262 THE RIVER-SIDE NATURALIST. 



It appears to us that the fish is distinct from Salmo 

 trutta, but as the term is constantly applied to the various 

 forms of sea-trout, it would be of importance to ascertain if 

 the so-called bull-trout of other localities is precisely the 

 same as the bull-trout of the Tweed. 



The true bull-trout should be known under one specific 

 name, as S. eriox, and by that only ; and the so-called bull- 

 trout of other rivers should be either identified with this or 

 placed under S. trutta. 



THE RIVER-TROUT. 



The RIVER-TROUT (Salmo fario). Eight or nine different 

 species or varieties of British fresh-water trout are de- 

 scribed by ichthyologists. 



Dr. Gunther, " Catalogue of British Fishes," divides 

 Salmo fario into two races, a northern and a southern. 



The first he calls S. fario gaimardi, and places its 

 habitat in North Britain and Ireland, giving examples from 

 the Tweed, the Esk, the Clyde, and from various rivers and 

 lakes in Ireland. 



The second he calls S. fario ausonu, placing its habitat 

 south of the Tweed ; giving examples from Cumberland, 

 Westmoreland, Wales, Shropshire, Hampshire, Buckingham- 

 shire, Surrey, and the Thames. 



Dr. Giinther's species are S. fario gaimardi, S. fario 

 ausonii, S. orcadensis, S. ferox, S. stomachicus (the Gillaroo), 

 S. mgripinnis, S. levenensis, and two closely allied to the 

 non-migratory forms, S. brachypoma, which by some ich- 

 thyologists is considered to be identical with the phinnock 



