274 HELICID^E. 



and ill-defined dark bands, and by the black line showing 

 the margin of a former lip. The columella is considera- 

 bly thickened and folded ; and the columellar margin is 

 covered by a black callus ; and the lip is broadly mar- 

 gined internally with black : further in, the aperture is 

 purely white. 



This species inhabits trees. It attaches itself to the 

 tree during hibernation, and covers its aperture by an 

 opaque, inspissated, glutinous secretion, which, though 

 exposed to wind and rain, forms a perfect adhesion and 

 protection to the animal, and only yields to its own sol- 

 vent powers on the approach of spring. It exists in great 

 numbers ; and the dead shells are a favorite habitation 

 of a species of hermit crab. 



3. BULIMUS SERPERASTRUS, SAY. 

 PLATE L. FIGURE 2. 



B. testa ovato^fusiformi, tenui, umbilicata, albida fasciis 

 inequalibus fusco-violaceis interrupts ad sex cincta ; spira 

 acuminata ; anfractibus ad septem convexiusculis ; sutura 

 linear! ; apertura angusta, lunata, spira breviore ; labro acuto, 

 expanse, albo ; columella superne dilatata, baud appressa ; 

 fauce fasciato. 



SYNONYMS AND REFERENCES. 



Bulimus serperastrus, SAY, Dissem. &c. ; New Terr. & Fluv. Shells, 25. 



PFEIFFER, Monog. Helic. Viv. II. 102. 



REEVE, Couch. Icon. pi. 40, fig. 252. 

 Bulimus nitelinus, REEVE, Conch. Icon. tab. 69, fig. 398. 

 Bulimus lilacinus, REEVE, Conch. Icon. tab. 74, fig. 532. 



DESCRIPTION. 



ANIMAL not known. 



