HELIX. 173 



sema-circular, considerably contracted by the impressed 

 groove behind the lip, and a corresponding testaceous 

 deposit, or rib, within ; umbilicus small, round, not 

 expanded ; umbilical region not impressed ; base con- 

 vex. 



Transverse diameter five-sixteenths of an inch ; ordi- 

 narily considerably less. 



Geographical Distribution. It was found by Mr. 

 Charles Lea in the vicinity of Mobile, Alabama. Speci- 

 mens have been received by me from J. H. Couper, 

 Esq. from near Darien, Ga. 



Remarks. The above description applies to the 

 mature shell only. A great part of the specimens have 

 the aperture in a much less developed condition, — the 

 lip being acute, or the reflection but partly completed, 

 and the depression behind the lip not visible. The color 

 of the aperture, in some recent specimens, is delicately 

 roseate. The general aspect of this species is somewhat 

 like that of a Helicina. It is a pretty, and very dis- 

 tinct species. 



VOL. II. 44 



