op coNcnoLOQY. 249 



*** Shell much depressed. 

 tff Diam. = 12—16 mill. 

 8. Hyalina sculptilis, Bland. 



Plate 3, figure 18. 



Depressed orbicular, subpellucid, pale horn color above, 

 lighter beneath, regularly striate above and below ; whorls 7, 

 planulate, the last rapidly increasing; umbilicus scarcely per- 

 forated and almost covered by a reflection of the lip. 



Diam. 12 J, height 5 mill. 



"Western North Carolina. 



In its depressed form, small size, nearly closed umbilicus 

 and number of whorls, this species is very distinct from any 

 other of the group. The impressed stria) are close and regular. 



9. Hyalina cellaria, Miiller. 



Plate 3, figure 19. 



Much depressed, whorls 5, fragile, polished, very light- 

 greenish above, more thickened and becoming lighter colored 

 below; aperture transverse ; umbilicus small and deep. 



Diam. 10—12 mill. 



Eastern and Middle States near the coast. (Introduced from 

 Europe.) 



10. Hyalina inornata, Say. 



Plate 4, figure 22. 



Depressed, perforate, smooth, shining, whorls 5, light yel- 

 lowish horn color, suture moderately impressed ; aperture 

 transversely lunar, with a white testaceous internal deposit ; 

 lip reaching to the centre beneath ; base flattened. 



Diam. 16 mill. 



Massachusetts to Virginia, and westwards to Iowa, Michigan 

 and Kentucky. 



Larger than H. cellaria, but with a much smaller umbilicus, 

 being a mere perforation. 



