THE AQUATIC VERTEBRATES IO33 



Saline and Washita, | mile above Arkadelpliia, Arkansas 47 ' 



Fort Smith and neighborhood S° 



Bean Blossom Creek, Indiana 44 



Cypress Creek, Alabama 42 



Obeys River, Tennessee 39 



Tuscaloosa, Alabama 32 



Mammoth Spring, Arkansas 37 



Washita, Arkansas 36 



In contrast with these the following poor faunas are recorded: 



Connecticut River 18 



Clear Lake, California 13 



Klamath basin, California 15 



The entire Yellowstone Park 10 



San Luis River, California 4 



Kicking Horse River, Canada 2 



Salt Lake basin 14 



Sevier River, Utah 7 



Columbia River System 37 



Colorado basin 33 



Pennamaguan Lake, Washington County, Maine 10 



Meddybemp Lake and Dennys River, Washington County, Maine 9 



Western Grand Lake System, Washington County, Maine 14 



St. Croix River basin, Washington County, Maine 8 



Perkins Lake, Idaho 7 



Alturas Lake, Idaho 4 



San Diego County, California 4 



Of these the Connecticut, Klamath, Yellowstone, San Luis, the 

 Maine lakes and streams, and Alturas Lake each have entirely 

 distinct faunas and the Columbia and Colorado have only a few 

 species each in common with the Salt Lake basin. It is qviite evi- 

 dent from an inspection of these lists, that a general consideration 

 of the fresh-water fauna of North America applicable to all cases 

 is quite out of the question. There are a number of quite distinct 

 faunas. A few general observations may be supplemented with 

 an analysis of a few typical localities to get at the nature of the 

 fish fauna. 



Jordan ^ summarizes a long experience of gathering fishes in 

 many waters of North America as follows: 



"Some of the conditions most favorable to the existence in any 

 stream of a large number of species of fishes are the following, the 

 most important of which is the one mentioned first: Connection 

 with a large hydrographic basin; a warm climate; clear water; a 

 moderate current; a bottom of gravel, preferably covered by a 



' Two localities are included in this and several in the total of 50 in the next. 

 » "A Guide to the Study of Fishes," p. 307. 



