296 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



5. Coregonus quadrilateralis liichardson. 



Menominee Whitefish; Frostfish; Shadwaiter; Pilotfish; Chivey; Round 

 Whitefish; Chateaugay Shad; Blackback. 



Coregonus quadrilateralis Richardson, Franklin's Journ., 1823, 714, Fort Enterprise, 



British America. 

 Coregonus novce-anglice Prescott, Amer. Journ. Sci. Arts, XI, 1851, 342, Lake Winni- 



piseogee, N. H. 



Description. — Head, 5J to 5£; depth, 4§ to 5J; eye, 5 to 5f ; snout, 4£ 

 to 5; maxillary, 4* to 5£; mandible, 3 to 3f ; D. 11 or 12; A. 11 or 12". 

 Scales, 9 or 10-86 to 92-7 or 8. Gillrakers, 5 to 8+9 to 12, usually about 

 64-II, very short, the longest about 4 in eye. 



Body long, slender, and round, not much elevated nor compressed, 

 the back broad, and the body more nearly round than in any other 

 whitefisb. Head rather small and pointed; snout short, bluntly 

 decurved, projecting somewhat beyond the included lower jaw; maxil- 

 lary short and broad, scarcely reaching eye, the supplemental bone 

 very narrow; mandible very short, barely reaching posterior line of 

 pupil; mouth small, entirely below level of orbit. Top of head not 

 arched, cranial ridges prominent. Distance from snout to occiput 2f in 

 distance from occiput to origin of dorsal fin; origin of dorsal notably 

 in front of insertion of ventrals, equidistant from tip of snout and pos- 

 terior edge of adipose fin ; caudal peduncle long, If in head, somewhat 

 coai pressed. Base of dorsal fin short, If in longest ray or 14 in head; 

 anal base short, If in longest anal ray or 2f in head; pectoral, If in 

 head; ventral, If; adipose fin small. Color silvery white, dusky on 

 back and upper part of sides; under parts white; fins all pale except 

 dorsal and caudal, which are more or less dark on tips. 



The following table exhibits the variations in proportion of parts in 

 the specimens examined critically by us : 



Table of comparative measurements of specimens of the Menominee whitefish {Coregonus 



quadrilateralis) . 



