188 BULLETIN 150, UNITED STATES NATIONAL MUSEUM 



Teeth in narrow bands, elongate, slender, slightly recurved, simple or 

 the lateral lobes faintly indicated on some of the teeth. Snout 

 depressed, broad, projecting as in R. harhulijer, extending beyond the 

 upper lip for three-fourths the diameter of the eye. The snout is 

 somewhat mutilated but at least three barbels are present on each 

 side; one of these is situated near the tip of the snout and two near the 

 lateral margin of the lower surface. Nostril with a raised rim. Eye 

 large, 4 in the head. Gill slit apparently above the base of the pec- 

 toral fin. Pyloric coeca about 12. One suprabranchial pore. 



Caudal fin mutilated but apparently reduced to a single elongate 

 ray, connected for a short distance with the dorsal and anal fins. 

 Pectoral fin with a shallow notch; the middle rays well developed, 

 widely spaced; the lower lobe of six elongate mainly free rays; the 

 upper lobe of 16 rays. 



The dermis absent, probably dusky or blackish; flesh pinkish; 

 mouth dusky; peritoneum black; stomach pale or slightly dusky. 



Genus ACANTHOLIPARIS Gilbert and Burke 



Acantholiparis Gilbert and Burke, 1912a, p. S3. 



Disk absent; nostril single; teeth simple; one suprabranchial pore; 

 pyloric coeac absent; pseudobranchiae absent; opercular arms pro- 





Figure 104.— Acantholiparis opercularis. Type, showing opercular spines found in no 

 other specils of the family 



jecting as strong spines from sides of head; gill flap supported by the 

 posterior arm of the suboperculum; branchiostegal rays 6. 

 Genotype. — Acantholiparis opercularis. 



ACANTHOLIPARIS OPERCULARIS Gilbert and Burke 



Acantholiparis Gilbert and Burke, 1912a, p. 83. 



Type.~No. 74390, U.S.N.M.; Albatross Station 4797, off Starit- 

 schkof Island, Kamchatka; depth 682 fathoms. Length 76 mm. 



Distribution. — North Pacific, Albatross Stations 4761 and 4797; 

 depth 682 to 1,973 fathoms. 



Description of the type. — Dorsal 45; anal 39; pectoral 26; caudal 10; 

 pyloric coeca absent. Depth 7; head 4.6. Eye 4.8; snout 3. 



Head and body as in C. ectenes; body slender, depressed. Head 

 broad, depressed, flat. Snout low, wide, projecting over the broad 

 mouth. Mouth broad; maxillary reaching below the posterior mar- 

 gin of the pupil. Teeth fine, conical, in moderate bands, the tip 



