952 The American Naturalist. [November, 
VERTIGO. 
Vertigo ovata Say, river drift at Alexandria. 
SUCCINEID.E 
SUCCINEA. 
Suceinea avara Say, Mt. Lebanon; ealeareous prairie lands 
of Winn Parish. On these lime prairies dead specimens are 
found several inches beneath the surface of the ground. I- 
imagine that they crawl into cracks in the ground during the 
dry summer months and are entombed. 
Succinea grovesnorit Lea, Jonesville, Texas; Boyce, La., and 
Bayou Pierre. These specimens are obtained in the damp rub- 
bish immediately above the water’s edge. They seem almost 
semi-aquatic. 
HELICINIDA. 
HELICINA. 
Helicina orbiculata Say, found by the thousands on the cal- 
careous prairies of Bienville, Winn and Catahoula Parishes, 
and very abundantly in the river drift at Shreveport. This 
species has a well-established reputation for its variability, and 
in Louisiana its reputation is well-sustained. 
FRESH-WATER SHELLS. 
AURICULID&. 
CARYCHIUM. 
Carychium exiguum Say, found in the damp leaves on the 
borders of many streams. This form could more appropriately 
be considered a land shell. 
LIMN.EID.E. 
LIMN.EA. 
Limnza columella Say, abundant in the ponds near Burk 
Place, La. | 
Limnza humilis Say, Bayou Pierre, and Boyce, La. 
