GREY TROUT. 75 



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 Grey 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 ven- 

 tral 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 this 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 vertebrse was 

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

 prove to be the normal number in the Grey Trout. 



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

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

 portion of the tail and the base of each of the fins more mus- 

 cular : the males are the stronger in the water, but the fe- 

 males are the more eager for bait, and their teeth are rather 

 smaller. The colours of the males in the spawning season 



