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.— Fig. 7. 
DESCRIPTION. 
Shell 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. 
■ , , ' J ' 
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 
