950 The American Naturalist. [November, 
Patula perspectiva Say, was collected at Columbia, near Rose- 
field, in Catahoula Parish, and near Ville Platte, in St. Landry 
Parish. Is not very abundant. 
PUNCTUM. 
Punctum pygmaum Draparnaud, near Mt. Lebanon. Rare. 
Dr. Sterki considered a specimen that I sent him this species. 
HELICODISCUS. 
Helicodiscus lineatus Say, found in many localities. Not very 
abundant. 
POLYGYRA. 
Polygyra leporina Gould, found in many localities in small 
numbers. 
Polygyra texasiana Moricand, found near Tullos, La., in cal- 
careous prairie, and in the Red River drift at Shreveport and 
Alexandria. 
Polygyra dorfeuilliana Lea, abundant at Mt. Lebanon, and is 
found in many other places. 
Polygyra espiloca Rav. A single specimen was collected on 
Catahoula Prairie, and some others were found near Ville 
Platte. 
STENOTREMA. 
Stenotrema monodon Rackett, var. fraternum Say, found in 
abundance throughout the section. The variation in size, and 
degree of compression of the spine is great. 
Stenotrema labrosum Bland, calcareous prairie at Tullos, and 
in the Red River drift at Alexandria. 
«X TRIODOPSIS. 
Triodopsis inflecta Say, was collected in a good many places, 
but is not very abundant. 
Triodopsis obstricta Say. I have collected specimens in the 
river drift at Alexandria and Shreveport. At Alexandria I 
also found some live specimens. Mr. Geo. Williamson has 
found the species rather abundant around Grand Cane. 
