112 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



apex of jaw. Genital slits remarkably long and conspicuous, reach- 

 ing from middle of oral shield to fourth joint of arm. First under 

 arm plate very small, hexagonal, about as long as wide; next 

 two or three plates somewhat pentagonal, wider than long; suc- 

 ceeding plates small, pentagonal or triangular, becoming minute, 

 diamond-shaped. Side arm plates moderate, little swollen, meeting 

 broadly below, and above except at base of arm. Each plate car- 

 ries three small, blunt spines, close together, low down on the plate, 

 but on the basal joints there may be only two, one, or none. 

 Tentacle pores on second, third, and fourth joints of arm small, 

 protected usually by one, rarely by two, scales. Color (dried from 

 alcohol), pale yellowish, or light brown. 



Localities. Albatross station 3104, off California, lat. 37 23' N.; 

 long. 123 8' W., 391 fathoms, clay, bottom temperature 40.8, 1 



FIG. 41. OPHIOMUSIUM JOLLIENSIS. X2.5. a, FROM ABOVE; 6, FROM BELOW; c, SIDE VIEW OF THREE 



ARM JOINTS NEAR DISK. 



specimen; station 3126, off California, lat. 36 49' 20" N.; long. 

 122 12' 30" W., 456 fathoms, green mud, bottom temperature? 

 (42.8), 145 specimens; station 3347, off Washington, lat. 45 9' 35" 

 N.; long. 124 45' W., 345 fathoms, mud, bottom temperature 40.9, 

 21 specimens; station 3738, off Port Heda, Japan, 167 fathoms, 

 stiff blue mud, 3 specimens; station 4965, off eastern Japan, lat. 

 33 35' 20" N.; long. 135 10' 50" E., 191 fathoms, dark green- 

 gray sand, shells, bottom temperature 49.4, 11 specimens; station 

 5079, off eastern Japan, lat. 34 15' N.; long. 138 E., 475 to 505 

 fathoms, pebbles, bottom temperature 39.1, 1 specimen; station 

 5091, Uraga Strait, Japan, lat. 35 4' 10" N.; long. 139 38' 12" E., 

 197 fathoms, green mud, coarse black sand, pebbles, bottom tem- 

 perature 47.6, 11 specimens. Locality?, 1 specimen. Bathymet- 

 rical range, 167 to 505 fathoms. Temperature range, 49.4 to 39.1. 

 One hundred and ninety-four specimens. 



Although this species is closely allied to cancellatum, armigerum, 

 and eburneum, it may be at once distinguished from any of these 

 species by the combination of long genital slits with the very 



