Natural History of the Sea Trout. 105 



These so-called salmon, thus designated by the 

 fishermen of San Francisco, are in all probability 

 the Salmo paucidens of Richardson, or the Salmo 

 quinnaty which are more allied to the S. tnitta 

 than to 5. Salar. 



Dr. Day says, " It is evident that our anadro- 

 mous sea trout may take on a fresh water state 

 of existence, and breed there, irrespective of 

 which, by imperceptible changes, we find it in every 

 country passing from one form into another. This, 

 of course, raises the question, of which form Salmo 

 Orcadensis, S. estuareus, &c., most resemble, the 

 anadromous 5. trutta, or the fresh water Salmo 

 fario. 



