SALMONID^. — CV. 275 



except at the spawnins: season ; very close to the preced- 

 ing, of which it is probably a variety, but the habits are 

 more like those of the next. 



2. C. nigripinnis, (Gill) Jor. Black Fin. Head 4^ in 

 length; depth the same; eye 4 in head; body compressed; 

 fins blackish, darker than in the others; D. 12; A. 12; 

 lat. 1. 80; length IG to 18 inches; a much larger lish 

 than the preceding. Lake Michigan, in deep water. 



** Body elevated ; depth about 3 in length. 



3. C. tullibee, Rich. Tullibee. Head 4^ in length ; 

 D. 15; A. 15; lat. 1. 77. L. Superior and N. 



§ Upper jaw projecting beyond the lower; "White Fish." {Gore- 

 gonus.) 



4. C hoyl, (Gill) Jor. Cisco of Lake Michigan. 

 Head 4 in length; depth 4|-; eye large, 3f in head; max 

 illary 2f ; mandible 2; longest ray of dorsal four times the 

 length of the shortest; upper jaw somewhat projecting, 

 the mouth appearing much as in Corego7iiiSy bluish 

 above, sides lustrous silvery, more brilliant than in any 

 other species; D. 11; A. 12; lat. 1. 74; length 8 inches. 

 Smallest and handsomest of the Ciscoes, in the deep 

 waters of the Upper Lakes. 



D. C. c/upei form is, {Mitch.) Lake White Fish. Depth 

 3^ in length; head small, 5^; eye 4 in head, about as 

 long as snout; form varying much with age, sex and 

 food; the back generally elevated, and the sides com- 

 pressed; pale olive above; sides white; D. 13; A. 13; 

 lat. 1. 75 to 8G. Great Lakes and bodies of water tribu- 

 tary to them, north to the Arctic Sea. (This species 

 seems to be Mitchill's Sahno chipeifofmis.^ and the latter 

 specific name will perhaps have to supersede albus.) 

 {C. saj^idissiinus, latior^ richardsoni^ etc., of authors.) 



