140 



University of Washington Publications in Biology 



[Vol. 2. 



Fig. 34. Rocky Mountain Whitefish. Pro- 

 sopium williamsoni. After Schultz and Han- 

 son. Courtesy of the Washington Sportsman. 



4b. The base of the adipose fin is contained from .75 to 1 times in anal 

 fin base; total length of adipose fin in head 1.3 to 1.6. Range: Co- 

 lumbia River and tributaries. Freshwater. Common in Columbia 

 River. 

 Oregon Whitefish. . .48. Prosopium orcgonium (Jordan and Snyder) 



Family 22. Thymallidae. Grayling 



Range : Rocky Mountain region of northern United States and of south- 

 ern Canada. Freshwater. Locally abundant. Fig. 35. 

 Montana Grayling 49. Thymallus montanus Milner 



Fig. 35. Montana Grayling. Thymallus 

 montanus. After Schultz and Hanson. Cour- 

 tesy of the Washington Sportsman. 



Family 23. Osmeridae. Smelts 4 



la. Scales of moderate size (fewer than 80 in the lateral line) ; scales on 

 sides not forming villous bands in the breeding male although they may be 

 enlarged and edematous. 



2a. Teeth on the vomer canine-like, few in number, and not covering the 

 whole head of the bone. Fig. 18. 



3a. Vomerine teeth confined to lateral tips of U shaped vomer, fang-like, 

 1 to 3 in number on each side, very strong, not deciduous at spawning ; 

 pelvic fins inserted distinctly behind origin of dorsal ; gill rakers in 

 moderate number, 8 to 10+19 to 23 on first arch; scales 66 to 69 in 

 lateral line ; anal fin low, its height contained 2.6 to 3.3 times in head ; 

 upper jaw about reaching vertical from posterior margin of eye; spawn- 

 ing in streams. Range : Northern China to Alaska. Marine. Abundant. 

 Rainbow "Herring" 50. Osmerus dentex Steindacliner 



'Modified after Hubbs 1926, Proc. Biol. Soc. Wash. 



