1893.] : Mollusks of Louisiana. 953 
PLANORBIS. 
Planorbis trivolvis Say, var. lentus Say, abundant throughout 
the section. 
Planorbis dilatatus Gould, found in nearly all of the smaller 
streams. 
Planorbis bicarinatus Say, in the ponds around Burk Place. 
ANCYLUS. 
Ancylus obscurus Haldeman, found in nearly all of the smaller 
streams throughout the section. 
PHYSID.E. 
PHYSA. 
Physa heterostropha Say, found in all of the streams and ponds 
throughout the section. 
PALUDINID®. 
CAMPELOMA. 
Campeloma decisa Say, is as general in occurrence as Physa 
heterostropha. The form called C. coarctata by Anthony is 
found abundantly in many localities. This species is ex- 
- tremely variable, but the forms intergrade too well to separate 
them into several species. 
VIVIPARA. 
Vivipara subpurpurea Say, found abundantly in nearly all of 
the larger streams and lakes.. The specimens show great var- 
iation, but are too well known to conchologists to need special 
notice. 
Vivipara intertexta Say, Flagon Bayou, Rapides Parish, Lake 
Satt, pond near Jonesville, Texas. I have specimens from 
three other localities in Louisiana, showing that the species is 
widely distributed in the State, but I have never obtained it in 
large numbers, so it would be considered scarce. 
HYDROBIID.E. 
AMNICOLA. 
Amnicolo cincinnatiensis Anthony, Bayous in Claiborne Par- 
ish, and Lake Bisteneau. It is extremely abundant in Lake 
Bisteneau. 
