mSlKIBUTIOf; OF SPECIE".. 



87 



Tahle shoioing the Distribution of the Sj}eci('S in the Dijfercii River-Basins — Contiuued. 



From the above table, it will be seeu that the uumber of species 

 inhabiting any one river-basin rapidly increases as we leave the 

 Atlantic streams for those of the Gulf. The following table shows the 

 arrangement of the species from another point of view — omitting refer- 

 ence to the range of the species outside of the thirteen rivers included 

 in this table: 



Known onlv from the — 



Ohio . 



Alabama 



I Known only from the — 

 Species. I Species. 



30 I Tennessee 16 



17 Illinois 14 



