76 
koyama); V erticordia japonica A. Ad.; Emargi- 
nula incisura A. Ad.; Bursa ranelloides ( Rve. ) , 
var.; Distorsio sp. 
3. W at arinose Bank 
material: Dredged by the R.Y. "Soyo-maru” 
on Nov. 20, 1955, at 2 stations from depths of 
80-100 m and 140-220 m. 
earlier works: None. 
SPECIES IN THE PRESENT MATERIAL: A car 
congenitum (Smith); Barbatia tamikoae Saha- 
ra! (ms); Saniacar pacifica (Nomura and 
Zimbo); Tucetona shinkurosensis Hatai, Niino 
and Kotaka; Malleus irregularis ( Jousseaume) , 
var.; Chlamys mo Hit a (Rve.); C. lemniscata 
(Rve.); Lima fujitai Oyama; Astraea okamotoi 
Kuroda and Habe; Galeoastraea guttata (A, 
Ad.) ; Casmaria cervica (Sowerby) ?; Tenagodus 
anguinus ( L. ) ; Clavus sp. aff. rufovaricosa Ku- 
roda (MS). 
4 . Toshimatai Bank and Niijima Niskitai Bank 
(T oramaguri) 
MATERIAL: None is available for the present 
study except Gians sagamiensis Kuroda and 
Habe and Conus kinoskitai Kuroda from Nii- 
jima-Nishitai. 
earlier works: Niino (1955) reported 19 
pelecypods and 4 gastropods from Toramaguri 
and a single gastropod from Toshimatai. Shirai 
(1958) reported 9 bivalves and 4 univalves 
from Niijima-Nishitai Bank. 
SPECIES REPORTED BY NIINO AND SHIRAI: 
Toshimatai Bank— Tucetona shinkurosensis Ha- 
tai, Niino and Kotaka; Hiatella arctica orientalis 
Yokoyama; Perotrochus beyrichii (Hilgendorf), 
88 m. 
Niijima-Nishitai Bank— -Bar batia plicata 
(Dillwyn) (probably A. congenitum ), 120 m; 
Tucetona shinkurosensis Hatai, Niino and Ko- 
taka, 104 rn; Chlamys pelseneeri Dautzenberg 
and Bavay, 120 m; C. vesiculosus Dkr., 78 m; 
Lima zushiensis Yokoyama, 73 m; Lima fujitai 
Oyama, 104 m; Limatula japonica A. Ad., 104 
rn; Cr as satellites oblongatus (Yokoyama), 120 
m; Venus toreuma Gould, 78 m; Aloides venusta 
(Gould), 120 m; Perotrochus beyrichii (Hil- 
gendorf), 104, 120 m; Emarginula fragilis Yo- 
PAGIFIC SCIENCE, Vol. XVII, January 1963 
koyama, 104 m; E. sp., 104 m; Punctmella fasti - 
giata A. Ad., 78 m; Trivirostra oryza (Lamarck), 
88 m. 
X Ombase Islet ( near Kozu Island) 
MATERIAL: A part of the specimens dredged 
by the R.V. "Tonan-maru” at depths of 32, 55, 
60, and 100 m. These were examined by cour- 
tesy of Mr. Kurata. 
EARLIER WORKS: Igarashi and others (1956) ■ 
reported on the bottom character and upon pis- 
cifauna from the viewpoint of fishing ground 
investigation. 
SPECIES IN THE PRESENT MATERIAL: SdMacar 
pacifica (Nomura and Zimbo), 60" m; Barbatia 
sp.; Tucetona shinkurosensis Hatai, Niino and 
Kotaka, 32 m; Glycy metis amamiensis Kuroda, 
32 m; Venus toreuma Gould; Galeoastraea gut- 
tata (A. Ad.), 55, 100 m. 
6. Kurose and Shinkurose 
MATERIAL: Collected from Kurose Bank at a 
depth of ca. 200 m by Cor allium fishing net of 
the R.V. "Tonan-maru.” Examined by courtesy 
of Mr. Kurata. 
EARLIER WORKS: Niino (1952) surveyed 
around Shinkurose Bank and reported 13 gas- 
tropods, 20- pelecypods including 3 new forms, 
and 1 scaphopod. 
SPECIES IN THE PRESENT MATERIAL: KufOSC 
Bank- - -A car congenitum (Smith); Area mania 
takii Hatai, Niino and Kotaka; Barbatia sp.; 
Samacar pacifica (Nomura and Zimbo); Lima 
fujitai Oyama; L. quanto ensis Yokoyama; Cras- 
satellites oblongata Yokoyama; Perotrochus bey- 
richii (Hilgendorf); Emarginula sp.; Tenagodus 
anguinus ( L. ) ; Bursa ranelloides (Rve.) var.; 
Chicoreus laciniatus (Sowerby); Conus sp. 
Shinkurose (Niino)— Area sp., 290 m; Nip- 
ponolimopsis nipponica (Yokoyama), 290 m; 
Tucetona hanzawai (Nomura and Zimbo), 280 
m; Tucetona shinkurosensis Hatai, Niino and 
Kotaka, 290 m; Venericardia ryukyuensis No- 
mura and Zimbo, 290 m; V asticardium sp., 280 
m; Chione chlorotica , 280 m; Cadulus sp., 290 
m; Collisella heroldi (Dkr.), 290 m (a littoral 
species, may be carried down to the deep by some 
means); Margarites cincereus (Couthouy), 290 
