THE NAUTILUS. 55 



P. thyroides Say. Tallassee, Farmer and Warrior. 

 P. spinoia Lea, Blount Springs and Warrior. 

 P. stenotrema Bland. Blount Springs, Tallassee and Warrior. 

 P. hirsuta Say. Blount Springs and Warrior. 

 . P. downieana Bland. Blount Springs. Only one specimen found. 

 P. monodon fraterna Say. Tallassee. 



FAMILY CIRCINARIID^. 



Circinaria concava Say. Blount Springs and Tallassee. 



FAMILY ZONITID^:. 



Omphalina polita Pils. Blount Springs. Only two young ones 

 found. 



0. laevigata Pfr. Tallassee and Warrior. 

 . Vitrea carolinensis Ckll. Blount Springs, Tallassee and Warrior. 



Eucoiiulus sp. Tallassee. Young specimens. 



Zonitoides arboreus Say. Blount Springs, Tallassee and Warrior, 

 common. 



Gastrodonta demissa Binney. Blount Springs, Tallassee, Farmer 

 and Montevallo, 



G. interna Say. Blount Springs, Tallassee and Warrior. 



FAMILY ENnODONTID.t;. 



Pyramidula alternata Say. Blount Springs, Tallassee and War- 

 rior. 



P. perspectiva. Blount Springs, Tallassee, Warrior and Milstead. 

 Helicodiscus Uneatus Say. Tallassee. 



FAMILY IlELICINIU^. 



Helicina orbiculata Say. Only dead specimens were found at 

 Blount Springs. At Tallassee living specimens were found on a hill 

 under leaves where the ground was damp. 



FAMILY UNIONID/E. 



Not being familiar with Charles T. Simpson's classification of the 

 UnionidoB, 1 follow Dr. Lea, and use the genus Unio in its compre- 

 hensive sense. 



Unio acutissimus Lea. Mulberry and Black Rivers. 



U. idatus Say. Decatur. 



