252 AMERICAN JOURNAL 



17. Hyalina vortex, Pfeiffer. 



Plate 4, figure 28. 



Very much depressed above, almost planorboid, suture 

 deeply impressed, white, shining ; whorls 5, convex beneath ; 

 umbilicus narrow and deep. 



Diam. 5 mill. 



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. 



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

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

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

 forate. 



Diam. 5, altitude 2 - 5 mill. 



East Tennessee. 



ttftt Shell minute, not exceeding 3 mill. 

 19. Hyalina Binneyana, Morse. 



Plate 4, figure 31. 



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

 aperture well rounded ; umbilicus moderate. 



Diam. 3, height 1| mill. 



Maine. 



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

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

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

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

 Binneyana is pre-occupied in that genus. 



