11. COSEGONUS. 



191 



diameter of the eye. Maxillary short, two-ninths of the length of 

 the head, without longitudinal ridge, extending to below the adijjose 

 eyelid, but not to the eye itself; supplementary bone of the max- 

 illary broad, subsemicircular. The length of the mandible equals 

 the least depth of the tail. Back slightly arched. The origin of the 

 dorsal fin is a little nearer to the occiput than to the adipose fin. 

 Pectoral longer than the head, mthout snout. Male with numerous 

 small blackish dots on the head and the dorsal fin. 

 Lake Wenern. 



a. Fine male specimen, 12 inches long. From Mr. L. Lloyd's Col- 

 lection. 

 h. Skin, 18 inches long. From YarreU's Collection, 

 c~d. Adult, 15 inches long. From Mr. L. Lloyd's Collection. 



25. Coregonus megalops. 



Widegren, Ofvers. Vet. Akad. Fork. 1863, p. 589, taf. 11. fig. 15, 

 D. 14. A. 16, V. 11. L. lat. 92. 



The height of the body is nearly equal to the length of the head, 

 and one-fifth of the total (without caudal). Jaws equal in length ; 

 snout truncated, shorter than the eye, the diameter of which is not 

 much more than one-third of the length of the head. The distance 

 from the end of the snout to the hind margin of the orbit equals that 

 from its front margin to the praeoperculum. The maxillary extends 

 to the vertical from the front margin of the eye. 



Lakes of Northern Sweden. 



