THE SALMON FAMILY. 241 



same length, in good condition, would weigh three-quarters 

 of a pound more. They become more robust, however, as 

 they increase in weight, a fish of four pounds resembling in 

 its outline the engraving of the Sea Trout in Yarrell's or 

 Frank Forester's book. 



In color, when fresh run from sea, this fish is of a light 

 bluish green on the back, light silvery gray on the sides, and 

 brilliant white on the belly ; the ventrals and anal fin entirely 

 white ; the pectorals brownish blue in front, and the posterior 

 rays roseate white. The tail is quite forked in the young 

 fish, as in all the Salmonidee, but when fully grown it is 

 slightly lunate. There are recurved teeth on the palate, max- 

 illaries, and tongue, but none on the vomer. 



If the number of rays in the fins indicate specific differ- 

 ence, or affinity, the following table will show that this fish is 

 more nearly allied to the Brook Trout than to the Sea Trout 

 of Europe: — 



Sea Trout (S. trutta) 



Canadian Trout (S. Canadensis) . . . 

 Brook or River Trout (S. fontinalis) . . 



There being only a difference of one ray in the pectorals, 

 which may be accidental. 



Although I have taken some trouble to prove that S. Cana- 

 densis and S. trutta are distinct species, and that the latter 

 does not exist in the waters of the Gulf of St. Lawrence, I 

 have no doubt that it is found in the Arctic Seas, on this side 

 of the Atlantic, as I have examined, at the Academy of 

 Natural Sciences, specimens of the young fish brought by 

 Dr. Hayes, in his last Arctic expedition, from Upernavik, 

 which agree exactly with the description of S. trutta given by 

 Yarrell. There were no markings, however, on the back, 

 which might be accounted for from the fact that the specimens 

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