172 ILLINOIS ACADEMY OF SCIENCE 
Subgenus Angustula Sterki ) 
86. V. milium (Gould)—Monticello, Piatt Co. Under a log 
in a wet lowland association, with Gastrocopta armifera var. 
affinis. Rare. 
Heterurethra 
Superfamily Elasmognatha 
Family Succineide 
GENUS SUCCINEA Draparnaud, 1801 
87. S. avara Say—Monticello, Piatt Co., Brownfield and 
Cottonwood Woods, Champaign Co. Not common. Usually 
found in a wet lowland association, attached to stones, leaves, 
stems and trunks of trees. 
Sigmurethra 
Superfamily Holopoda 
Family Helicidae 
GENUS POLYGYRA (Say, 1818) Pilsbry 
Subgenus Triodopsis Rafinesque, 1819 
88. P. albolabris (Say)—Hillery, Vermilion Co. It occurs 
plentifully among the leaves and under logs in the ravines of 
the moist woods. Usually associated with fraudulenta, elevata 
and zaleta. Forest fires almost wiped out this species and 
others of the genus from this area. 
89. P. clausa (Say)—Danville, Vermilion Co., in moist 
woods, under a log; not common. 
90. P. elevata (Say)—Brownfield Woods, Champaign Co., 
Muncie and Hillery, Vermilion Co. At Hillery, this species is 
very common on the wooded clay hillsides, and among the ac- 
cumulations of leaves and debris in the ravines. Associated 
with albolabris, thyroides, fraudulenta and zaleta. 
91. P. fraudulenta Pilsbry—Hillery, Vermilion Co., not 
very common. In the ravines, also in an outcrop of loess. Pre- 
fers a moist situation under fallen leaves or bark of logs. 
Usually associated with other of the larger gelices. 
92. P. mitchelliana (Lea)—Hillery, Vermilion Co., among 
leaves on moist ground in the ravines. Rare. 
93. P. pennsylvanica Green—White Heath, Piatt Co., 
Brownfield Woods, Champaign Co., Muncie and Hillery, Ver- 
