1 76 SALMONID^. 



^. Upper jaw the longer ^ vnth the upper profle descending tn a curve : 

 mmcth very S7ncdl, 



4. Coregonus quadrilateralis. 



Specimen c ; twice the natural size. 



Htchardson, FranMMs Journ. p. 714; and Faun. Bor.-Amer. iii. 

 p. 204, pi. 89. fig. 1 (from a stuffed example) ; Cuv. <§- Val. xxi. 

 p. 512 ; ? Agass. Lake Suj^er. p. 351. 



B. 7-8. D. 14-15. A. 13. L. lat. 86-90. L. transv. 10/12. 

 The height of the body is one-fifth of the total length (without 

 caudal), the length of the head one-sixth. Snout produced, com- 

 pressed, with its upper profile descending in a curve ; nose projecting ; 

 the mouth at the lower side of the snout. Maxillary very short and 

 small, its length being less than one-fifth of the length of the head ; 

 the supplementary bone of the maxillary narrow, elongate ; oper- 

 culum terminating in a right angle behind, conspicuously striated. 

 Back almost straight above. 



Arctic Ocean and rivers of Arctic North America. ? Lake Su- 

 perior. 



a, h. Adult, 18 inches long: stufied. Presented by J. Ray, Esq. 



c, d-h. Young. Port Halkett. Presented by B. E. Ross, Esq. 



t?. Skin, in a bad state. Saumuss Lake, Eraser's River. Collected 

 by Mr. Lord ; presented by Earl Russell. — This specimen ought 

 perhaps to be referred to C. wiUiamsoni ; but the shape of the 

 snout is entirely destroyed ; if the figure given of C. wiUiam- 

 soni is correct, it is a different species. 



The typical specimen is in the Collection of Haslar Hospital. 



5. Coregonus labradoricus. 

 . HicJiardson, Faun. Bor.-Amer. iii. p. 206. 



B. 8-9. D. 15. A. 15. V. 11-12. L. lat. 78. 



Body apparently much like that of C. qtiadrilateralis ; its depth 

 is one-fifth of the length (excluding the caudal). Head small, con- 

 stituting only a sixth part of the distance between the tip of the 

 snout and end of the scales on the caudal. The orbit is exactly 

 twice as far from the edge of the giU-cover as from the tip of the 



