THE NAUTILUS. 55 



Quadrula rumphiana Lea. Tombigbee river near Boligee, Ala. 



Quadrula pustulosa Lea. Tallabatchie, Yalabusha, Big Black, 

 Tombigbee and Tennessee rivers. Tbose from the Yalabusha, Tal- 

 labatchie and Big Black have few pustules, and occasionally one is 

 smooth. 



Quadrula rubiginosa Lea. Tallahatchie river, Abbeville, Miss. 



Quadrula cerina Conrad. Yalabusha and Tombigbee rivers. 



Quadrula hebetata Conrad. Big Black river, Durant, Miss. 



Quadrula rubida Lea. Big Black river, Durant, Miss. 



Quadrula obliqua Lamarck. Tennessee river, Florence, Ala. 



Quadrula solida Lea. Tennessee river, Florence, Ala. 



Quadrida plena Lea. Tombigbee and Tennessee rivers. 



Quadrula pyramidata Lea. Tennessee river, Florence, Ala. 



Quadrida subrotundus Lea. Tennessee river, Florence, Ala. 



Quadrula ebenus Lea. Tombigbee and Tennessee rivers. Common. 



Quadrula granifera Lea. Tennessee river, Florence, Ala. 



LYMNJEA DANIELSI SP. NOV. 



BY FRANK COLLINS BAKER. 



Lymneea danielsi sp. nov. 



Shell elongated, attenuated, of medium thickness ; color ranging 

 from very light-yellowish horn to dark chestnut or purple ; surface 

 shining, growth lines generally fine and close-set, but occasionally 

 as near the aperture, coarse and often raised into ridges ; last whorl 

 often malleated ; spiral sculpture of fine impressed lines ; apex 

 smooth, spermaceti-white in color; whorls 7, flat sided or slightly 

 convex, slowly increasing in diameter ; spire long and sharply 

 attenuated, longer than the aperture ; sutures impressed ; aperture 

 ovate, often a little triangular, somewhat flaring ; peristome sharp, 

 simple, bordered by a dark purple or chocolate band in many speci- 

 mens ; parietal wall with a thin callus, generally closely appressed 

 to the shell and almost closing the umbilical region, leaving a small 

 chink; axis gyrate as in stagnalis, forming a heavy, ascending plait; 

 interior of aperture varying from white to dark purple. 

 Length 28.5, breadth 12, aperture length 14, breadth 6.5 mm. 



