BULIMUS. 
149 
adds, a perfect shell, and in the places where it 
abounds the larger shell is not found.” (^Berwick 
N. Hist. Club, p. 154.) 
It is common on the dunes near the sea, covering 
its shell with a viscous secretion, and in winter buries 
itself in the sand. 
6. Bulimus. (Twist Shell.) 
The animal is moderately large (like the snails), 
with four tentacles, a small elongate foot, and a 
long central, slender, spiral body covered with 
an oblong shell; the spire produced and ending 
rather acutely, with the ultimate volution larger 
than the next ; aperture oval, entire at the base, 
without teeth, not half as long as the spire ; the 
peristome interrupted ; outer lip generally thick- 
ened, reflexed. 
The shell of this genus is distinguished from that 
of LimncBus in wanting the oblique fold on the 
pillar ; from the ClausilicB in being regular, and in 
having the peristome simple and interrupted; and 
from the PupcB in having the spire regularly ta- 
pering. 
Probably called Bulimus from their eagerness to 
feed on vegetable substances. 
Hartmann, and more recently Mr. Broderip, have 
changed the name of this genus to Bulinus, think- 
ing probably that it was derived from the Bulin of 
Adanson ; but that is an Aplexus. 
They may be divided into two sections. 
