46 PRELIMINARY REPORT 



the upper. Head short, contained 4^ times in the length. Dorsal 

 fin with 9 or 10 rays, the longest ^ longer than the base of the fin; 

 the first ray inserted nearer the snout than the base of the caudal 

 fin. Anal with 10 to 12 rays, the longest ray equal to the length 

 of the fin. Eye small, contained 1^ times in the snout. Scales 

 9-75-8. Gill rakers 15+28, about as long as the width of the eye. 



This is probably a common fish in Lake Superior, although there 

 is no recent data concerning it. It is described from Outer Island, 

 Lake Superior, as Argyrosomus lioyi Milner, Report U. S. Fish 

 Comm., XI, 1872-3 (1874), p. 80. (See Jordan & Evermann's Fishea 

 of North and Middle America, I, 472). 



Arg-yrosomiis nigripennis Gill. Bluefin. Blackfin. 



Sides silvery, upper parts dark bluish; dark dots on the sides; 

 fins all blue-black. Body rather heavy, compressed; back not 

 elevated; head large; mouth large, lower jaw projecting some- 

 what; maxillary bone reaching the front of the pupil, 1-5 longer 

 than the width of the eye. Head contained 4 times in the length. 

 Depth 4. Eye large, longer than the snout, contained 4 1-5 times in 

 the head. Dorsal fin with 12 rays. Anal 12. Scales 9 or 10-73 to 

 77-7 or 8. Length 18 inches. 



This is likely the white-fish that is reported so often from the 

 small lakes in the northern part of the state, although there is no 

 definite data concerning it except as listed from Lake Miltona, Min- 

 nesota, in Jordan & Evermann's Fishes of North America, I, 472. 

 White-fish, which may be this species, are reported very common 

 in Leech Lake (Nat. Hist. Surv., 1895), where they are taken in gill 

 nets by the Indians. 



Argyrosouius tuUibee (Richardson). Tullibee. Mongrel Whitefish. 



Sides white, edges of the scales with black dots; their centers 

 silvery, the silver areas forming longitudinal stripes; upper parts 

 of the body bluish. Body short, much compressed, curved as much 

 on the dorsal as on the ventral side. Head pointed; mouth large, 

 maxillary bone as long as the width of the eye, extending back of 

 the front of the eye. Head contained 4 to 4| times in the length. 

 Depth 3 to 3 1-5. Eye large, contained 4^ times in the head, as wide 

 as the length of the snout. Dorsal fin with 11 or 12 rays. Anal 11. 

 Scales with their free margins rather straight, much larger ante- 

 riorally than posteriorly, 8 or 9-67 to 74-8. Gill rakers slender, 16-t- 

 31, the longest equal to the eye. Length 18 inches. 



A very common fish in the state. Numerous specimens have 

 been taken from the lakes of the Upper Mississippi (Nat. Hist. 

 Surv., 1892-3-5) ; Lake of the Woods (Woolman & Cox, 1894). 



