X. 



NATURAL HISTORY OF THE RIVER 

 TROUT {SALMO FARIO). 



|R. GUNTHER divides the Salmo fario, 

 River Trout, of the British Isles into 

 two varieties, or species — 



(a) Salmo fario gaimardi. 



(b) Salmo fario ausonii. 



He says : " Among the numerous variations of 

 the River Trout, two forms deserve particular 

 attention — one, with fifty-seven or fifty-eight verte- 

 brae, is found in Central Europe and the southern 

 parts of England ; the other, with fifty-nine or 

 sixty vertebrae, inhabits the northern parts of 

 Europe, certain parts of Scandinavia, Scotland, 

 and Iceland. In Cumberland, some of the rivers 



