862 ABDBNDA. 



** Body elongate, subfusiform, less compressed j dorsal and ven- 

 tral outlmes dissimilar ; scales smaller, loose and uniform, 

 posteriorly more convex. (Ai-gyrosomus.} 



2. A. nigripinnis. Gill. Black Fin. Blue Fist. (See 

 text.) 



3. A. artedi, (Le Sueur) Hoy. Common Lake Hek- 

 EiNG. (See text.) 



4. A. hoyi. Gill. Cisco of Lake Michigan. (See text.) 



~ 2. COREGONUS, Linnaeus. White Fishes. 



* Body elongate ; tongue with evident teeth. 



1. C. labradorious, Richardson. Lake Whiting. 

 Black Cisco. Body elongate, compressed, the depth 

 4^ in length; head long and slender, somevyhat pointed, 

 4f in length; mouth moderate, reaching front of pupil; 

 dorsal high in front, 2, 11; A. 3, 11; lat. 1, 80—84; about 

 eight rows above and seven below; fins all blackish; 

 color rather dark bluish, sides silvery. Lakes from 

 Northern N. Y. to New Hampshire and Labrador. (C. 

 neohantoniensis, Prescott.) 



** Body stout, becoming deep and elevated with age ; no teeth. 



3. C. clupeiformis, (Mitchill) Milner. Common White 

 Fish. (See text, C. albus.) {O. otsego, Clinton.) 



3. PROSOPIUH, Milner. Round White Fish. 



1. P. quadrilaterale, (Rich.) Milner. Menomonee 

 White Fish. (See text.) The Shad- waiter (C. wo«a»' 

 glioB, Prescott) of the lakes of N. N. Y. and N. H., 

 is apparently identical with this species. 



2. P. couesii, Milner. Chief Mountain White Fish. 



(See text.) (For further Aadenda, see page 403.) 



