BULINUS. 169 



Genus BULINUS, Adanson. 



1. BULINUS HYPNORUM, Limi. 



Haldeman, Monog. p. 36, t. 5, figs. 4—9. 



PJujsa glabra, DeKay.— Plate 9, f. 17. 



There is no doubt of the identity of our 

 shell with the common European species bear- 

 ing the above name. The species is very 

 widely distributed east of the Rocky Moun- 

 tains but does not appear to inhabit the 

 Pacific Coast States. 



2. BULINUS TRYONI, Carrier. 



Plate 7, fig. 18. 



Shell cylindrical, smooth, dark horn color ; 

 whorls 6, flatly rounded ; aperture one-half 

 the length of the shell, pink within; colu- 

 mella twisted, with a light callus. 



(85) 



