NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 75 



margin. Oral tentacle pores do not open distinctly into mouth slit; 

 they are protected by two or three scales on each side. Tentacle 

 pores of arm with three or two scales, and at last only a single scale, 

 on proximal margin. Color (dried from alcohol), nearly white. 



Localities. Albatross station 4812, Sea of Japan, lat. 38 33' N.; 

 long. 138 40' E., 176 to 200 fathoms, fine brown mud (?), bottom 

 temperature 34.9, 6 specimens; station 4819, Sea of Japan, lat. 38_9' 

 N.; long. 138 32' 12" E., 245 fathoms, fine brown mud, bottom 

 temperature 33.1, 4 specimens. Bathymetrical range, 176 to 245 

 fathoms. Temperature range, 34.9 to 33.1. Ten specimens. 



Type.C&t. No. 25618, U.S.N.M., from station 4812. 



Although this interesting little brittle-star is nearly related to both 

 Ophiura bullata and 0. convexa, it is easily distinguished from either 

 (even young specimens) by the single short, blunt arm spine, the 

 wide oral shields, and the large tentacle scales. It is quite possible 

 that adiplax is the young of a larger species, but I know of none to 

 which it can be assigned, and it seems to me therefore desirable to 

 both name and figure it. 



OPHIURA STEREA. 



Ophioglypha sterea H. L. CLARK, Bull. Mus. Comp. ZooL, vol. 51, 1908, p. 293. 



Localities. Albatross station 3771, off Honshu Island, Japan, 6>1 

 fathoms, green mud, sand, 40 specimens; station 3774, off Honshu 

 Island, Japan, 81 fathoms, gray sand, 2 specimens; station 3775, off 

 Honshu Island, Japan, 57 fathoms, green mud, sand, 2 specimens; 

 station 4815, Sea of Japan, lat. ,38 16' N.; long. 138 52' W., 70 

 fathoms, dark green sand, bottom temperature 51, 1 specimen; 

 station 4826, off Honshu Island, Japan, lat. 37 25' N.; long. 137 32' 

 E., 114 fathoms, fine gray sand, black specks, bottom temperature 

 42.5, 2 specimens; station 4832, off Honshu Island, Japan, lat. 36 

 14' 30" N.; long. 135 56' 30" E., 76 to 79 fathoms, dark gray sand, 

 bottom temperature 53.2, 14 specimens; station 4833, off Honshu 

 Island, Japan, lat. 36 13' 40" N.; long. 135 56' 30" E., 79 fathoms, 

 dark gray sand, rocks, bottom temperature 53.2, 6 specimens; station 

 4842, off Korea, lat. 36 13' N.; long. 133 27' E., 82 fathoms, fine 

 green sand, shells, bottom temperature 54.6, 1 specimen; station 

 4965, off Japan, lat. 33 35' 20" N.; long. 135 10' 50" E., 191 

 fathoms, dark green-gray sand, shells, bottom temperature 49.4, 

 1 specimen; station 5046, off Honshu Island, Japan, lat. 38 15' 7" 

 N.; long. 141 44' 20" E., 82 fathoms, dark gray sand, pebbles, bot- 

 tom temperature 50.8, 20 specimens; station 5055, in Suruga Gulf, 

 Japan, lat. 34 53' N.; long. 138 44' 15", 124 fathoms, green mud, 

 gray sand, broken shells, pebbles, bottom temperature 56.6, 6 speci- 

 mens; station 5092, Uraga Strait, Japan, lat. 35 4'50"N.; long. 

 139 38' 13" E., 70 fathoms, coarse black sand, bottom temperature 



