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 PiipcB 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 



