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 Limnceus in wanting the oblique fold on the 

 pillar ; from the Clausilia in being regular, and in 

 having the peristome simple and interrupted; and 

 from the Pupce 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. 



L 3 



