108 BULLETIN 150, UNITED STATES NATIONAL MUSEUM 



mentary longifilis. 



Q.2 Gill slit extending down in front of the 

 pectoral fin. 

 f ^ Disk well developed, not over 4 in the head. 



gi. Body deep; depth not over 4 in the length; vent near the 



disk ovigerum. 



g2. Body depressed, elongate; depth about 6; vent far back from 



the disk opisthotremus. 



f 2, Disk small, 6 or more in the head. 



h'. Gill slit in front of not more than 6 pectoral rays. 

 i^ Peritoneum silvery, undotted. 



ji. Eye 3.4; dorsal, 55; anal, 49; pectoral, 33-35; no prickles, 



pellucidus. 

 j2. Eye 4.6; dorsal, 59; anal, 52; pectoral, 34-37; cactuslike 



prickles present rastrinus. 



12. Peritoneum silvery, dotted; dorsal 58; anal 53; pectoral 



31-32; cactuslike prickles present trachysoma. 



h^. Gill slit in front of 10 or more rays. 



k^ Disk small, 7 to 9 in the head gilberti. 



k*. Disk minute, more than 9 in the head ostentum. 



P2. Teeth slender, lanceolate, recurved; the 



cutting surface appearing horizontal 



when the jaws are opened, outer teeth 



appearing little shorter than the inner 



teeth; peritoneum black except in 



entargyreus. 



V. Body deep; depth less than 5 in the length; lips 



pale; lower lobe of the pectoral about 2 in the 



head, not reaching beyond the vent.roseofuscus. 



P. Body not so deep; depth more than 5 in specimens 



less than 120 mm. in length; lower lobe of the 



pectoral distinctly less than 2 in the head, 



reaching past the vent. 



m*. Prickles absent; lips dark or black; lower lobe 



of the pectoral about equal to the head, 



usually reaching midway between vent and 



anal fin coUetti, 



m2. Thumb-tack prickles present; lower lobe of the 

 pectoral about 1.5 in the head, reaching 

 little past the vent, 

 n*. Peritoneum black; pupil moderate; depth 



144-428 fathoms entomelas. 



n^. Peritoneum pale, dotted; pupil minute; depth 

 35-66 fathoms entargyreus. 



CAREPROCTUS PYCNOSOMA Gilbert and Burke 



Careproctus pycnosoma Gilbert and Burke 19126, p. 372. 



Type.— No. 73340, U.S.N.M.; Albatross Station 4803, off Cape 

 Rollin, Simushir Island, Japan; depth 229 fathoms. Length 46 mm. 



Distribution. — Off Simushir Island, Japan, Albatross Station 

 4803; depth 229 fathoms. Type specimen examined. 



Relationslhips . — In the character of the anterior dorsal rays and 

 the firm body C. pycnosoma appears to be the least modified of any 



