338 LAKE SUPERIOR. 



mouth, larger maxillaries, and a different conformation of the oper- 

 cular apparatus, distinguish it sufficiently. 



All authors, after Lesueur, have been mistaken in the 0. albus ; 

 this would not be surprising had they nothing to guide them but the 

 short description of this author ; but the figure which accompanies it 

 leaves no doubt about his species, and the most superficial inspection 

 might suffice to give at least an approximate idea of it. In the 

 present state of the science I agree that we may confound our (7. 

 sapidissimus and 0. latior in their full-grown condition ; but where 

 the question is between so different species as O. albus Lesu., and 

 those (for we shall see that there are several) which authors have 

 designated under the same name after Lesueur, we may very 

 naturally ask ourselves, whether the information given by them has 

 been drawn from original sources, or has, perhaps, been published 

 under the belief that the fishes commonly designated under the 

 name of white-fishes, must all belong to the same species. 



There are two groups of Coregoni ; one having the lower jaw 

 longer than the upper, the other having a squarely truncated snout, 

 and the upper jaw overlapping the lower. O. albus Lesu. belongs to 

 the first of these groups, whilst the Coregoni described under the 

 same name by subsequent authors, belong to the second group. Let 

 us now review these latter, having no longer to compare them with 

 the species of Lesueur. 



Dr. Richardson has described and figured under the name of O. 

 albus, a species allied, in certain regards, to our C. sapidissimus and 

 C. latior ; but I think it cannot be identified either with the one or 

 the other, due attention being paid to the differences indicated in 

 our descriptions. Dr. Dekay gives this species as the C. albus in his 

 New York Fauna ; but not having seen, he says, the species, he 

 borrows his information from Dr. Richardson. 



Another species has been mentioned under the name of C. albus, 

 by Mr. Thompson. This species is our G. sapidissimus. 



A third species has hitherto been confounded with the preceding, 

 to which it approaches in several respects. This is our C. latior. 



Finally, I inquire what may be the O. albus of Kirtland ? The 

 figure which he gives of it is different at the same time from those 

 published by Dr. Richardson and Mr. Thompson, so that I do not 



