Bissell's Whitefish 



ing; middle of upper lip on a level with middle of pupil; 

 maxillary long, moderately broad, reaching anterior edge of pupil, 

 the width about 3 in its length; supplemental maxillary bone well 

 developed, nearly half length of maxillary, its width 2-f in its length ; 

 mandible long, reaching posterior edge of pupil; distance from 

 tip of snout to occiput half that from occiput to origin of dorsal 

 fin, which is midway between tip of snout and base of caudal 

 fin; caudal peduncle short, compressed and deep, its least depth 

 about 2\ in head; fins all rather large; height of dorsal \\ in head, 

 its base if in its longest ray; anal base very oblique, equal to 

 longest ray, which is about equal to base of dorsal fin ; pectorals 

 and ventrals long, almost equal to longest dorsal ray; scales firm, 

 considerably enlarged anteriorly; free margins of the scales less 

 convex than in other species, often emarginate, especially on 

 anterior part of body; lateral line straight and in a line with 

 upper rim of orbit; tongue with a patch of fine teeth near the 

 tip ; gillrakers numerous, long and slender. Colour, iridescent 

 bluish above, sides and under parts silvery; older individuals 

 darker above, and with more golden reflections on sides; fins 

 all more or less evidently black-tipped; upper edge of pectoral 

 margined with black. From all other whitefishes the tullibee is 

 easily distinguished by the short, deep body and the closely 

 imbricated scales whose margins are scarcely convex or even 

 emarginate. 



Bissell's Whitefish 



Argyrosomns bisselli (Bollman) 



In Rawson and Howard lakes, Michigan, and perhaps in other 

 small lakes of that state, is found a whitefish closely related to 

 the tullibee and possibly intergrading with it; the maxillary seems, 

 however, to be somewhat longer, the scales are smaller, the lower 

 jaw longer, and the supraorbital bone elongate pear-shaped. 



Nothing has been recorded as to the habits, size or abundance 

 of this fish. 



Inconnu 



Stenodus mackensii (Richardson) 



The inconnu is a large, coarse salmonid inhabiting the 

 larger streams of Alaska and northwestern British America. It 

 is known from the Yukon and Mackenzie rivers, and the tribu- 

 taries of the latter below the cascades; locally abundant and 

 reaching a large size, usually 5 to 15 pounds, but sometimes 30 



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