AMERICAN POND SNAILS. 



1, Paludina decisa. 2, 3. P. intertexta. 4. P. coarctata. 5. P. georr/iana. 6. P. conlecloides. 7, 8. P. ill- 

 tegra, 9. P mbpurpurea. 10, 11, 12. P. ponclerosa. 



