FISHES. 549 



I cannot make out what Malmgren means by alluding 

 to the smaller size of this fish as a specific mark of dis- 

 tinction. Widigren in his above quoted description says 

 nothing of its smaller size. According to Lloyd, the lof sik 

 of the Wener attains an equal weight with C. oxyrTiynchus, 

 7 to 8 Ib. 



On this interminable question of the identity of the 

 different species of salmonidce, it appears that the rising 

 generation of naturalists are now all at once going to 

 settle it by jumping at conclusions which the naturalists 

 of the past generation had to puzzle out by very slow 

 degrees. I think that the British icthyologists, at least, 

 will be interested in some of the remarks which I have ; 

 quoted on this subject. 



104. C. MEGALOPS, Wid. N. Sp. 



See my preceding remarks on this new species. 



If we acknowledge this as a good species, and Malm- 

 gren's conjecture that Widigren's C. fera which he (Malm- 

 gren) includes in the list of Finland gwynniads as C. 

 Widigreni, turns out correct, we shall have six species of 

 gwynniad in Sweden, besides two forms, if not distinct 

 species, of vendace, but as I have before remarked, it is 

 excessively difficult, especially among the younger and 

 smaller examples of this family, to decide which is a species, 

 and which a mere form or variety. 



C. Under jaw projecting. 



105. COKEGONUS WIMBA, Nilss. Sik Wimma. Anims 



Wimma. 



Body undersized ; its height greater than the length 

 of the head, which is as one to six of the length of the 

 body ; upper maxillary broad, and ends under the front 

 edge of the pupil of the eye ; scales on the lateral line 

 about eighty; usual length 9 to '10 in.; colour above 

 dark green, tinged with blue; sides silvery; opercle 

 yellowish; fins small. D. 12; P. 16; V. 12; A. 15. 

 There is a question whether this is a distinct species or 



