PAPERS ON ZOOLOGY 153 
of the entire State, representing some of our richest faunal 
regions, is still almost unknown so far as mollusks are con- 
cerned! 
It is to be hoped, however, that none shall stop at mere col- 
lecting of specimens, but that notes shall be taken of the 
ecology of the species found,—that apparent maze of interrela- 
tions existing between individuals, species and the complex 
environment, which, combined, spell life and give to Nature 
true orientation and significance. 
THH MOLLUSCA OF THE THREE COUNTIES 
The following are the localities visited: 
Piatt Co. (1 and 2) White Heath and Monticello; four trips 
to the Sangamon River and one trip to a small patch of woods 
near White Heath. 
Champaign Co. (8) Urbana; five visits to Mr. C. A. Hart’s 
back yard at 923 W. Green St., where several logs rested undis- 
turbed for years. (4) Mount Hope Cemetery, south of Urbana, 
one trip. (5) Crystal Lake and cut-offs near Urbana, nine 
trips. (6) Salt Fork, Urbana, one trip to the historic “bone- 
yard” branch, three to the main stream, and one to a sewer out- 
let. (7) Brownfield (Augerville) Woods, 314 miles Northeast 
of Urbana, about sixty trips. (8) the Cottonwood Woods, 4 
miles Northeast of Urbana, near the Brownfield Woods, ten 
trips. (9) St. Joseph, Salt Fork and Spoon Creek, two trips. 
(10) Homer and Homer Park, one trip. 
Vermilion Co. (11) Muncie, five trips to Stony Creek and to 
the woods bordering it, one trip to the Salt Fork. (12) Hillery, 
two trips to the Middle Fork and the woods bordering it, one 
trip to the woods north of Hillery. (13) Danville, one trip to 
woods northwest of town. 
Peculiarities of the Fauna 
The Sangamon River. It is a tributary of the Illinois River. 
During late Summer and Autumn it is very shallow at White 
Heath and Monticello. Due to the very high rises in Spring, 
which often overflow the river’s flood-plain, great changes occur 
in the mollusk habitats. In addition to the changes in depth of 
water and current, the character of the bottom changes in 
