204 PROCEEDINGS OF THE ACADEMY OF [Feb., 



Polygyra monodon imperforata Pils. 



Proc. Acad. N. S. Phila., 1900, p. 4.5.5. 



Rich Mountain, Pollv coimty. Ark. The ordinaiy, widely distributed 

 P. m. f rater na occurs in southwestern Missouri. 

 Polygyra monodon aliciae (Pils.). 



Drift debris of the Arkansas river, at Petit Jean Mountain, Yell 

 county, Ark.; Hot Springs, Ark. ; DeKalb,* Ark., and Antlers,* I. T. 



BULIMULID^. 



Bulimulus dealbatus (Say). 



Seligman, Barry county, Mo. Two gray-mottled specimens collected 

 have the spire much longer than in ordinary dealbatus, and the whorls, 

 except the last two, are more strongly striate. The form approache.s 

 var. ragsdalei to some extent. 



PUPID^. 

 Bifidaria armifera (Say). 



Seligman, Barry county, ]\Io. 

 Bifidaria contracta (Say). 



Seligman, Barry county, Mo.; Rich Mountain, Polk county, Ark. 

 The season was not a propitious one for collecting minute snails, hence 

 their scarcity in this collection. 



AOHATINID^. 

 Cochlicopa lubrica (MiilL). 

 Seligman, Barry county, Mo. 



OIRCINARIID^. 

 Circinaria concava (Say). 

 Petit Jean,* Yell county, Ark. 



ZONITID.^. 

 Vitrea hammonis (Strom). 



Rich Mountain, Ark.; Seligman, Mo. 

 Vitrea indentata (Say). 



Poteau, Tushkahoma and Antlers, I. T.; Rich Mountain. Ark.; 

 Carrion Crow Mountain, Pope county. Ark.; Seligman, Mo. 



Section PAR A VITREA Pils. V 



Pamvitrea Pils , Nautilus, XI, p. 130 (March, 1898). 

 Taxeodonta Pils., Nautilus, XI, p. 1:^2 (March, 189S). 



Shell depressed or discoidal, perforate or narrowly umbilicate, com- 

 posed of numerous closely coiled whorls, usually grooved radially above; 



