320 -I \ 1 NTH KKl'ORT OF THE FOREST, FISH AND GAME COMMISSION. 



one-half in snout, one and one-third in intcrorbital space, one and one-half in 

 suborbital space; gill rakers slender, about length of eye, 13 above and 25 below 

 angle. Adipose fin the length of eye, its width half its length. Narrowest part of 

 caudal peduncle contained nearly four times in greatest body depth. Dorsal rather 

 high, with nine or ten developed rays, the longest one-half longer than base of fin 

 and contained one and three-fourths times in greatest body depth, three and one- 

 fourth times in distance between dorsal and snout, and one and one-half times in 

 head ; free margin slightly concave; origin midway between end of snout and base 

 of caudal; dorsal base opposite nine scales. Anal with 10 to 12 developed rays, the 

 longest ray equal to base of fin and two-thirds of height of dorsal. Ventrals as long 

 as dorsal is high, their origin midway between anterior edge of orbit and base of 

 caudal. Ventral appendage short, covering about three scales. Pectorals as long as 

 ventrals. Scales rather large, about 75 in lateral line, seven or eight above the 

 lateral line, seven or eight below the lateral line. Lateral line straight except at 

 origin, where it presents a rather marked curve. Sides of body uniformly bright 

 silvery, with pronounced bluish reflection in life; the back dusky, the under parts 

 pure white without silvery color. Above lateral line, light longitudinal stripes 

 involving central part of scales extend whole length of body. Fins flesh color or 

 pinkish in life, the dorsal and caudal usually showing dusky edges : postorbital area 

 with a bright golden reflection; iris golden, pupil black. Branchiostegals, eight. 

 Average length, 15 inches. 



Habitat. Lake Ontario, Lake Michigan, Lake Superior, and doubtless the 

 entire Great Lake basin, in deep water. This fish is called Long Jaw in Lakes 

 Michigan and Ontario. Specimens were obtained from John S. Wilson, of Wilson, 

 N. Y., and from George M. Schwartz, of Rochester, N. Y. Dr. R. R. Gurley also 

 secured examples at Nine Mile Point, N. Y., in June, 1893. 



This species is quite different from any other Whitefish inhabiting the Great 

 Lake basin. It may be at once distinguished from all the Whitefishes known to 

 occur in the United States by the general form of body combined with the very 

 long lower jaw, which is contained less than twice in the length of the head and 

 extends backward to or beyond the posterior edge of orbit. 



