150 



SALMONID.E. 



lines about equal ; the lateral line passes straight along the 

 middle of the side, with six rows of scales in an oblique line 

 between the dorsal fin and the lateral line, and the same num- 

 ber between the line and the ventral axillary scale : the 

 dorsal fin commences half-way between the nose and the origin 

 of the upper caudal rays ; the longest ray double the length 

 of the base of the fin : the adipose fin very near the tail ; pec- 

 toral fin not quite equal to the length of the head ; the ventral 

 fin commences in a line under the first ray of the dorsal fin ; 

 the ventral axillary scale one-third the length of the fin ; the 

 anal fin commences half-way between the origin of the ventral 

 fin and the end of the fleshy portion of the tail ; the longest 

 ray about equal to the base of the fin : the tail deeply forked ; 

 all the fins large. The fin-rays in number are 



U. 11 : P. 16 : V. 11 : A. 15 : C. 19. Vertebrae 52. 



In form the under jaw is the longest ; the mouth small, 

 the opening square ; a few very minute teeth on the tongue 

 only : the breadth of the eye one-third of the whole head, 

 the posterior part of the iris the broadest ; the colour silvery 

 tinged with yellow, the pupil blue : the upper parts of the 

 body of a delicate greenish brown, shading gradually towards 

 the belly into a clear silver ; the dorsal fin a greenish brown ; 

 the lower fins are all bluish white. 



