. [35] 



2. Perforate or umhilicate. 



* Yejy globose. 



2. Hyalina friabilis, Wm. Gr. Binnej. 



Plate 3, fig. 13. 



Whorls 5, rapidly increasing ; shell very globose, thin, pol- 

 ished, faintly striate, suture scarcely impressed ; aperture sub- 

 circular, sharp lipped, Yevy slightly thickened at base, and a 

 little reflected over the narrow, deep umbilicus; shell very 

 convex beloAV. Color light horn to reddish. 



Diameter 20 to 25, alt. 12 to 15 mill. Qmyr.q-M:."'^^' ^e^?. 



South Indiana and Illinois, Arkansas, Alabama, Texas. 



*^ Glohosely depressed. 



(Subgenus Omphalina, Rafinesque, W. Gr. Binney.) 



f Closely striate above, smooth beneath. 



Diam. = 20 mill. 



3. Hyalina laevigata, Pfeifibr. 



Plate 3, fig. 13. 



Whorls 5, yellowish or fulvous, very closely and regwlarly 

 striate above, smooth and shining beneath ; last whorl ex- 

 panding towards the aperture, which is rounded lunular ; lip 

 simple, slightly reflected around the moderate umbilicus, and 

 much thickened within at base. 



Diam. 20 mill. -tni-v-'^ <^o., Jir^r^. -*^"- '&<;''• ^-^^ 



Ohio, Indiana, and southwards to Florida, Mississippi and 

 Arkansas. 



f f Smooth, or coarsely, irregularly striate. 

 Diam. = 25 — 35 mill. 



4. Hyalina lucubra1;a, Say. 



Plate 3, figure 14. 



Depressed, sub-globose ; whorls more than 4, much wrin- 

 kled, sub-translucent, reddish-brown, polished, beneath paler ; 

 umbilicus rather large ; aperture nearly orbicular. 



Diam. 26, height 12 mill, ^^ll.?^.!^.: • 



Mexico. 



Differs in color and in being more depressed and more coarse- 

 ly striate, from laevigata, ri'r. 



