NATURAL SCIENCES OF PHILADELPHIA. 115 



Goniobasis instabilis, Lea. 



Locality 14. I have the name from Mr. Lea. The shells are 

 all smooth, which may account for their difficult identification. 



Melantho rufus, II a Id. 



Locality 20. Common. 

 Melantho docisus, Say. 



Locality 20. Less common. 

 Pomatiopsis lapidaria, Say. 



Locality 38. Not abundant. 



Mohawk. N. Y., Jan. 10, 1872. 



