List of the Mollusca of Missouri. 73 



23. Amnicola lapidaria Say. 



Postpliocene : — Near St. Louis (Hambach). 



poMATiopsis Tryon. 



24. PoMATiopsis LAPiDAEiA Say. 



Camden Co. (1). 



In the collection of the Smithsonian Institution are 

 specimens from St. Louis, with a query as to whether 

 they were postpliocene. In Part II of the Land and 

 Fresh Water Shells Binney states that the species is 

 found from Missouri to Michigan. 



Pleurocerid^. 

 PLEUROCERA Rafinesquc. 



25. Pleurocera elevatum Say. 



Flat Creek, Barry Co. (6) ; Current River, Van 

 Buren, Carter Co. (9) ; Black River, Poplar 

 Bluffs, Butler Co. (13), South Missouri, (18); 

 Center Creek, Sarcoxie, Jasper Co. (15). 



26. Pleurocera elevatum lewisii Say. 



Spring, Howell Co. (10). 



27. Pleurocera subulare Lea. 



Niangua River, Hahatonka, Camden Co. (2) ; 

 James River, Galena, Stone Co. (2) ; Callaway 

 Co. (Greger). 



GONioBASis Lea. 



28. GoNioBAsis PLEBEius Auth. 



Osage River, Cape Galena, Morgan Co. (12) ; 

 Coffin Spring Branch, Morgan Co. (26) ; Gra- 

 vois Creek, Morgan Co. (37) ; Branch Indian 

 Creek, Morgan Co. (30) ; Mineral Branch, Mor- 



