I50 Bryant Walker 



LjTHASIA CYLINDRICA Lea. 



Lithasia cylindrica Lea, Pr. A. N. S. P., 1866, p. 133; Jour. A. N. vS. P., VF, 



186S, p. 341, pl- .S4, fig- 26; Obs., XII, 1868, p. loi, pi. 54, fig. 26. 

 Type localit}^ : Coosa River, Ala. 



Lithasia obovata (Say). 



Pilsbry (loi, p. 47) has figured the operculum of this species. 



For an account of the early stages of growth in this species, see Walker, 

 No. 143. 



Lithasia obovata biconica Pilsbry. 



Lithasia obovata biconica Pilsbry, 27th Ann. Rep. Dep't. Geol. & Nat. Resc. 



Ind., 1908, p. 604, fig. 23a. 

 Type locality : Wabash River, Gibson Co., Ind. 



Lithasia plicata Wetherby. 



Lithasia plicata Wetherby, Jour. Soc. N. H. Cin., 1876, p. 9, pl. I, fig. i. 



Type locality :_ Green River, Jackson Co., Ky. 



Lithasia purpurea Lea. 



Lithasia purpurea Lea, Pr. A. N. S. P., 1868, p. 153; Jour. A. N. S. P., VI, 



1868, p. 340, pl. 54, fig. 23; Obs., XII, 1868, p. 100, pl. 54, fig. 23. 

 Type locality : Cahawba River, Centreville, Bibb Co., Ala. 



Lithasia wheattEyi Lea. 



Lithasia zvheatleyi Lea, Pr. A. N. S. P., 1866, p. 133; Jour, A. N. S. P., VI, 



1868, p. 341, pl. 54, fig. 25 ; Obs., XII, 1868, p. loi, pl. 54, fig. 25. 

 Type locality: Cahawba River, Ala. 



Section ANGITREMA Haldeman, 1841. 



Lithasia ANGUEATA (Wetherby). 



Angitrema angulata Wetherby, Jour. Cin. Soc. N. H., 1876, p. 11, pl. I, 



fig- 5- 

 Type locality : Stone's River, Rutherford Co., Tenn. 



Lithasia parva (Wetherby). 



Angitrema parva Wetherby, Jour. Cin. Soc. N .H., 1876, p. 9,. pl. I, fig. 2. 

 Type locality : Stone's River, Rutherford Co., Tenn. 



