The Natural History of the Salmon. 69 



trout or Buddagh. Salmo nigripennis. Salmo Le- 

 venensis. Loch Leven trout. 



These are all non-migratory, the same characters 

 are found in the so-called Salmo hardini of Lake 

 Wenern, Sweden, Salmo Lemanensis of the Lake of 

 Geneva, etc. 



All these inhabit great internal lakes, most of 

 them landlocked or only communicating with the 

 sea by a most tortuous and difficult course. 



The question at once arises : Are not all these so- 

 called species derived from the Salmo trutta, and 

 only altered by altered circumstances ? 



THIRD. With two series of vomerine teeth. 



1. Disappearing with age. 



Salmo brachyopoma. White salmon of Pennant. 

 According to Dr. Day, this is a variety of the sea 

 trout. Parnell says it is the same as Salmo eriox. 

 Giinther says it is migratory, and is found in the 

 Forth, Tweed, and Ouse. It is more probably a 

 hybrid between Salmo fario and Salmo trutta?- 



2. Persistent during life, and non-migratory. 

 Salmo fario, the brook or river trout, which Dr. 



1 In March, 1881, I examined a very fine specimen of what 

 was sent to me as sea trout (Salmo trutta), caught in the smelt 

 nets at the mouth of the Medway. It was in very fine condi- 

 tion, and to all appearance, externally, was a Salmo trutta. 

 On examining the teeth, however, there was a distinct double 

 set on the vomer. Was it a Salmo fario or Salmo brachyopoma, 

 or a hybrid ? I am inclined to think the latter. 



