364 PROCEEDINGS OF THE ACADEMY OF [May, 



than length of longest filaments. Filaments long, equal to orbit. 

 Pseud obranchise about equal to gill-rakers. Isthmus broadly tri- 

 angular. Branchiostegals 8. 



Scales cycloid, mostly of even size, and in parallel longitudinal 

 series. Head and fins scaleless, except base of caudal, where scales 

 are small and crowded. Small scales on base of adipose fin, outer 

 or free portion scaleless. Lateral line median, continuous and nearly 

 straight to base of caudal. Tubes simple. 



Dorsal inserted well forward, its origin much nearer tip of snout 

 than base of caudal, first branched rays longest and others graduated 

 down. Adipose dorsal over anal, its origin nearly midway between 

 that of dorsal and tip of upper caudal lobe (damaged), and height 

 of fin about ^ in length of its base. Anal similar to dorsal, its origin 

 a little nearer base of caudal than origin of ventral, first branched 

 ray highest and others graduated down. Caudal deeply emarginate, 

 lobes distinct and evidently pointed. Rudimentary caudal rays 

 well developed. Pectoral low, small, lobate, and reaching about half 

 way to ventral. Ventral inserted about opposite base of second 

 dorsal ray, first branched ray longest and when depressed fin reaches 

 half way to anal. Vent close before origin of anal. 



Color in alcohol plain brown, back with a rather olivaceous cast 

 and each scale at its junction with one below a little darker than 

 general body color so that many longitudinal bands are formed, 

 most pronounced or distinct on back and upper sides. Fins plain 

 brownish, dorsal and caudal dusky. Iris slaty. 



Length 16 inches. 



In all, three examples from Point Barrow. The one described 

 above is the only one with a well-developed hump. The hump can- 

 not always be considered a character of the adult male, as the exam- 

 ple described is but two inches longer than another example without 

 the hump, which is also a male. This I have figured. Both have 

 the milt little developed. The small male also shows the depth about 

 4^. A female, but little smaller than the male, agrees with the 

 hump-back male in depth, but this is due to the deeper abdomen as 

 thepredorsal region is not especially gibbous. The comparisons, etc., 

 of these three examples will now be seen as follows : Head 4f to 5^ ; 

 depth 3f to 4i; D. iv, 10, i to iv, 11, i; A. iv, 11, i to iv, 12, i; scales 

 73 to 79 in lateral line to base of caudal and usually 4 more on latter; 

 rakers 8 + 13 to 8 + 15, usually 14 on lower part of first arch; total 

 length of body (caudal damaged) 14 to 16 inches. 



This species attains some size. The type, figured by Mr. Nelson, 



