27 
others at Harrigate. The smallest teeth of the labium are some- 
times obsolete. 
V. PENTODON. — Shell dextral, subovate, whitish horn color; 
apex obtuse, whorls five, glabrous, convex ; suture not very deeply 
impressed; aperture semioval; labium two-toothed, of which a 
single very prominent one is on the middle of the transverse por- 
tion or true labium, and the other is remote, much smaller, and 
placed in the basal angle of the columella ; labrum regularly 
arquated, tridentate, tooth nearest the base very small, and placed 
near the smaller tooth of the columella , the two others larger, 
subequal ; umbilicus distinct. 
Length less than one-tenth of an inch. 
Animal — tentacula two, rather long and thick, cylindrical, 
obconic, retractile, with a rounded oculiferous extremity ; two 
hardly elevated truncated tubercles instead of the anterior tenta- 
cula ; foot white ; head and neck, as far as the mantle, black. 
Inhabits Pennsylvania. The lower tooth of the labrum is some- 
times obsolete. 
Melampus obliques. — Obconic, reddish brown, rather thick ; 
spire very little elevated ; whorls eight or nine, wrinkled across ; 
labium with two very distinct teeth, and an intermediate and 
equidistant slight obtuse prominence ; inferior tooth very oblique, 
terminating at the base ; labrum with about eight teeth or strise, 
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 species, 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 specimens from the 
West Indies. 
In the Journal of the Academy, vol. v., page 119, et seq., anno 1825. 
Helix eallax. — Spire convex ; volutions five, with elevated 
lines forming grooves between them ; labrum reflected, contracting 
the aperture, bidentate ; teeth separated by a profound sinus ; 
superior tooth inflected into the mouth ; inferior tooth situated 
near the base ; labrum with a large, prominent, oblique, lamelliform 
