242 



BULLETIN 15, UNITED STATES NATIONAL MUSEUM. 



Localities. — Albatross station 4803, off Simushir Island, lat. 46° 42' 

 N. ; long. 151° 45' E., 229 fathoms, coarse pebbles, black sand, bottom 

 temperature 35.9°, 1 specimen; station 4804, off Simushir Island, lat. 

 46° 42' N. ; long. 151° 47' E., 229 fathoms, coarse pebbles, black sand, 

 bottom temperature 35.9°, 3 specimens. 



Type.— Cat. No. 25592, U.S.N.M., from station 4804. 



This species is in its proportions much like vestitus, but it is not very 

 near that species. The disk spinules, the arm spines, and the jaws 

 furnish its most distinctive features. 



OPHIOLEBES PACHYBACTRA, new species.a 



Disk 11 mm. in diameter; arms about 35 mm. long, probably. 

 Disk covered with coarse scales, many of which bear stout club- 



FlG. UG.— OPHIOLEBES PACHYBACTRA. X 1.5. Q, FROM ABOVE; b, FROM BELOW; C, SIDE VIEW OF TWO 



ARM JOINTS NEAR DISK. 



shaped spines, which are much thicker at the tip than at the base. 

 Radial shields moderate, roughly triangular, in contact distally but 

 widely separated within. Upper arm plates triangular or rhombic, 

 much wider than long, well separated from each other. Interbrachial 

 spaces below covered by scales somewhat smaller than those of disk. 

 Genital slits very large. Oral shields small, rounded rhombic, 



o-Uaxug, signifying thick, and ^iuczpov, signifying club, in reference to the very 

 thick, club-like lower arm spines. 



