[40] 

 17. Hyalina vortex, Pfeiffer. 



Plate 4, figure 28. 



Yery mucli depressed above, almost planorboid, suture 

 deeply impressed, wliite, sliining ; whorls 5, convex beneath ; 

 umlDilicus narrow and deep. 



Diam. 5mill. C'on;,v. •^.-.-'ShT^o,....!^:' 



Florida and Cuba. 



Has one more whorl, and is more depressed than the other 

 species, also lighter in color. 



18. Hyalina capsella, Gould. 



Plate 3, figure 20. 



AVhorls 6|, planorboid, closely revolving, glistening; am- 

 ber colored, with distant strise ; aperture narrow, semilunar, 

 extending to the centre of the base, which is minutely per- 

 forate. 



Diam. 5, altitude 2'o mill. Coll.yf. {^.TvT. 



East Tennessee. 



ttttt Shell rainute^ not exceeding -8 mill. 

 19. Hyalina Binneyana, Morse. 



Plate 4, figure 31. 



"Whorls 4, spire slightly elevated, pellucid, nearly colorless ; 

 aperture well rounded ; umbilicus moderate. 



Diam. 8, height IJ mill. 



CcAyyQcM. Maine." 



Differs from H. minuscula in having the spire a little ele- 

 vated, and from H. electrina in being smaller and not increas- 

 ing the whorls so rapidly. If Hyalina is not adopted as a 

 genus, we suggest the name Helix Morsei for this species, as 

 Binneyana is pre-occupied in that genus. 



