80 
PACIFIC SCIENCE, Vol. XVII, January 1963 
N 
36 ° 
34° 
i 
Fig. 7. Distribution of three species of Japanese Perotrochus. Dots, P. beyrichii; horizontal lines, P. hirasei; 
cross lines, P. salmi ana. 
western waters off Kyushu and around the Goto 
Islands, where some banks-associated assem- 
blages are found (Sakurai, 1959, and cf 11). 
Perotrochus salmiana (Rolle) (Fig. 6) is also 
known from waters off Kii and Tosa provinces. 
In the present survey, a new locality for this rare 
species was discovered from the Uji Islets 
CSoyo” sta. 72a, Feb. 8, 1959, 31° 24.7' N, 
129° 37.6' E, 126 m), in company with the 
similar banks-associated fauna (cf 10). The 
smallness of the specimen in the present ma- 
terial may coincide with the fact pointed out 
by Parker and Curray (1956: 2436), . . 
most of these bank forms were considerably 
smaller, although they appeared to be mature 
specimens. . . .” 
13. Galeoastraea guttata (A. Adams) 
Fig. 8 
According to Habe (1958), this fascinating 
species is distributed around Boso Peninsula 
and Sagami Bay. As is shown in the map (Fig. 
20 a), this species is characteristically distrib- 
uted on the banks around the Izu Islands, i. e., 
Hyotanse, Ombase Islet, and Okinoyama. It is 
very rare from the insular shelf, despite the 
fact that there is an example from the Izu Penin- 
FlG. 8. Galeoastraea guttata (A. Adams) from 
Hyotanse, 153 m, 22.2 mm X 30.3 mm. 
