1911.] NATURAL SCIENCES OF PHILADELPHIA. 531 



VlTREA INDENTATA Say. 

 ZONITOIDES ARBOREA Say. 



Welch Landing, Ouachita River, Catahoula Parish, La.: 

 Strobilops strebeli Pfr. 



VlTREA INDENTATA Say. 

 ZONITOIDES ARBOREA Say. 



Pyramidula alternata Say. 



Junction of Bushley Creek and Old River, a fork of Little River, 

 Catahoula Parish, La.: 



ZONITOIDES ARBOREA Say. 



Donohue Ferry, Little River, Catahoula Parish, La. : 

 Strobilops labyrinthica Say. 



VlTREA INDENTATA UMBILICATA Ckll. 

 ZONITOIDES ARBOREA Say. 



Zonitoides MiNUSCULA Binn. 

 Euconulus CHERSINUS dentatus St. 



Two miles above Jonesville, Little River, La. : 



POLYGYRA THYROIDUS Say. 



Polygyra monodon friersoni Pils. A small form. 



POLYGYRA LEPORINA Gld. 



Pyramidula alternata Say. 



VlTREA INDENTATA Say. 



Zonitoides arborea Say. 

 Euconulus chersinus Say. 



Mr. Cody's Place, O'Neil Landing, Yazoo River, Yazoo Co., Miss.: 

 Polygyra appressa perigrapta Pils. 



BlFIDARIA CONTRACTA CLIMEANA Van. 



Bifidaria pentodon Say. 

 Strobilops strebeli aenea Pils. 



VlTREA INDENTATA Say. 



Zonitoides arborea Say. 

 Pyramidula alternata Say. 



Near Anderson Landing, Sunflower River, Sharkey Co., Miss.: 



Polygyra albolabris Say. Young. 

 Polygyra denotata Fer. 



