COREGONUS WARTMANNI. 341 



found only in Lapland, and is recorded from the river Munio. Although 

 Cuvier and Valenciennes indicated a Coregonus from Lapland, under the 

 name of C. sikus, it is not possible to recognise it from their description. 



Coregonus gracilis ((TUNTHER). 



D. 14. A. 1516. Scales : lat. line 94100. transverse -- 



12 



This Swedish species is about fourteen inches long. In form of head it 

 most resembles Coregonus hiemalis. The body increases in depth with age, 

 and in the adult the height and the length of the head are respectively one- 

 fourth and one-fifth of the total length, without the caudal fin. The head is 

 five times as long as the eye. It is relatively small, much compressed, with 

 the snout pointed and rounded rather than obliquely truncate, still with the 

 upper jaw projecting beyond the lower. The interorbital space is convex and 

 less than twice the diameter of the eye. The maxillary bone, which measures 

 one-fourth of the length of the head, is not strong, and extends back only to the 

 fatty eyelid. The supplementary maxillary bone is short and semicircular. The 

 tail is rather elongated ; the dorsal fin is nearer to the back of the head than 

 to the adipose fin ; the pectoral fin increases a little with age. 



Coregonus widegreni (MALMGREN). 



D. 14, A. 16 17. Scales: lat. line 90, transverse 



A Coregonus, having the usual proportions of body, has been thus named, 

 and is found in the lakes of Sweden and Finland. Its snout is obliquely 

 truncated in front, and the upper jaw is considerably longer than the lower, so 

 that it belongs to the type of C. lavaretus, though the snout is not quite so 

 long. The maxillary bone extends a little farther backward, but the supple- 

 mentary maxillary is of similar form and size, and we have no doubt of the 

 propriety of regarding this form as a variety of that species. 



(3.) Species with the snout vertically truncated. 



Coregonus wartmanni (BLOCH). 



D. 1415, A. 15 16, V. 12, P. 1517, C. 19. Sq. lat. 8092, transverse ~ 



This fish (Fig. 165) is moderately elongated and compressed, with a small 

 pointed head and jaws of equal length, the upper reaching back as far as the 

 front of the orbit. The greatest height of the body in front of the dorsal 



