PAPERS ON ZOOLOGY 175 
97. P. hirsuta (Say)—White Heath, Piatt Co., Brownfield 
and Cottonwood Woods, Urbana, Champaign Co., Muncie and 
Hillery, Vermilion Co. A rather common species, living in 
damp situations, such as under debris or bark of fallen logs, or 
under loose bark of standing dead trees. Adults from the 
Brownfield Woods vary greatly in size. The following snails 
are associated with it: Gastrocopta contracta, Zonitoides 
arborcus, Vitrea indentata, V. hammonis, Polygyra thyroides, 
Pyramidula alternata and P. perspectiva. The animal is very 
active. The young are more gregarious than the adults. I 
found this snail frequently among the gills of fleshy fungi, and 
among mycelium. 
98. P.monodon (Rackett)—Muncie and Hillery, Vermilion 
Co. Its habitat is similar to that of hirsuta, excepting that it 
prefers drier situations. Usually it is found under stones. In 
one instance I found it in the open prairie, under a boulder. It 
associated with Vitrea hammonis, Zonitoides arboreus and 
Pyramidula perspectiva. The open prairie form is smaller than 
those from damp ravines. 
Superfamily Agnathomorpha 
Family Circinariide 
GENUS CIRCINARIA (Beck, 1837) Pilsbry 
99. C. concava (Say)—White Heath, Monticello, Brown- 
field Woods, Cottonwood Woods, St. Joseph, Homer Park, Mun- 
cie, Hillery and Danville. A fairly common species, found in 
almost all kinds of situations. At times it was found under four 
to eight inches of soil. It probably is also subterranean in hab- 
its. I have found it at night crawling boldly over logs in 
search of prey. It seems to prefer cool, damp woods, and at 
Hillery was rather abundant under debris on the banks of the 
Middle Fork of the Vermilion River. The species is more or 
less solitary in habits, though at times two and three may be 
found together; usually one or two of these disappear mysteri- 
ously. Ordinarilly concava is timid, but when in quest of food 
it knows neither fear nor delay, and its appetite is always 
voracious. The lair of Circinaria is decorated with the empty 
shells of its victims, in the main part species among which it 
had associated. These usually are our several species of Poly- 
gyra, Vitrea ndentata,iParavitrea significans, wvonitoides 
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