FISHES OF LAKE SUPERIOR. 339 



know to which of them to refer it. I should not be surprised to find 

 it the type of a particular species. The details of the head not being 

 minutely given in the figure, do not allow us to make a direct com- 

 parison of them. 



The presence of small teeth on the surface of the tongue is an 

 almost universal character in Coregonus, though it is more evident in 

 the species in which the lower jaw is longer ; this would be another 

 character of this group, which would allow us to associate with it 0. 

 Labradoricus and Harengus, which M. Valenciennes was disposed 

 to discard from it. In the species with a truncated snout, and a 

 longer lower jaw, we remark that the intermaxillaries have a row of 

 teeth. These differences seem to me of sufficient value to justify 

 the formation of two distinct genera for these fishes. I would pro- 

 pose to preserve the name of Coregonus for those species in which 

 the snout is prominent, as it was primitively established with refer- 

 ence to such species in Europe. The name of Argyrosomus might 

 be applied to the other species, with a truncated snout and a promi- 

 nent lower jaw. 



The species of this continent may be grouped as follows :* 



Argyrosomus. Coregonus, proper. 

 * Coregonus clupeiformis DeKay. * Coregonus sapidissimus Agass. 



" * albus Lesu. " * latior Agass. 



" lucidus Richards. " albus Rich. 



" * Tullibee Rich. " albus Kirtl. 



" * Harengus Rich. " otsego Dekay. 



" Labradoricus Rich. " * quadrilateralis Rich. 



COREGONUS CLUPEIFORMIS, Dekay. 



SALMO CLUPEIFORMIS Mitch. Amer. Month. Mag. 1818, II., 321. 



( White-fish of the lakes.*) 

 COREGONUS CLUPEIFORMIS DeKay N. Y. Fna. 1842, p. 248 PI., 



60, f. 198, (common Shad Salmon.') Cuv. et Vol. H. N. Poiss. 



1848, XXI., 523, (excl. syn.) 



* The names in italics indicate species,to be revised. About C. Labradoricus we are 

 left in doubt as to its position. We have collected specimens of seven species in Lake 

 Superior, which are marked here with an asterisk (*). 



