New species of Fresh Water Shells. 341. 
than to any other species. Beside its other characters, the uniform 
bluish white. color of the interior will distinguish it fromthe latter. 
AuasmoponTa RADIATA. PI. 1. fig. 10. 
"Shell ovate-acute, ventricose ; posterior end produced and pointed 
at the end; cardinal tooth in the right valve elongated and anterior 
to, and distant from the beak ; cardinal tooth in the left valve elon- 
gated, and situated Egacdinaly under the beak. 
Inhabits small streams in South Alabama. Length 24 inches. 
Cabinet of the Academy of Natural Sciences of Philadelphia. 
Shell ovate-acute, ventricose, with the posterior side produced and 
pointed at the end; beaks prominent and pointed at the apex, which 
has two or three profound undulations ; epidermis light olive, beauti- 
fully rayed with dark green; cavity mnie 2 nacre waxen yel- 
lowish. 
Anoponta supvexa. PI. 1. fig. 12. 
Shell sub-oval, inflated; thin; anterior end rounded ; posterior 
end subtruncated; posterior dorsal margin elevated and abruptly 
rounded at the extremity ; ; callus resembling an incipient tooth. 
Inhabits Black Warrior river. Length about 2 inches. Cabinet 
of the Academy of Natural Sciences of Philadelphia. Very rare. 
Shell sub-oval, inflated, thin, with prominent beaks, ugdulated at 
the apex, and not distant from the middle of the valve; umbo infla- 
ted; umbonial slope angulated, and the space behind si radiating 
Lines: ; epidermis olive and rather obscurely rayed ; cavity very capa- 
cious, most so behind the middle; nacre bluish, stained with a light 
waxen yellow. | 
Anoponta vectivis. PI. 1. fig. 11. 
Shell sub-ovate, thin, slightly ventricose ; posterior end spooked 
and cuneiform ; margin of the dorsal slope’ nearly rectilinear, and the 
extremity truncated ; beaks slightly prominent and Loa at 
the apex. 
Inhabits Flint river, “Morgan Co. Alabama, extrémely rare. sel 
34 inches. Cabinet of the Academy of Natural Sciences of Phil- 
adelphia. 
Shell sub-ovate, thin, slightly ventricose ; umbonial slope angulated ; 
posterior dorsal margin rectilinear ; epidermis green olive, with dark 
concentric wrinkled lines; and-on the posterior slope are numerous 
interrupted irregular lines; space behind the umbonial slope flattened ; 
