63 
body whorl regularly convex; base with a groove be- 
hind the columella; aperture suborbicular, patulous, 
OBSERVATIONS. 
Inhabits the Black W arrior river and Bayou T eche; 
the latter locality was communicated by Professor 
Green, who supplied me with a specimen. 
ANCULOTUS TiENXATUS. 
DESCRIPTION. 
Shell oval, or oblong; olivaceous, with dark green 
spiralbands, four on the body whorl; one whorl of the 
spire not eroded, often longitudinally produced. 
Length three-fourths of an inch. 
OBSERVATIONS. 
^Inhabits the friable calcareous banks of the Ala- 
bama river, at Claiborne. It is a pretty species, re- 
markable for its dark bands, which resemble those 
of Melania olivula , nob. of the same locality. 
* In my observations on the habits of this shell, I inad- 
vertently stated that it was exclusively devoted to calca- 
reous banks. I found them also on a siliceous breccia, 
near Claiborne, 
