs. 5-6,8, 19, pI. 2, fig. 6.-A. AGASSIZ
and H. L. CLARK, 1907-b, p. 125.
Dicoptella agassizii LAMBERT and THIERY, 1911, p. 233.
Non Temnotrema sculpta H. L. CLARK, 1921, p. 150, pI. 17, fig. 5 (=Tem. siamense (MORTE:"SE:",
1904».
Non Dicoptella agassizii LA\lBERT and JEA2\':"ET, 1935, p. 34, pI. 1, figs. 55-59, pI. 2, figs. 1-6,
pI. 4. frgs. 3-5, 7, text-frgs. 27-39 (= Tem. maculatum (MORTENSE2\', 1904».
Locality and geological horizon.-IGPS loco no. Ch-1.-Roadside cutting west of
Jiz6d6, Makuta-mura, Kimitsu-gun, Chiba Prefecture. (tm Anegasaki, Lat. 35°21'07"N.,
Long. 140 0 06'02''E.). Jiz6d6 formation, Pleistocene. Hypotype.-IGPS colI. cat. no.
58340-A.
A fragmentary specimen at the writer's disposal, which is referred to this species.
Description of this species, including the Recent forms, is as follows.
Dimensions;
Horizontal diameter 5mm 10mm llmm 12mm 13mm 15mm
Height 3" 6" 7" 7" 8" 10"
Apical system 1.6" 2.5" 3" 3.5" 3.5" 4"
Peristome 2" 4" 5" 5" 5.5" 6.5"
Number of ambulacral 8 14 14 15 16 18
plates
Number of interambulacral 8 14 14 15 16 18
plates