194 PLANORBIS. 
B. SPECIES INHABITING THE ATLANTIC STATES. 
6. PLANORBIS LENTUS, Say. 
Haldeman, Monog. p. 18, t. 3, figs. 4—6. 
This is essentially a Southern species, and, 
assigned habitats in the North-western States, 
must be looked upon with some degree of sus- 
picion. 
7. PLANORBIS GLABRATUS, Say. 
Hald., Monog. p. 11, t. 2, f. 1, 3. 
Inhabits South Carolina, Georgia, Louisi- 
ana, Iowa; but nowhere common. It does 
not inhabit Oregon, as stated by Mr. Binney. 
The Oregon species referred to it is probably 
Pl. subcrenatus, Carpenter. 
(41) 
