BULL-TIIOUT. 



81 



ABDOMINAL 

 MALACOPTERYGII. 



SALMON I D^. 



THE BULL-TROUT. 



THE GREY TROUT. WHITLING. ROUNDTAIL. 



Salmo eriox, Linn^us. 



,, cinereus aut griseus, Willughby, 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 distinguished 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 suboperculum not so 

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

 the fish : the inferior edge of the suboperculum parallel to 

 the line of union with the operculum: the interoperculum 



