294 Field Museum of Natural History - — Zoology, Vol. VII. 



Fig. 54- Steelhead; Salmon Trout. 



Salmo gairdneri Richardson. (After Goode.) 



A Pacific Coast fish introduced into the Great Lakes ; occasionally 

 taken at Pine and Millers. Indiana. 



Genus Cristivoiner Gill & Jordan. 



Lake Trout. 



Body moderately elongate; mouth large, hyoid with a band of 

 strong teeth; jaws with teeth; vomer boat-shaped, with a raised 

 crest behind its head and free from its shaft; crest of vomer with 

 teeth; scales small. 



Cristi vomer namaycush (Walbaum).LAKE Trout;Mackinaw Trout. 



Head 3.8 to 4.2; depth 4 to 5.2; D. 11; A. 11; scales 185 to 210. 



Body elongate, head large, its upper surface flattened; interorbital 

 space 3.2 to 3.9 in head; snout 3.2 to 3.5; mouth large, the maxillary 

 reaching beyond eye; its length about half that of head; teeth very 

 strong; lateral line complete. 



Color grayish green to brownish, to almost black; sides with 

 round pale spots; head usually vermiculate above; dorsal and caudal 

 reticulated with darker, the anal faintly so. 



Length 3 feet. 



This fish inhabits the colder lakes and streams of North America 

 from Alaska, Northern Illinois to Maine and northward. 



Lake Michigan, Millers, Indiana; Lake Michigan, Pine, Indiana. 



