BULINUS. 169 
Genus BULINUS, Adanson. 
1. BULINUS HYPNORUM, Linn. 
Haldeman, Monog. p. 36, t. 5, figs. 4—9. 
Physa 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, Currier. 
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) 
