32 SALMONIDyE. 



much deeper vertically ; the vertical edge of the preoper- 

 culum more sinuous. The teeth in the Bull-Trout are 

 longer and stronger than those of the Salmon ; but, like 

 the Salmon, the two or three teeth that may be seen on 

 the vomer occupy the most anterior part only. The tail 

 is square by the time this fish, is twelve months old, as is 

 shown in the figure above, from a female fish in its first 

 winter, at which period and during its second season it is 

 called a Whitling in the Tweed ; it is afterwards called 

 a Bull-Trout : and the central rays of the tail continuing 

 to increase in length with age, the posterior edge becomes 

 convex ; a variation in form which has caused this fish 

 to be designated in the Annan by the name of Roundtail 

 when old, and Sea-Trout when young. It is to this spe- 

 cies also that the names of Norway Trout and Norway 

 Salmon are believed to refer, as used occasionally on Tweed, 

 and some of the northern parts of Scotland. The Wark- 

 worth Trout and Coquet Trout of Northumberland and 

 Durham are the young of the Bull-Trout. 



The Bull-Trout, in all its stages of growth, is probably 

 better known in the Tweed than elsewhere : it is there 

 as abundant as the Salmon. I have had proof of the ex- 

 istence of this species in some of the rivers of Dorsetshire 



