[32 ] 

 , 3. Vitrina Pfeiflferii, Newcomb. 



Plate 8, 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. limpida is smaller, with only 2| whorls, and thinner. V. 

 Angelicse is more globose, with 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^. 



Oenera. 



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



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

 ing and flattened above at the aperture. 



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



depressed, moderately umbilicated or perforated, or 

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

 shining, regularly increasing, 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 



