Baker—Molluscan Fauna of Tomahawk Lake, Wisconsin. 241 
storm. There is great variation in the length of the spire 
which may he elevated or greatly depressed. All speci¬ 
mens agree, however, in having a pronouncedly globose 
body whorl. The reference to Lymaoea decollata Mighels, 
from Madison, by Chadwick (p. 81) is founded on speci¬ 
mens of Galbra emarginata angulata Sowb., which is 
plentiful in the lakes near Madison. 
Sub-Order STYLOMMATOPHORA 
Family Succineidae. 
Genus Succinea Draparnaud. 
45. Succinea retusa Lea. 
Station II, XX 3 . In wet places, on debris or water 
plants. Apparently not common. 
Family Pupillidae. 
Genus Strobilops Pilsbry. 
46. Strobilops virgo Pilsbry. 
Stations I, XVIII, XIX. Common in damp places under 
logs, in started bark and crevices and on mouldy and de¬ 
caying leaves. Station I is a young deciduous forest while 
XVIII and XIX are virgin woods of pine, spruce, cedar, 
birch, etc. In these two habitats the shells were found on 
rotting birch logs, but not on pine logs. Stro'bilops virgo is 
very abundant in the forested area about Tomahawk Lake. 
Family Etoodontibae. 
Genus Helicodiscus Morse. 
47. Helicodiscus parallelus (Say). 
Stations I, XIX. Associated with Strobilops virgo , 
common. 
