182 



SALMONlD-a:. 



10. Coregonus gracilis. 



B. 9. D. 14. A. 15-16. L. lat. 94-100. L.transv. 11/12. 



The height of the body is one-fourth (in young examples one-fifth) 

 of the total length (without caudal), the length of the head one-fifth. 

 The diameter of the eye is contained five times in the length of 

 the head, and once and two-thirds in that of the head. Head small, 

 tapering, much compressed ; snout pointed, obliquely truncated or 

 rather rounded, with the upper jaw projecting beyond the lower. 

 Interorbital space convex, its width being equal to once and two- 

 thirds the diameter of the eye. The maxillary is short, feeble, 

 without longitudinal ridge, one -fourth of the length of the head ; i,t 

 extends to the cutaneous fold, or in young specimens to below the 

 adipose eyelid, but never to the eye itself. The supplementary bone 

 of the maxillary is short, broad, subsemicircular. The length of the 

 mandible is considerably more than the least depth of the tail. Back 

 ascending from behind the head in a slight curve. The origin of 

 the dorsal fin is nearer to the occiput than to the adipose fin ; tail 

 rather elongate. Pectoral as long as the head without snout, some- 

 what shorter in young examples. 



Sweden. 



a. Fine specimen, 14 inches long. Sweden. Presented by Hr. A. 



W. Mahu. 

 h-c. Fine specimens, 10 inches long. Gestrickland. From Mr. 



Wheelwright's Collection. 



11. Coregonus widegreni 



Coregonus fera, Wider/ren, Of vers. Vet. Akad. Forh. 1863, p. 64, taf. 10. 



figs. 1-2 (not synon.). 

 widegreni, Malmgren, Finlands Fish-fauna, p. 62. 



B. 9. D. 14. A. 16-17. L. lat. 90. L.transv. 10/11. 



The height of the body is one-fourth of the total'lcngth (without 



