364 



MEMOIRS OF THE CARNEGIE MUSEUM 



Type, 43 mm. Amatuk. (Carnegie Museum Catalog of Fishes No. 1053). 



Cotypes, five specimens, 39-50 mm. Amatuk. (C. M. Cat. No. 1054; 

 I. U. Cat, No. 11744.) 



Cotypes, three specimens, 31-35 mm. Waratuk. (C. M. Cat. No. 1055; 

 I. U. Cat. No. 11745.) 



Two specimens, 35-43 mm. Erukin. (C. M. Cat. No. 2455a-6.) 



This species was taken by using poison in a little side branch of the Waratuk 

 Cataract, and in the same way in a larger branch of the Amatuk Cataract. 



Head 3.8-4; depth 3.2-3.5; D. 9 or 10; A. 24 or 25 (rarely 27); scales 6-37 to 

 40-4. Eye 2.5; interorbital equal to eye. 



Elongate, little compressed, heavy at shoulder; dorsal and ventral profiles 

 equally arched, without hump or depressions; preventral area narrowly rounded, 

 with a median series of scales; postventral area compressed to a narrow edge; 

 predorsal area keeled, with a median series of about thirteen scales. 



Occipital process about one-fifth of the distance from its base to the dorsal, 

 bordered by three scales; head narrow, smooth above, slightly convex; frontal 

 fontanel much shorter than the parietal, narrow; second suborbital leaving a naked 

 area about one-third as wide as its own greatest width; maxillary longer than snout, 

 but not quite equal to eye; premaxillary with three three-pointed teeth in the front 

 row and five three- to five-pointed ones in the second; denticles of the second row 

 in a more or less open crescent; four or five maxillary teeth similar to those of the 

 inner row of the premaxillary. Mandible with seven graduated multicuspid 

 incisors, followed by one or two conical incisors. 



Gill-rakers 6 + 12. 



Origin of dorsal a little nearer snout than to caudal, its penultimate ray a little 

 more than half as long as the longest ray, which is about one-fourth of the length. 

 Margin of anal straight, the rays graduate from the anterior longer ones; ventrals 

 very short, not reaching anal, a little nearer to the snout than the dorsal; pectorals 

 reaching ventrals. 



Markings in formalin specimens: each pore of the lateral line surrounded by 

 black, the dots forming a conspicuous line; bases of two rows of scales below the 

 lateral line over the abdomen and three or four rows of scales above the lateral line 

 dark, the spots forming fainter longitudinal lines; margins of scales of the upper 

 parts of the sides and the entire dorsal line very dark ; a faint comma-shaped vertical 

 humeral spot interrupted in the middle; a dark lateral band intensified in spots and 

 ending in a caudal spot, which extends from a little above the lateral line to the 

 lower margin of the caudal; ventral fins dusky. 



