APPENDIX. 
ON THE CRUSTACEA EATEN BY FISHES. 
I have recognized the following genera and species of Crustacea in the 
stomachs of the fishes of the preceding list, several of them being new to the 
state. The material afforded has been by no means exhaustively studied, 
and the list of species could probably be quadrupled. I have refrained^ 
from formal description of some species which are evidently new, preferring 
to wait for specimens in more perfect condition. 
Cambarus immunis , Hagen. 
This is the only craw-fish I have yet noticed in the stomachs of fishes, 
and this I have seen but once (in the short-nosed gar), unless young indi- 
viduals eaten by a small cat-fish ( Amiurus melas) also belonged to this com- 
monest of our species. 
Allorchestes dentata , (Smith) Faxon. 
Specimens of Lepiopomus pallidus, taken in Crystal Lake, McHenry 
Co., in June, were feeding -chiefly on this crustacean. It has also been 
found in the same species, in L. ischyrus and in Morone interrupta from the 
Illinois at Peoria. 
Orangonyx gracilis , Smith. 
The western form of this species (see Bull. No. 1, p. 6) occurs abund- 
antly throughout central and southern Illinois. It is a very agile and vora- 
cious creature, behaving in a jar of entomostraca like a tiger in a sheep-fold. 
I have noticed that ponds in which it is at all common are nearly or quite 
destitute of Eubranchipus. The “handiness” with which it uses its anterior 
feet in feeding is quite amusing. I have found it eaten only by the Top 
Minnow ( Zygonectes notatus . ) 
Asellus intermedins , Forbes. 
Eaten by Aphododerus from Union Co. A species of Asellus described 
by Mr. 0. P. Hay, in the paper following this, as A. militarise has recently 
been collected in the Illinois River, and has been noted in the stomachs of 
