244 AMERICAN JOURNAL 



3. Vitrina Pfeifferii, Newcomb. 



Plate 3, figure 3. 



Globosely depressed, whorls 3; suture very finely margined; 

 aperture large, oblique, roundly ovate; lip thin, columella 

 arched. 



Diam. 5, height 2 mill. 



Carson Valley, Cal. 



V. Umpidi is smaller, with only 2§ whorls, and thinner. V. 

 Angelica is more globose, Avith more prominent spire. 



BINNEYA, Cooper. 

 1. Binneya notabilis, Cooper. 



Plate 3, fig. 4. 



Depressed, smooth and shining, epidermis extending be- 

 yond margin of aperture, translucent when young, but opaque- 

 ly thickened when old. Nuclear whorl with about thirty 

 delicate transverse ribs. Pale brown. 



Diam. 12, height 3 mill. 



Santa Barbara I., Cal. 



HELICELLIN^. 



Genera. 



1. Macrocyclis, Beck. Shell moderate, widely umbilicate, 



planorboid, striate; whorls 4-5, the last wide, descend- 

 ing and flattened above at the aperture. 



2. IIyalina, Ferussac. Shell moderate or small, globosely 



depressed, moderately umbilicated or perforated, or 

 umbilicus closed, but impressed; whorls 4-6, vitreous, 

 shining, regularly incrsasing, not angled at the pe- 

 riphery, nor flatly depressed at the aperture. 



MACROCYCLIS, Beck. 

 1. Macrocyclis Newberryana, W. G. Binney. 



Plate 3, figure 5. 



Large, whorls 6, first ones flattened, but ultimate one con- 

 vex, beneath convex; reddish-brown, striate, decussated by 



