6 SALMON ID.E. 



bone, with one line on the vomer between the palatine bones 

 when young, but the Salmon loses a portion of the vomerine 

 teeth during the first visit to salt water. I have observed 

 that some specimens of the migratory or Sea Trout carry 

 their vomerine teeth longer than the Salmon ; and those 

 Trout which do not migrate appear to carry their vomerine 

 teeth longrer than those Trout which do migrate. The teeth 



O 



on the vomer of the Salmon, when the fish is old, seldom 

 exceed two or three in number, sometimes only one, and 

 that placed on the most anterior part. The Salmon has 

 besides these, two rows of teeth upon the tongue, and one 

 row along the outer upper edge of each lower jaw-bone. 



The inner surface of the pectoral fin is in part dusky : 

 the tail very much forked when young ; the central caudal 

 rays growing up, the tail is much less forked the third year, 

 and by the fifth year it is become nearly or quite square at 

 the end. 



The descriptions of the gill-covers of the other species 

 will be given in the account of the fish to which they 

 belong ; but it may be remarked here, that looking at 

 the form of the three gill-covers, it will be obvious that a 

 line drawn from the front teeth of the upper jaw to the long- 

 est backward projecting portion of the gill-cover, in either 

 species, will occupy a different situation in respect to the 

 eye ; that the line will fall nearest the centre of the eye in 

 the first, that of the Salmon, and farthest below it in the 

 second, that of the Grey Trout. 



As further specific distinctions in the Salmon, I may add 

 that, according to Dr. Richardson, the csecal appendages are 

 in number from sixty-three to sixty-eight ; and several ob- 

 servers have stated the number of vertebrae to be sixty, 

 which I have repeatedly found to be correct. 



Commencing, then, with the true Salmon, which ascend 

 the rivers, in the state as to colour before mentioned, sooner 



