148 



UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Family Rhodosomatidae 



70. Corella japonica Herdman 



FiGUEE 56 



Corella japonica Herdman,, 1880, p. 472. — Herdman, 1882, p. 190, pi. 26. — Trau- 

 stedt, 1885, p. 9.— Traustedt & Weltner, 1894, p. 10.— Hartmeyer, 1906, 

 p. 25.— Tokioka, 1953a, p. 231, fig. 11 ; pi. 39, figs, 1-10. 



MATERIAL EXAMINED 



Japan : Honshu ; ofE Ose Zaki, S. 82° W., 3.3 mi. ; Albatross sta. 3714. One 

 specimen 18 mm. long (USNM 11773).— Honshu ; off Noma Saki, N. 18° E., 

 8.8 mi.; Albatross sta. 3725. Specimens 24, up to 44 mm. in length (USNM 

 11774). 



Description. — ]\Iost of the specimens from Albatross station 3725 

 are provided with typical musculature, although the number of muscles 

 varies. The test is rather cartilaginous in these specimens, and the 

 undersides hold sand grains and fine gravel, rooty protuberances are 

 practically absent. 



The specimen from station 3714 (USNM 11773) carries coarse sand 

 grains over the body surface, and has many ramified rooty protuber- 

 ances (figs. 56 «, h). The musculature consists of a small number of 

 muscles, as in those reported from Sagami Bay (Tokioka, 1953a). 







Figure 56. — Corella japonica Herdman: a, the 18 mm. individual from sta. 3714, encrusted 

 with coarse sand grains and with many ramified rooty protuberances; b, the other 18 

 mm. individual from same station, nearly exposed, but partly covered with mud and 

 fine sand. 



