34 SALMONID^E. 



point of the nose and the origin of the short upper caudal 

 rays ; the base of the dorsal fin longer than the longest 

 of its rays ; the adipose fin large, and nearer to the end 

 of the tail than to the origin of the last dorsal fin-ray ; 

 the form of the tail at different ages has been noticed ; 

 the length of the pectoral fin very little more than half 

 the length of the head. The scales of the Salmon are 

 thin in substance, oval, with numerous concentric lines 

 only : the number of scales forming an oblique line from 

 the lateral line up to the base of the anterior part of 

 the dorsal fin, following the oblique arrangement of the 

 scales, about twenty ; and the number in a row from 

 the axillary scale of the ventral fin up to the lateral 

 line about eighteen. The scales of the Bull-Trout are 

 rather smaller than those of the Salmon in fish of equal 

 size, the number forming a continuous oblique row from 

 the lateral line up to the base of the dorsal fin being 

 about twenty-six ; the number of those forming a row 

 from the ventral axillary scale up to the lateral line, 

 whether taking the line that ascends obliquely forward 

 or backward, is about twenty-five ; the axillary scale 

 of the ventral fin nearly half as long as the fin itself: 

 the anal fin nearer the tail than in the Salmon ; all the fins 

 muscular. 



The fin-rays of the Bull-Trout in number are 



D. 11 : P. 14 : V. 9 : A. 11 : C. 19 : Vertebrae 59. 



In six specimens out of seven, the number of vertebrae 

 was fifty-nine ; in the other, sixty. Fifty-nine will proba- 

 bly prove to be the normal number in the Bull-Trout. 



The form of the body of this fish is similar to that 

 of the Salmon, but the nape and shoulders are thicker, 



