GENERAL AND INTERIOR DISTRIBUTION 



Ixxxix 



Species of the Illinois Basin, and Number of Collections 

 containing each — concluded 



Of the twenty-three Illinois species which have not been taken by 

 us in the Illinois River or its tributaries, two are distinctively western 

 fishes, and occur but rarely anywhere within our limits; nine are 

 southern species, few of which have been found as far north as the 

 mouth of the Illinois, and one other is only southern in this state; 

 two are northern species which barely reach our borders ; five are typ- 

 ical fishes of the Great Lakes; one has been found by us only in the 

 main Mississippi and the Ohio ; one is a subterranean fish of strictly 

 local occurrence; and the two remaining species are very rare in this 

 state. 



Further particulars as to the species of these various geograph- 

 ical groups are given in the following classified list. 



Illinois Species not found in the Illinois Basin 



western (2): 



// ybognathus nubila 

 Flat -headed i bul i 



northern (2): 



Long-nosed sucker 

 Nine spined s1 ii 1- leback 



