I50 Bryant Walker 



LlTIIASIA CYLINDRICA Lea. 



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

 1868, p. 341, pi. 54, fig. 26; Obs., XII, 1868, p. loi, pi. 54, fig. 26. 



Type locality : Coosa River, Ala. 



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

 Ind., 1008, 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. pi. 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., VT, 

 1868, p. 340, pi. 54, fig. 23 ; Obs., XII, 1868, p. TOO, pi. 54, fig. 23. 



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



Lithasia wkeateeyi Lea. 



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



186S, p. 341, pi. 54, fig. 25 ; Obs., XII, 1868, p. loi, pi. 54, fig. 25. 

 Type locality: Cahawba River, Ala. 



Section ANGITREMA Haldeman, 1841. 



Lithasia angulata (Wetherby). 



Angitrcnia ayigulata Wetherby, Jour. Cin. Soc. N. H., 1876, p. 11, pi. I, 



fig- 5- 

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



Lithasia parva (Wetherby). 



Angitrcnia parva Wetherby, Jour. Cin. Soc. N .H., 1876, p. 9. pi. I, fig. 2. 

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



