128 FISHES. 



Aire — after a subterranean course of two miles. The beck 

 at Penyghent is exceedingly small, and after a short half- 

 mile course disappears in a similar manner. 



In Malham Tarn there are two varieties of trout, the 

 * silver trout ' and the * yellow trout,' both of which are 

 subject to the malformation before spoken of. The yellow 

 trout were by Mr. Couch erroneously considered to be 

 small examples of the Great Lake Trout {Salmo ferox\ 

 but on specimens of both forms being submitted to Dr. 

 Giinther they were pronounced to be of the same species. 



202. Salmo argenteus (C 6* V.), Silvery Salmon. 



203. Salmo brachypoma GUntk. Short-headed Salmon. 



This species — one of the most easily recognisable of the 

 salmonoids — was described by Dr. Giinther from speci- 

 mens from the Yorkshire Ouse, and from the Tweed and 

 Forth, and is a migratory form. The Ouse specimens in 

 the British Museum were presented in 1865 by Mr. 

 J. H. Phillips, of the ' Yorkshire Salmon Fishery Preserva- 

 tion Society, Beadlam Grange, Nawton.* 



204. Salmo gallivensis Gunth. Galway Sea-Trout. 



205. Salmo orcadensis GUnth. Loch-Stennis Trout. 



206. Salmo ierox Jard. &= Selby. Great Lake-Trout. 



207. Salmo stomachicus Gunih. Gillaroo Trout. 



208. Salmo nigripinnis Gunth. Black-finned Trout. 



209. Salmo levenensis Walk. Loch-Leven Trout. 



210. Salmo alpinus L. Alpine Charr. 



211. Salmo killinensis Gunth, Loch-Killin Charr. 



212. Salmo willughbii Gunth, Windermere Charr. 



213. Salmo perisii Giinth, Torgoch. Welsh Charr. 



