Shell-bearing Mollusca of Alabama. 



LAMELLIBEANCHIATA. 



CONCHIFERA. 

 Family TJnionlclfie. 



GENUS UNIO, Brug. 



U. abacus, Haldeman. Tennessee drainage. 



" acutissimus, Lea. Alabama river ; Coosa river. 



" -ZEsopus, Green. Tennessee drainage. 



" alatus, Say. 



" altilis, Conrad. Alabama river. 



" amoenus, Lea. Tennessee drainage. 



" Andersonensis, Lea. " " 



" Anodontoides, Lea. Chattahoochee and Alabama riv- 

 ers ; Bogue Chitto Creek. 



" appressus, Lea. Tennessee drainage. 



" aquilus, Lea. Chattahoochee or its tributaries. 



" arcaeformis, Lea. Tennessee drainage. 



" arctatus, Con. Black Warrior, Coosa and Cahawba 

 rivers. 



" arcus, Con. Alabama river. 



" argenteus, Lea. Tennessee drainage. 



" asper, Lea. Alabama river. 



" asperatus, Lea. Alabama and Coosa rivers ; Cahawba 

 river ; Buck creek. 



" atro-costatus, Lea. Alabama and Coosa rivers ; 

 hawba river. 



" atro-marginatus, Lea. Chattahoochee river. 



