T1IK NAUTILUS. 57 



U. obliquuf Lam. Decatur. 



U. orbiculalus Hild. Decatur. 



U. parvidus Lea. Mulberry River and Black Warrior River. 



U. penitus Con. Coosa River, Wetumpka and Black Warrior 

 River. 



U. perovalis Con. Mulberry River. 



U. perplexus Lea. Decalur. 



U. planus Lea. Coosa River and Fort William Shoals, two 

 specimens. 



U. plenus Lea. Decatur. 



U. pyramidatus Lea. Decatur. 



U. reclus Lam. Black Warrior River. 



U. rettisns Lam. Decatur, Ala. 



U. rubidits Lea. Black Warrior and Mulberry Rivers. 



[7. rubelhis Lea. Black Warrior River, Warrior, common. 



U. rumphianus Lea. Black Warrior and Mulberry Rivers. 



U. securis Lea. Fort AVilliam Shoals, Wetumpka and Decatur. 



U. spams Lea. Mulberry River. 



U. sublalus Lea. Mulberry and Black Warrior Rivers. 



U. stabills Lea. Black Warrior River. 



U. tuberculatus Barnes. Found at all river localities. 



U. vibex Conrad. Mulberry River, Blount Springs, Ala. 



U. vanuxemensis Lea. Wetumpka, Black Warrior and Talla- 

 poosa. 



Anodonta subvexa Con. Black Warrior River. 

 A. sp. Black Warrior River and Warrior, Ala. 

 A. sp. Coosa River. 



FAMILY CORBICULID^. 



Sphserium solidulum Prime. Bucksehatchee Creek, Calera, Ala., 

 common. 



S. striatinum Lam. Black AVarrior River, and AA T arrior. Rather 

 scarce, muddy places. 



Muscnlium contractum Prime. A single specimen taken from the 

 Bucksehatchee Creek, Calera, Ala. 



Pisidium virginicum Gmel. Tennessee River, Decatur, Mulberry 

 River, Blount Springs, Black Warrior River, AVarrior, Ala. 



