526 PROCEEDINGS OF THE ACADEMY OF [Oct., 



St. Francis River, Cross Co., Ark., collected by Arthur W. Clime: 



POLYGYRA THYROIDUS Say. 

 POLYGYRA DENOTATA Fer. 



Circinaria concava Say. 

 Zonitoides minuscula Binn. 

 Mesomphix laevigata Beck. 



St. Francis River, seven miles above Parkin, Cross Co., Ark., 

 collected by Arthur W. Clime: 



Circinaria concava Say. 

 Omphalina friabilis W. G. B. 

 Zonitoides singleyana Pils. 



Near Wampoo Landing, Arkansas River, Pulaski Co., Ark.: 



POLYGYRA LEPORINA Old. 

 VlTREA INDENTATA Say. 



Zonitoides arborea Say. 

 Zonitoides minuscula Binn. 

 Helicodiscus parallelus Say. 



About twenty-five miles below Pine Bluff, Arkansas River, Jeffer- 

 son Co., Ark.: 



POLYGYRA THYROIDUS Say. 



About thirty miles above Pine Bluff, Arkansas River, Jefferson 

 Co., Ark.: 



POLYGYRA ALBOLABRIS ALLENI Wetll. 



Sladers Landing, Arkansas River, Jefferson Co., Ark.: 

 Polygyra inflecta Say. 



BlFIDARIA CORTICARIA Say. 



Strobilops labyrinthica Say. 



VlTREA SIGNIFICANS Bid. 

 VlTREA HAMMONIS Strom. 



Euconulus chersinus trochulus Reinh. 

 Helicodiscus parallelus Say. 

 Pyramidula alternata Say. 



Old River Landing, Arkansas River above Arkansas Post, Arkansas 



Co., Ark.: 



Polygyra thyroidus Say. Imperforate. 



