SALMONID^E. 



much deeper vertically ; the vertical edge of the preoper- 

 culum more sinuous. The teeth in the Grey 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 in the adult fish occupy the most anterior part 

 only. The tail becomes square at the end in this species 

 at an earlier period than in the Salmon ; and the central 

 caudal rays continuing to increase with age, the posterior 

 edge from being concave becomes convex. The Warkworth 



o O 



Trout and Coquet Trout of Northumberland and Durham 

 are the young of the Grey Trout. 



The Grey 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 

 and Cornwall : it occurs in the estuary of the Severn, and 

 I have seen it from the rivers of South Wales. Dr. Hey- 

 sham includes this fish among those of the rivers of Cumber- 

 land that run into the Solway. Sir William Jardine, Bart. 

 mentions it as occurring sometimes in the Annan in Dum- 

 fries-shire. Mr. Low says it is found in the loch of Stenness, 

 Orkney. In Ireland this species occurs on every side of the 



