178 ILLINOIS ACADEMY OF SCIENCE 
everywhere and in all sorts of situations; perhaps the com- 
monest snail. It prefers damp places, especially under boards, 
logs, interstices of bark, fallen twigs, under stones, in leaf 
mould, and in crumbly soil. In Winter individuals are found 
all huddled together in deep crevices and in the burrows of in- 
sects. This species is associated with nearly all the mollusks ~ 
found in the Augerville Woods, including those of the hygro- 
phytic plant association. 
Gregarious, very active, very voracious. The shell is carried 
at an angle of 45°, the head and neck stretched out far. The 
eye peduncles are always thrust out nervously, as if in search 
of danger. It is relatively easy to separate arboreus from 
nitidus and hammonis by the manner in which the shell is ear- 
ried. In addition to this, the animal of nitidus is decidedly 
blacker. In hammonis the last whorl is much wider than in 
the other species. 
106. Z. minusculus (Binney )—Monticello, Piatt Co., Brown- 
field and Cottonwood Woods, Urbana, Champaign Co., Muncie, 
Vermilion Co. Not common. Found in the woods among 
decayed logs, in humus and old leaves, under bark, ete. It pre- 
fers damp and cool habitats, but at times is to be found in 
moist prairie situations, under boulders. This species is prob- 
ably subterranean in habits. 
107. Z. nitidus (Muller)—Monticello, Piatt Co., Brown- 
field and Cottonwood Woods, Urbana, Champaign Co., Muncie 
and Hillery, Vermilion Co. This species is commonly gregari- 
ous under logs and loose bark. It prefers damp situations and 
so far has been found in this region only along the shaded 
ravines. It often congregates in the interstices of the bark. 
Associated with arboreus, indentata, hammonis, a ea 
campestris and Gastrocopta contracta. 
GENUS GASTRODONTA Albers, 1850 
108. G. intertexrta (Binney)—Reported by Mr. Wm. A. 
Marsh from Vermilion Co. 
109. G. ligera (Say)—Reported by Mr. Wm. A. Marsh from 
Vermilion Co. 
Family Limacide 
