4)0 SALMONIDE. 



of the body alone, as one to four ; the depth of the body 

 compared to the whole length of the fish is also as one 

 to four : the teeth small and numerous, occupying five 

 rows on the upper surface of the mouth ; those of the cen- 

 tral row on the vomer extending some distance along it, 

 the points turning outwards alternately to each side ; one 

 row upon each side of the under jaw, and three or four 

 teeth on each side of the tongue, strong, sharp, and curving 

 backwards, well calculated to assist in holding a living 

 prey, or to convey food towards the pharynx : the middle 

 of the eye situated half-way between the point of the nose 

 and the posterior edge of the preoperculum : the form of 

 the parts of the gill-cover have been already described and 

 figured. The first ray of the dorsal fin is short ; the second 

 ray long, equal to the length of the base of the fin ; the 

 articulation at the base of the last dorsal fin-ray exactly 

 half-way between the point of the nose and the end of the 

 tail ; the fleshy fin on the back being also half-way between 

 the base of the last ray of the dorsal fin and the end of the 

 tail. The body of the fish rather deep for its length ; 

 the lateral line very nearly straight, and passing along the 

 middle of the body : the scales adhering closely ; in form 

 rather a lono-er oval than those of the Salmon, and liavino- 

 about twenty-three in the usual line up to the dorsal fin, and 

 twenty-two below it. The fin-rays in number are — 



D. 12 : P. 13 : V. 9 : A. 10 : C. 19. Vertebra 58. 



The upper part of the head and back dark bluish black, 

 becoming lighter on the sides, which are marked with nu- 

 merous spots, somewhat resembling in form the letter X : 

 these spots are mostly above the lateral line. The lower part 

 of the sides and belly silvery white ; cheeks and gill-covers 

 silvery white ; the dorsal fin, fleshy fin, and tail, nearly as 



