425 
The principal larger fishes of the smaller rivers make a much 
longer list, comprising the hogsucker, two of the native carp (vel1- 
fer and difformts), a species of red-horse (aureolum), the rock bass, 
and the small-mouthed black bass; and the principal smaller 
species are six darters (Etheostoma zonale, Hadropterus phoxocepha- 
lus, H. aspro, Diplesion blennioides, Etheostoma ceruleum, and Am- 
mocrypta pellucida), a stonecat (Noturus flavus), and Hybopsis 
kentuckiensis, and four other minnows, all of the genus Notropis 
(rubrifrons, gilbertt, blennius, and cornutus)—their ratios running 
from 70 per cent. for rubrifrons to 41 per cent. for cornutus. 
The species of our list which have from 50 to 100 per cent. of 
their representatives in creeks, as illustrated by our collections, in- 
clude three sunfishes (the green sunfish, the round sunfish, and the 
long-eared sunfish), three suckers (the common sucker, the chub- 
sucker, and the striped sucker), four darters, ten minnows, and the 
brindled stonecat. 
The larger species found most abundantly in lakes, ponds, and 
other stagnant waters were the common bullhead, the buffaloes, the 
yellow perch, the white bass, the yellow bass, the large-mouthed 
black bass, and five sunfishes (both crappies, the warmouth, the 
. pumpkinseed, and the bluegill); and the smaller kinds were the 
smallest of our fishes (Microperca punctulata), another darter (Bole- 
ichthys fustformts), two minnows (Notropis cayuga and N. heterodon), 
the mud-minnow, and a killifish (Fundulus dispar). 
Turning next to the 62 species for which our data of preference or 
avoidance of a muddy bottom are available, we find 7 species whose 
ratios of frequency of occurrence in such situations range from 43 
to 88 per cent., and which may consequently be called limophagous 
fishes. These are the warmouth sunfish, the black and the yellow 
bullheads, the pirate-perch, a single darter (Boleosoma camurum), 
and two minnows, the golden shiner and the common shiner (No- 
tropis cornutus.) 
It is interesting to find, by an examination of our maps, that all 
these 7 species are freely distributed over the lower Illinoisan glacia- 
tion of the southern part of the state, where, as we have already 
shown, only fishes indifferent to a peculiarly persistent turbidity of 
the water are likely to occur. 
