158 HAWAIIAN AND OTHER PACIFIC ECHINI. 



Phormosoma bursarium A. Ag. 



Phormosoma bursarium A. Agassiz, 1881. " Challenger " Ech., p. 99 ; PI. Xb. 

 East Indies ; off Japan ; Hawaiian Islands ; 165-1050 fathoms. 



Plates 62, fig. 2; 63, fig. 3. 



This is the Pacific representative of placenta, and very near it in all 

 essential characters. The difference in tuberculation of the test abacti- 

 nally seems to be fairly constant, but certain specimens of the two forms 

 appi-oach each other very nearly. The color of bursarium appears to be quite 

 uniformly yellow-brown, though the shade varies a great deal ; some speci- 

 mens are very dark, while others are bleached almost white ; one of the 

 latter is very decidedly pink on the actinal surface. This species was taken 

 by the " Albatross " at the following stations, the specimens ranging from 

 20 to 110 mm. in diameter : 



Station 3884. Between Maui and Molokai, Hawaiian Islands. Bott. 

 temp. 44°. 284-290 fathoms. Glob. m. 



Station 3892. Off north coast of Molokai, H. I. Bott. temp. 42.5°. 

 328-414 fathoms. Fne. gy. s. 



Station 3904. Off north coast of Molokai, H. I. Bott. temp. 43.9°. 

 295 fathoms. Br. m., s., r. 



Station 3957. Vicinity of Laysan Island, H. I. Bott. temp. 53.5°. 173- 

 220 fathoms. Fne. wh. s. 



Station 3988. Off Hanamaulu, Kauai, H. I. Bott. temp. 40°. 165-469 

 fathoms. Gy. for. s., p. 



Station 3994. Off Mokuaeae Islet, Kauai, H. I. Bott. temp. 42.9°. 

 330-382 fathoms. Fne. gy. s., for. 



Station 3997. Off Ukula Point, Kauai, H. I. Bott. temp. 41°. 418-429 

 fathoms. Fne. gy. s., br. m. 



Station 4019. Off Hanamaulu, Kauai, H. I. Bott. temp. 37.8°. 409- 

 550 fathoms. Gy. s., for., r. 



Station 4022. Off Hanamaulu, Kauai, H. I. Bott. temp. 41.° 374-399 

 fathoms. Co., s., for., r. 



Station 4025. Off Mokuaeae Point, Kauai, H. I. Bott. temp. 44.9°. 

 275-368 fathoms. Fne. gy. s., brk. sh., for. 



Station 4087. Off Mokuhooniki Islet, Pailolo Channel, H. I. Bott. temp. 

 43.6°. 306-308 fathoms. Fne. gy. s. 



