466 



Binney^s Monograph of the Helices 



whitish band, commencing at the exterior margin of the 

 right lip, and losing itself upon the columella : right hp 

 thick, white, indistinctly denticulated within, and con- 

 tinued in mature shells to the apex of the spire, which it 

 partially or entirely covers. Aperture narrowed. Four 



_ h 



folds upon the columella. 



Length six lines. 



Width three lines. 



Inhabits Key West, near the United States Barracks, 

 from whence it was brought by Mr. D. J. Browne. It is 

 contained in the Cabinet of the Society — ray own Cab- 

 inet — and several other collections in this city. 



This shell is readily distinguished by its beautiful flesh 

 color, and transverse whitish band. It more nearly ap- 

 proaches the M. olivaformisy Kiener, than any other 

 species : but the more conical spire, the three transverse 

 bands of a deeper color than the ground of the shell, the 

 smaller size, the wider aperture, and the locality of the 

 latter shell, prove its distinction. 



■^ 



ART. XXV.— A MONOGRAPH OF THE HELICES INHAB- 

 ITING THE UNITED STATES. By Amos BmNEY, M- D- 

 Read Nov. 19th, 1834, and at subsequent meetings. 



m 



The number of described species of the very natural 

 genus Helix, inhabiting the United States, is already 

 considerable ; and the researches of naturahsts are every 

 year adding to it. For a knowledge of the greater part 

 of them we are indebted to the labors of the late Mr. 



