SALMONID^E. CV. 275 



except at the spawning 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 16 to 18 inches; a much larger fish 

 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. hoyi, (Gill) Jor. Cisco OF LAKE MICHIGAN. 

 Head 4 in length; depth 4-J; 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 Goregonusj 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. 



5. C. clupeiformis, (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 86. Great Lakes and bodies of water tribu- 

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

 seems to be Mitchill's Salmo clupeiformis, and the latter 

 specific name will perhaps have to supersede albus.) 

 (C. sapidissimus, latior, richardsonii^ etc., of authors.) 



