THE BULL TROUT. 293 



middle dorsal ray and lateral line ; caeca fifty-four. Number of 

 fin rays— 1st D. 12 ; P. 12 ; V. 9 ; A. 10 ; C. 18. 



(Plate XXXIII.*— Salmon Bull- Trout.)— Length eighteen inches ; 

 female; three teeth on the anterior part of vomer; operculum rounded; 

 suboperculum rather large, its line of union with the operculum, 

 oblique; back bluish-black; pectorals dusky; caudal dark at the 

 margin ; spots having the form of X ; flesh deep red ; caeca fifty-four. 

 Number of fin rays— D. 11 ; P. 13 ; V. 9 ; A. 10 ; C. 20. Salmon- 

 Trout of Firth of Forth, Solway Firth, and Tweed, frequent; at 

 Berwick it is occasionally named Whitling. 



(Plate XXXIV. Fig. 9.— Crescent-tailed Bull-Trout.)— Length 

 twenty-two inches ; female ; one tooth in front of the vomer ; tail 

 lunate ; gill-cover rounded ; suboperculum narrow ; the basal margin 

 of the operculum very oblique and much curved; preoperculum 

 slightly sinuous ; spots large and distinct, of various forms, thirty- 

 seven below the line, and about eighty above it ; third ray of the 

 dorsal fin as long as the base of that fin ; all the fins as long in pro- 

 portion ; flesh red ; twenty-six scales in an oblique row between the 

 base of the middle ray of the dorsal fin and lateral line ; caeca fifty. 

 Bull-Trout of the Firth of Forth rare. 



(Plate XXXIV. Fig. 10.— Norway Bull-Trout.)— Length, twenty- 

 two inches ; female ; body much elongated ; five teeth in front of the 

 vomer ; caudal fin slightly forked ; operculum and suboperculum 

 very large, slightly produced behind ; basal margin of the operculum 

 rather oblique, in a line with the middle of the dorsal fin ; preoper- 

 culum rounded, not sinuous ; spots large and round ; seven below 

 the line, and twenty-two above it ; flesh yellow ; C8eca fifty-two. 

 Norway-Trout of the Firth of Forth, very rare. 



Salmo trutta.* — Salmon -Trout. 



Specific Characters. — Vomerine teeth not confined to the anterior 

 extremity, but extending far back ; sides with X-shaped spots ; tail 

 more or less forked. (See Plate XXXIV. Fig. 11.) 



Description. — From a female specimen twenty-five inches in length. 

 Form resembling more the salmon than that of the bull-trout ; nose 

 rather pointed ; head one-sixth of the whole length ; caudal fin in- 

 cluded ; greatest depth a little in front of the first dorsal. Colour of 

 the back bluish-black ; sides lighter, of a fine glossy blue ; belly, anal, 

 and ventral fins white ; head dark greenish-blue ; cheeks and gill- 

 covers light steel-blue ; spots on the sides numerous, having the form 

 of the letter X ; about a hundred below the line, and about one hun- 

 dred and twenty above it ; nine spots on the gill-cover, of a rounded 



• Salmo trutta, Yarr., Jen. 



