568 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



in the pyloric cseca in support of the view that in Polypera we are 

 dealing with an aberrant line of development. The larger teeth in 

 Polypera greeni are simple or have the lateral lobes but faintly- 

 indicated. The nearest approach to this type of dentition found 

 among the species of Cyclogaster is in Cyclogaster major (Gill). In 

 this species some of the larger teeth are simple, but in other characters 

 the species is so widely divergent from Polypera greeni that we are 

 led to believe that the similarity in dentition is due to parallel 

 development. 



Type of the genus. — Polypera greeni ^ (Jordan and Starks) . 



CYCLOGASTER BRISTOLENSE Burke, new species. 



Liparis agassizii Gilbert, Rept. U. S. Fish Comm., 1893, 1896, p. 446. 



Ty^^e.— Female, Cat. No. 53790, U.S.N.M. Vicmity of Bristol 

 Bay, Bering Sea; Albatross station 3514. 



Distribution. — Southeastern Bering Sea, Albatross stations 3247, 

 3301, 3514, 3518; depth, 17 to 36 fathoms. 



Relationships. — The distribution, shape of body, and the presence 

 of prickles suggest a close relationship between Cyclogaster bristo- 

 lense and Cyclogaster megacephalus. The latter species, however, 

 appears to be distinct in having a larger number of dorsal rays, a 

 larger gill-slit, and the dorsal notch entirely absent. Cyclogaster 

 hristolense differs from Cyclogaster tunicatus and Cyclogaster herscheli- 

 nus in the smaller number of dorsal rays, the coloration, and the 

 presence of prickles. It differs from Cyclogaster agassizii in the 

 smaller number of dorsal rays and pyloric caeca, the coloration, the 

 presence of prickles, and the smaller giU-slit. 



Description of type. — Dorsal, 38; anal, 32; pectoral, 35. Depth, 

 4.3 in length of body; head, 3.7. Eye, 4 in head; disk, 1.8. 



Body robust, deepest at front of first dorsal. Head moderate; 

 cheeks slightly swollen; width of head a little greater than depth 

 of head; profile depressed over the eyes; occiput swollen. Mouth 

 broad; maxillary reaching vertical from pupil. Teeth trilobed, stout, 

 arranged in about 9 oblique rows in the half of each jaw. Snout 

 short, rather deep; nasal region strongly convex. Anterior nostril in 

 a short tube; posterior nostril without tube. Eye moderate; the 

 lower half silvery. GUI-slit extending down in front of the two upper 

 pectoral rays. "Thumb-tack" prickles present in aU the specimens, 

 scattered thickly over the top of the head and sparsely along the 

 sides of the body. Pyloric caeca few, not counted m the type, varying 

 from 16 to 22 in the other specimens. 



Dorsal fin with a shallow notch, the fifth and sixth rays being 

 slightly shortened. Caudal slightly rounded, connected to the dorsal 

 for two-fifths its length; the anal connection a little greater; a 

 shallow notch between caudal and dorsal, none between caudal and 



1 Froc. Cal. Acad. Sci., 1896, p. 829. 



