878 FISHES — SALMONID^. 



tt Preorbital long ana narrow; gill-rakers long and Blender; snpraoTbital oblong 

 maxillary comparatively long, the sapplemental bone ovate, rather broad. 



{Coregonus.) 

 t Tongue toothless, or nearly so ; back' elevated. . . clupeifoemis. 



t Tbngue with about three series of small teeth ; body elongate, compressed, the 



back not elevated labradobicus. 



"* Premaxillaries narrow, placed more or less horizontally ; mandible elongate, often 

 projecting ; the outline of the muzzle pointed ; all the bones of the head more or 

 less elongate. 



$ Body elongate, snbfnsiform, the dorsal and ventral curves not equal ; scales 

 small, uniform! convex bebind ; gill-rakers long and slender. {Argyrotomus, 

 Agaflsiz.) 



a. Lower jaw shorter, included ; premaxillfries oblique, their anterior mar- 

 gin In front below level of pupil ; scales bright silvery, not punctate. 



HOYI. 



aa. Lower jaw more or less projecting ; premaxillaries nearly horizontal, 

 their anterior margins in front, not below, the pupil; scales panctn- 



late with black artedi, nigbipinnis. 



$(Body short, deep, compressed, shad- like; curve of the back similar to that 

 of the belly ; scales large, larger forwards, rather closely imbricated, 

 the posterior margin little convex. (^Ztotomus, Jordan.) tulubee. 



92. Coregonus quadkilateralis Richardson. 



Pilot-fish; Shad Tl^aiter; R«un(l'Fish; menomonee White-fish. 



Siilmo {Coregonus) quadrilateralis, Kichardson, Franklin's Journal, 1823, 714. 

 Coregonus quadrilateralis, Gunthbr, Cat. Fish. Brit. Mus,, vi, 176.— Jordan, Man. Vert , 



2d Ed., 1878, 276, and of authors generally. 

 Coregonus novceanglcB, Prbscott, Amer. Journ. Set. Arts, xi, 1851, .342. 



Body elongate, not elevated, nor much compreissed, the back rather broad, the form 

 rather more terete than in any of the other species ; mouth very small and narrow, in- 

 ferior, the broad maxillary not reaching to opposite the eye, 5} in head ; head long, the 

 snout compressed and bluntly pointed, but not strongly decurred ; mandible originating 

 under middle of eye, 3^^ in bead ; adipose fin small ; gill-raker short and stoutish ; 

 snout scarcely below level of lower edge of eye; preorbital wider than pupil; head 5 

 in length; depth 4f ; D 11 ; A. 10; scales 9-80 to 90-8; color dark bluish above, silvery 

 below. Length about 1 foot. 



Habitat, deep, cold lakes. New Hampshire, Upper Great Lake Region, and northward 

 to Alaska. I have Been no specimens from Lake Erie, but it undoubtedly occurs there. 



Diagnosis. — From the other species of White-fish found in the Great 

 Lakes, this species may be known by its short, blunt gill-rakers and 

 broad preorbital. 



HahUs. — Little distinctive is recorded of the habits of the Menomonee 

 White fish. It is never taken in large numbers ; it inhabits considera- 

 ble depths, and the stomach is often found to be filled with email shells. 



