GENUS CRIST I1SOMER GILL & JORDAN 

 The Great Lakes Trouts 



This genus contains only 2 species, large, coarse charrs, 

 distinguished from Salve! inns by the presence of a raised crest 

 behind the head of the vomer and free from its shaft. This crest 

 is armed with teeth, and the hyoid teeth form a strong, cardiform 

 band. 



The typical species is a large charr or trout, spotted with 

 gray instead of red, and found in the larger lakes of northern 

 North America. 



a. Body elongate, covered with thin skin, there being no special 

 development of the fatty tissue; namaycush, 203 



aa. Body deeper, covered with thick skin, there being an excessive 

 development of fatty tissue ; siscowet, 205 



Great Lakes Trout; Mackinaw Trout 

 Cristivomer namaycush (Walbaum) 



The namaycush trout is found in most large lakes from New 

 Brunswick and .Maine westward throughout the Great Lakes region 

 and to Vancouver Island thence northward to Northern Alaska, 

 Hudson Bay and Labrador. It is known from Henry Lake in Idaho 

 and elsewhere in the headwaters of the Columbia. It is known also 

 from the Fraser River basin, from Vancouver Island, and various 

 places in Alaska. 



203 



