1911.] NATURAL SCIENCES OF PHILADELPHIA. 527 



Between South Bend and Douglas, Arkansas River, Arkansas 

 Co., Ark.: 



Polygyra thyroidus Say. Umbilicate and imperforate. 



Near Menard Landing, Arkansas River, Arkansas Co., Ark.: 



Polygyra inflecta Say. 



BlFIDARIA CONTRACTA CLIMEANA Vail. 



Strobilops strebeli aenea Pils. 

 Mesomphix laevigata Pfr. 



VlTREA INDENTATA Say. 



Striatura milium Mse. 



ZONITOIDES ARBOREA Say. 



Zonitoides minuscula Binn. 

 Pyramidula alternata Say. 



Near Douglas, Arkansas River, Lincoln Co., Ark.: 



BlFIDARIA PENTODON Say. 



Zonitoides arborea Say. 

 Zonitoides minuscula Binn. 

 Pyramidula alternata Say. 



A few miles below Camden, Ouachita River, Ouachita Co., Ark.: 



Polygyra thyroidus Say. 



Polygyra obstricta carolinensis Lea. 



Kent, near Camden, Ouachita Co., Ark., about two miles from 

 the Ouachita River: 



Polygyra thyroidus Say. Imperforate. 



Polygyra inflecta Say. 



Polygyra leporina Gld. 



Polygyra obstricta carolinensis Lea. 



BlFIDARIA CONTRACTA Say. 



Vertigo milium Gld. 



Strobilops strebeli aenea Pils., Young. 



VlTREA INDENTATA UMBILICATA Ckll. 



Striatura milium Mse. 

 Zonitoides arborea Say. 

 Carychium exile Lea. 



Friar's Bluff, Ouachita River, Ouachita Co., Ark.: 

 Strobilops strebeli aenea Pils. 



