144 VITRINA. 



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



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

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

 and much expanded, suture lightly impressed, sometimes with 

 an impressed line revolving near it ; aperture large, Innately 

 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. PFEIFFERI, 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. Angelicse. 



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



Depressed, thin, smooth, pellucid, ver} r shining, hyaline 

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

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

 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, Cuv. ; 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. COST^E, Paulucci. PL 31, figs. 41, 42. 



Shell orbicularly subdepressed, fragile, yellowish or greenish, 

 conspicuously striate at the suture ; whorls 4, with crispate 



