CLASS PISCES. 419 



Rhine, Penn., Zool. Britt. III. pi. lix. 1 ; which many 

 believe to be distinct, the greenish of the back forms, 

 with the white of the belly, zig-zags, in each of which 

 is a red spot. It is a small and delicious fish. 



Salmo umbla, L., Bl. 101. The scales are smaller, 

 and the teeth finer than in the others ; its spots are 

 but slightly marked, and are often wanting; its flesh, 

 though more fat and white, approximates to that of 

 the eel. The umbla of the Lake of Geneva is par- 

 ticularly celebrated \ 



Osmerus, Arted., 



Have two ranks of separated teeth in each palatine ; 

 but their vomer has but a few on the front. For the 

 rest, their forms are the same as those of the trouts, 

 but the membrane of their gills has but eight rays. 

 Their body is without spots, and their ventrals cor- 

 respond to the anterior edge of their first dorsal. 

 They are taken in the sea and in the mouths of great 

 rivers. 



But a single species is known, brilliant with the 



1 Besides these salmons and trouts of our rivers, the Russian and 

 American naturalists have described several, but which have not 

 been sufficiently compared with ours, so little so, that even Pallas 

 expresses some doubts respecting the authenticity of certain of his 

 species. We shall strive to clear up their synonymy in our great 

 work on Ichthyology ; but the details into which such a research 

 would oblige us to enter, can have no place here. In the other 

 work we shall also publish several North American species, part of 

 which have been already indicated by Messrs. Mitchill, Lesueur, 

 Rafinesque, Richardson, &c. 



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