14 THE NAUTILUS. 
MOLLUSCA FOUND IN THE VICINITY OF DUBOIS, ILLINOIS. 
BY A. A. HINKLEY. 
For the identification of many of the species the author 
is indebted to Dr. Bryant Walker, Dr. V. Sterki, Dr. H. A. 
Pilsbry, Mr. F. C. Baker and Dr. Geo. H. Clapp. 
Polygyra appressa (Say). Lowland timber, a small form. 
Polygyra pennsylvanica (Green). Upland timber, a smal! 
rough form. 
Polygyra thyroides (Say). General distribution, variable in 
size, some small and thin. 
Polygyra clausa (Say). Upland timber, depauperate, few 
found. 
Polygyra hirsuta (Say). Lowland, a few found but once. - 
Polygyra monodon (Rack.) Upland timber, once found in 
numbers about old logs in a pasture from which the timber had 
been removed. This form has been known as P. leati (Ward). 
Strobilops labyrinthica (Say). On decaying logs and under 
leaves. 
Strobilops affinis Pilsbry. Found with the last. 
Pupoides marginatus (Say). R. R. embankment, scarce. 
Gastrocopta armifera (Say). Common. 
Gastrocopta contracta (Say). Common, also a variety for 
which Dr. Sterki has proposed the name abrupta. 
Gastrocopta corticaria (Say). Found in numbers on stand- 
ing trees. 
Gastrocopta pentodon (Say). Scarce, found in small num- 
bers in an outside entrance to the cellar of a deserted house. 
Gastrocopta tappaniana (Adams). A common species. 
Vertigo milium Gould. Scarce, under pieces of board and 
sticks. 
Vertigo ovata Say. But one specimen found. 
Circinaria concava (Say). Only one specimen. 
Vitrea hammonis (Strém.). Scarce. 
Vitrea wheatleyi (Bland). Rarely found. 
Vitrea indentata (Say). Common, generally found in open 
situations. 
