OF THE UNITED STATES. 877 



smaller tooth of the columella, the two others larger, 

 suhequal ; umbilicus distinct. 



Length less than one-tenih of an inch. 



Animal. Tentacufa two, rather long and thick, 

 cylindrical-obconic, retractile, with a rounded ocu- 

 liferous extremity; two hardly elevated truncated tu- 

 bercles instead of the anterior tentacula ; foot white ; 

 head and neck, as far as the mantle, black. 



Inhabits Pennsylvania. 



The lower tooth of the labrum is sometimes obso^ 

 lete. 



MELAMPUS. Montf. 



M. *obliquus. Obconic, reddish-brown, rather thick; 

 spire very little elevated ; whorls eight or nine, wrin- 

 kled across ; labium with two very distinct teeth, and 

 an intermediate and equidistant slight obtuse promi- 

 nence ; inferior tooth very oblique, terminating at the* 

 base ; labrum with about eight teeth or striae, which 

 terminate on the margin ; base of the aperture a little 

 contracted by the basal tooth. 



Length more than seven-twentieths of an inch. 

 I am indebted to Mr. Stephen Elliott for this spe- 

 cies, who obtained it on the coast of South Carolina. 

 It is closely allied to Bulimus monile, Brug. but it 

 has no appearance of bands, which distinguish that 

 shell. In the collection of the academy are speci- 

 mens from the West Indies. 



47 



