124 TUB NAUTILUS 



Polygyra obstrlcta Say. 



PolygyiH obstricta carolinensis Lea. Between the species and the 

 variety there is no dividing line. 



Polygyra sargentiana J. and P. A young shell from the south 

 end of Monte Sano is certainly this species. At Gurley, ten miles 

 east of Huiitsville, a smooth form of sargentiana is common, and will 

 likely be found also on Monte Sano. 



Polygyra appressa Say. Quite common in gardens. 



Polygyra appressa perigrapta Pils. Appressa is the common 

 form ill this region, contrary to the usual collector's experience in 

 North Alabama. 



Polygyra thyroides, Say. 



Polygyra spinosa, Lea. 



Polygyra stenotrema, Fer. 



Polygyra hirsuta, Say var. Differs constantly from typical hir- 

 suta by its smaller size and pronounced apertural features. 



Polygyra fraterna aliciae, Pils. 



Polygyra rugeli, Shutt. 



Polygyra smithii, Clapp. 



BulimulidcE. 

 Bulimulus dealbatus, Say. 



PupillUse. 

 Strobilops labyrinthica, Say, var. 

 Pupoides marginatus, Say. 

 Bifidaria procera, Gld. 

 Bifidaria armifera, Say. 

 Bifidaria tappaniana, C. B. Ads. 

 Vertigo rugosuia, Sterki. 

 Vertigo ovata, Say. 



Vertigo concinnula, Ckl). Very rare. Previously reported only 

 from the Rocky Mountain region ; determined by Dr. Pilsbry. 



Circinariid(B. 

 Circinaria concava, Say. 



ZonitidcB. 

 Omphalina kopnodes, W. G. Binn. This species attains its maxi- 

 mum development in this region. It is an abundant species, prefer- 

 ring the lower ridges rather the mountain-tops. 



