14 



A. arrnigera, Say. Tennessee river. 

 11 curta, Lea. Tennessee river, 



" lima, Con. Elk river, (Compare verrucosa, Eaf.} 

 " salebrosa, Con. Tennessee river. 

 " subglobosa, Lea. Tennessee river, 

 " Tuomeyi, Lea. Tennessee river. 

 *' verrucosa, Raf. Tennessee river. 

 " Wbeatleyi, Tryon. Elk river, 



Sub-genus LITHASIA, Haldeman. 



L. brevis, Lea. Alabama and Ooosa rivers. 



L. compacta, Anthony. Cahawba river; Buck creek. 



L. eylindrica, Lea. Coosa river. 



L. dilatata, Lea.' Tennessee river, 



L. Florentiana, Lea. Florence. 



L. fusiformis, Lea. Coosa river. 



L. imperialis, Lea. Tuscumbia. 



L. purpurea, Lea. Cahawba river. (See Gon. purpurea, 



Lea.) 



L. Showalterii, Lea. Cahawba river ; Alabama riven 

 L. vittata, Lea. Coosa and Cahawba rivers, 



Sub-genus STKEBHOBASIS, Lea. 



S. bitaaniata, Con. " Black Warrior river." 



S. carinata, Lea. " Tennessee river." 



S. Clarkii, Lea. " Tennessee river." 



S. cornea, Lea. Tennessee river. 



S. corpulerfta, Anthony. Tennessee river, 



S. Lyonii, Lea. Tennessee river. 



S. olivaria, Lea. Tennessee river. 



S. plena, Anthony. Tennessee river. 



S. solida, Lea. Tennessee river. 



Sub-genus TRYPANOSIOMA, Lea., 



T. abruptum, Lea. "Alabama," (Lea). 



T. affine, Lea. Tennessee river. 



T. Alabamense, Lea. Tennessee river. 



T. alveare, Conrad. Tennessee river. 



ST. annuliferum, Conrad. " Black Warrior river." 



