Kew 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 fi'om the latter. 



Alasmodonta radiata. pi. l.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 immediately under the beak. 



Inhabits small streams in South Alabama. Length 2J 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 capacious ; nacre waxen yel- 

 lowish. 



■ Anodonta subvexa. pi. l.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, undulated at 

 the apex, and not distant from the middle of the valve ; umbo infla- 

 ted ; umbonial slope angulated, and the space behind with 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. 



Anodonta DECLivis. PI. 1. fig. 11. 



Shell sub-ovate, thin, slightly ventricose ; posterior end produced 

 and cuneiform ; margin of the dorsal slope nearly rectilinear, and the 

 extremity truncated ; beaks slightly prominent and tuberculated at 

 the apex. 



Inhabits Flint river, Morgan Co. Alabama, extremely rare. Length 

 3^ 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 

 interriipted irregular lines j space behind the umbonial slope flattened j 



