FRESHWATER AND LAND SHELLS. 



Unio jejunus. Plate IV. fig. 9. 



Testa suboblong&, valde transversa, compressa, in(£quilaterali ; valvulis subtenuibus ; na- 

 tibus compressis ; dentibus cardinalibus parvis ; lateralibus longis rectisque ; margarita vel 

 purpurea vel alba. 



Shell somewhat oblong, very transverse, compressed, inequilateral; valves rather 

 thin ; beaks compressed ; cardinal teeth small ; lateral teeth long and straight ; nacre 

 purple or white. 



Hab. Roanoke. 



Also, near Camden, S. C. Dr Blanding. 

 My Cabinet. 

 Cabinet of Dr Blanding. 

 Diam. -5, Length 1-2, Breadth 2-5 inches. 



Shell somewhat oblong, very transverse, compressed, inequilateral ; 

 flattened on the sides ; subbiangular behind ; substance of the shell 

 rather thin ; beaks compressed, scarcely prominent ; ligament thin 

 and long ; epidermis very dark brown and much wrinkled ; cardinal 

 teeth small, double in the left and single in the right valve; lateral 

 teeth long, straight, and enlarged at the posterior end ; anterior cica- 

 trices distinct ; posterior cicatrices confluent ; dorsal cicatrices placed 

 in the centre of the cavity of the beaks ; cavity of the shell very shal- 

 low ; cavity of the beaks very small ; nacre purple or white. 



Remarks. — In crossing the Roanoke on the mail-route between 

 Winton and Tarborough in 1827, I found a few imperfect specimens 

 of this shell. Last year Dr Blanding had the kindness to give me a 

 more perfect specimen from near Camden, S. C, which confirmed me 

 in my previous impression of its being distinct from any described spe- 

 cies. In its general outline and appearance it strongly resembles the 

 U. complanatus (Soland.), but is more compressed, and is disposed to 

 be biangular behind. 



VI. — c 



