14 THE NAUTILUS. 



MOLLUICA FOUND 111 THE VICINITY OF DTJBOI8, 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 small 

 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. leaii (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 (Strom.). Scarce. 



Vitrea wheatleyi (Bland). Rarely found. 



Vitrea indentata (Say). Common, generally found in open 

 situations. 



