XC11 



FISHES OF ILLINOIS 



Illinois as a whole. It includes, in fact, more than four fifths 

 of the species on our Illinois list, and the special features of the 

 various other basins and areas may best be seen by comparing 

 them with this characteristic central basin as a type. 



The following is a list of the species of the Illinois system 

 obtained by us in collections, arranged in the order of the 

 frequency of their appearance in 1,115 collections made from 

 that stream and its tributary waters. 



SPECIES OP THE ILLINOIS BASIN, AND NUMBER OP COLLECTIONS 

 CONTAINING EACH 



*A cross (+) in this column indicates the known occurrence of a species which is not repre- 

 sented in our collections from the Illinois basin. 



