272 HELICID^. 



bi-lobed protruding beyond the aperture, and sligbtly 

 reflected. Posterior extremity rounded, sides corru- 

 gated, lower surface smooth, squalid. 



Shell sub-conical, smooth, incremental striae fine, 

 whitish, with longitudinal, irregular, undulating, or some- 

 what zigzag, dark-brown bands and clouds, intersected 

 by straight, revolving lines of the same color ; the body- 

 whorl often with one or more straight, brown lines, at 

 irregular intervals, indicating the former margins of the 

 aperture. Whorls six to seven, diminishing in diameter 

 rapidly, body whorl capacious, occupying two-thirds of 

 the whole length of the shell. Aperture ample, ovate, 

 showing the external colors within. Lip simple, acute, 

 bordered with dark brown, or black, both internally and 

 externally. Columellar margin with a thin, brownish 

 callus ; columella slightly thickened, not reflected, nor 

 truncate, making a continuous curve with the lip, imper- 

 forate. 



Common length of axis about two inches, diameter of 

 large whorl rather more than one inch. 



Geographical Distribution. Within the United 

 States proper, we are only certain of the existence of 

 this species in the southern part of the peninsula of Flo- 

 rida, and the islands adjacent. It is said to have been 

 found in the southern part of Louisiana. 



Remarks. This shell is one of very wide diifusion on 

 this continent. It is asserted by M. D'Orbigny, that it 



