144 VITR1NA. 



Y. LTMPIDA, Gould. PL 30, figs. 26-28. 



Depressed globose, thin, fragile, very smooth and shining, 

 greenish hyaline ; whorls 2 J to 3, slightly convex, the last large 

 and much expanded, suture lightly impressed, sometimes with 

 an impressed line revolving near it ; aperture large, lunately 

 rounded. Diam. 6, alt. 3 mill. 



Northern United States, Maine to N. W. of 



Lake Superior, and in Canada. 



Smoother, more globose, the aperture more rounded and more 

 oblique than in V. pellucida of which it may, nevertheless, 

 prove a synonym. It is V. Americana, Pfeiffer. 



Y. PFEIFFEBI, Newcomb. PI. 30, fig. 29. 



Moderately depressed, smooth, shining, pellucid, greenish 

 white; whorls 3, the last large, suture ver}' finely margined; 

 aperture large, obliquely ovately rounded, lip thin, columella 

 arched. Diam. 6'5, alt. 2*5 mill. 



California to Utah, southwards to New Mexico. 



More depressed and stouter than V. limpida, with less promi- 

 nent spire than V. Angelicas. 



Y. MAJOR, Fer. PI. 31, figs. 30-40. 



Depressed, thin, smooth, pellucid, very shining, hyaline 

 greenish or greenish yellow ; spire very short, the apex not 

 prominent, suture lightly impressed, thread-margined ; whorls 3j, 

 rapidly increasing, the last depressed, somewhat lengthened, 

 subplanulate below ; aperture transversely lunar, somewhat 

 oblique. Diam. 8, alt. 3*75 mill. Middle Europe. 



Includes V. Draparnaldi, Guv. ; V. diaphana, Poiret ; Helix 

 elliptica, Brown ; Helicolimax Audebardi, Fer. ; V. pellucida, 

 Drap. ; V. depressa. Jeffreys ; V. Bland, Pollonera (figs. 33, 34). 



Yar. STABILEI, Lessona. PL 31, figs. 35-40. 



Shell a little more depressed. Pollonera considers it a 

 distinct species, and describes a variety of it as Locardi (figs. 

 38-40). 



Piedmont. 

 Y. Cos, Paulucci. PL 31, figs. 41, 42. 



Shell orbicularly subdepressed, fragile, yellowish or greenish, 

 conspicuously striate at the suture ; whorls 4, with crispate 



