bui,l-tkoi;t, 



31 



AliDOMh\AL 

 MALACOPTERYCll. 



SALMON! D.E. 



THE BULL-TROUT. 



THE GllEY TROUT, 



WHITLING. 



IIOUKUTAIL 



Salmo eriox, Linnaeus. 



„ cinereus uut griseus, Willugiiby, p. 193. 



,, griseus sen cinereus, Ray, p. 63, A. 3. 



„ eriox, Grey, Penn, Brit. Zool. vol. iii. p. 394. 



,, Cambriscus, Sewin, Don. Brit. Fish. pi. 91. 



,, eriox, Grey, Flem. Brit. An. p. 180, sp. 46. 



The Bull-Trout is distinguislied from the Salmon 

 and Salmon-Trout by several specific peculiarities. The 

 gill-cover differs decidedly in form, as examination of the 

 central figure of the illustration at page 5 ■will show. 

 The operculum is larger ; the free vertical margin much 

 more straight ; the inferior posterior angle more elongated 

 backwards ; the line of union with the subopcrculum not so 

 oblique, but nearly parallel Avith the axis of the body of 

 the fish : the inferior edge of the subopcrculum })arallel to 

 the line of union with the operculum: the iiiteropcrculum 



