170 ILLINOIS ACADEMY OF SCIENCE 
GENUS STROBILOPS Pilsbry, 1892 
75. SS. affinis Pilsbry—In back yard of Mr. C. A. Hart’s 
home at 923 W. Green St., Urbana. Under logs that laid there 
undisturbed for many years. Not abundant with Gastrocopta 
contracta. 
76. WS. labyrinthica (Say)—Brownfield Woods only. Not 
common. It was found near the outer border of the woodland, 
in open spots as a rule. Under loose bark of logs, in half de- 
cayed wood, under logs, among dead leaves and in the sod at 
base of trees; usually associated with Gastrocopta contracta, 
Zonitoides arboreus, Vitrea indentata and Euconulus cher- 
sinus. Its movements are slow and deliberate. The shell is 
carried flat, occasionally wabbling from side to side. 
GENUS PUPOIDES Pfeiffer, 1854 
77. P. marginatus (Say)—Near the Cottonwood Woods, 
Champaign Co., and at Oakwood, Vermilion Co. This is a 
species of the open prairie, occurring under logs and railroad 
ties. It is seldom found in woods. 
GENUS GASTROCOPTA Wollaston, 1878 
78. G. armifera (Say)—Urbana and Mount Hope Cemetery, 
Champaign Co., Muncie, Vermilion Co. This species prefers 
the dry upland and open associations, living as a rule under 
logs, stones and other objects. Not found as yet in the deep 
forest. 
79. G. armifera Say var. affinis Sterki—Monticello, Piatt 
Co., under a log in a wet lowland association. This subspecies 
appears to be adapted to more hygrophytic habitats than is 
armifera 8. 8. 
80. G. contracta (Say)—At all localities in the three coun- 
ties. This is the commonest member of the Pupidae, and next 
to Zonitoides arboreus, perhaps the commonest snail. It pre- 
fers the mesophytic forest, living there under a great variety 
of situations, and from this optimum, it runs into both upland 
and lowland types, being able to withstand more the hydro- 
phytic than the mesophytic extremes. It commonly lives under 
bark and in the interstices of bark, under logs, ete. On one 
occasion fifteen specimens were collected from a square meter 
