53 



whorl entire, very convex; apex eroded; colour olive, 

 with two broad purple bands on the body whorl; one 

 on the contiguous whorl; columella with a callus 

 above and another near the base; aperture half the 

 length of the shell; labrum regularly arcuated; within 

 bluish, with purple bands. 



OBSERVATIONS. 



Inhabits the Black Warrior river. It is a rare 

 species, remarkable for its broad purple bands and 

 convex whorls. 



MELANIA COMMA. 

 Plate VIII.— F?;^. 7. 



DESCRIPTION. 



Sliell subulate, much elongated, slender; whorls 

 eight or nine, flattened, indented at the sutures, with 

 longitudinal distant, slightly arcuated ribs, disap- 

 pearing on the lower volutions; labrum thin; aperture 

 elliptical, produced at base; colour olive, with a dark 

 band above the middle of each whorl. 



OBSERVATIONS. 



Inhabits rivulets which are tributary to the Black 

 Warrior in mountain districts, in Alabama. It is 

 greatly elongated, and the ribs are separated by an 

 indented space at the suture. 

 E 2 



