96 Sa'aps in Natural History. 



PaludincB. 



1. Paliidina limosa, Say, rare. 



2. P. lapidaria. Say, rare. 



PhyscB. 



1. Physa heterostropha, Say, common. 



2. P. gyrina, Say, common. 



LymnecB. 

 1. Lymnea elodes. Say, frequent. 



MelanicB. 

 1. Melania exilis, Haldeman, common. 



SuccinecB. 

 1. Succinea obliqua, (campestris,) Say. 



Anodo7itcB. 

 1. Anodonta Ferussaciana, Lea, frequent. 



Cyclades. 

 1. Cyclas similisj Say, common. 



AlasmodotitcB. 



1. Alasmodonta edentula. Say, frequent. 



2. A. calceola. Lea, frequent. 



Richmond, Wayne County, Indiana, April, 1844. 



Physa. I have found these only in running water. 



MeJania. Thousands are destroyed by swine in low stages of our streama. 

 These quadrupeds turn over the flat stones, to the under side of which the Jlf. exilis 

 adheres, and greedily devour the molluscs. 



Succinea ohliqua. I found great numbers of these adhering to the trunk of a 

 tree six and eight feet high from the swamp in which the tree stood. 



