8 



ANCYLUS DIAPHANUS, Hald. 



Plate 1. — Fig. 4. 



A. testa pallida, lata, tenui, subrotunda; apice submediali, 

 obtuso. 



DESCRIPTION. 



Shell thin in texture, diaphanous, very wide, 

 nearly circular, depressed: apex obtuse, almost 

 central: slope scarcely convex. 



Color very pale olivaceous, translucent, aper- 

 ture white. 



Dimensions. Long. 5.5, lat. 4.5, elev. 2 millim. 



Geographical Distribution. Discovered in 

 Ohio, by Mr. Anthony. 



OBSERVATIONS. 



Distinguished by its circular and flattened 

 form; and central, inconspicuous apex. 



