405 
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): NORTHERN (2): 
Hybognathus nubila Long-nosed sucker 
Flat-headed chub Nine-spined stickleback 
SOUTHERN (10): MAIN MISSISSIPPI (1): 
Harelipped sucker White sturgeon 
Pigmy sunfish 
Round sunfish SUBTERRANEAN (1): 
Eupomotts heros Chologaster papilliferus 
Hadropterus ouachite 
H. evides RARE IN ILLINOIS (2): 
Crystallaria asprella Brook lamprey 
Etheostoma obeyense Long-nosed dace 
E. squamiceps 
Brindled stonecat 
GREAT LAKES (5): 
Whitefish 
Lake herring 
Lake trout 
Cottus ricet 
Uranidea kumlienit 
As the Illinois basin contains 128 of the 150 species taken by us in 
the state, it is evident that the other and smaller basins must differ 
from this negatively rather than positively. Being not only much 
smaller, but also much less complex than the Illinois district, and 
offering less variety of situations for fishes as homes and places of 
resort, they may lack many species which find a fit environment 
somewhere in the Illinois or its dependent waters, but can contain 
relatively few not found there as well. 
Regarded from this standpoint, the Michigan district is farthest 
removed from the Illinois ichthyologically, and of its fifty-seven spe- 
cies nine (16 per cent.) are wanting in the Illinois basin. The Cairo 
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