1903.] NATURAL SCIENCES OF PHILADELPHIA. 213 



been found with teeth, but so far only smaU numbers have been takea. 

 The type is figured. 



Zonitoides minusculus (Binn.). 



Sehgman, Barry county, Mo. 

 Zonitoides arboreus (Say). 



Poteau, Tushkahoma, and Antlers, I. T.; Seligman, Mo. 



Gastrodonta demissa (Binney). 



Carrion Crow Mountain, Pope county, Ark. Twenty-one specimens, 

 most of them narrowly perforate, with a very heavy internal callus; 

 four have a low lamella, and one is imperforate. They therefore imite 

 characters of the varieties lamellata and hrittsi, hke those from other 

 places in their same general region. Cf. these Proceedings for 1900, 



p. 456. 



At Hot Springs, Garland county, Ark., G. demissa hrittsi was taken, 

 a few of the specimens having an internal lamina. 



Various forms of demissa were taken at Poteau* and Tushkahoma,* 

 I. T., and Rich Mountain,* Ark., reported by Mr. Ferriss. 



ENDODONTID^. 

 Pyramidula solitaria (Say). 



Reported from Rich Mountain, Polk county. Ark., by Mr. Ferriss. 



Pyramidula alternata (Say). 



Typical specimens at Petit Jean, Yell county, Ark., and SeHgmar., 

 Mo., and Standley, Choctaw Nation, I. T. Also reported by Ferriss 

 from Rich Mountain and Hot Springs, Ark. 

 Pyramidula perspectiva (Say). 



Reported by Ferriss from Seligman, Mo.; Petit Jean and Rich 

 Mountain, Ark. 



Helicodiscus lineatus (Say). 

 Seligman, Barry county. Mo. 



SUCCINEID^. 

 Succinea avara Say. 

 Seligman, Mo. ; Rich Mountain, .^k. 



LIMN^ID^. 

 Limnsea columella Say. 

 Winding Stair Mountain, I. T. 



