NEW FRESH WATER AND LAND SHELLS. 203 



and straight; anterior cicatrices distinct; posterior cicatrices confluent; dorsal 

 cicatrices placed under the plate between the cardinal and lateral teeth ; cavity 

 of the shell rather shallow; cavity of the beaks small and somewhat angular; 

 nacre white or salmon-coloured. 



Remarks. — Professor Ravenel sent me two specimens of this species some 

 time since. I have delayed describing it under the impression that it might 

 prove to be only a variety of confertus (nobis. ) After a careful examination, how- 

 ever, it appears to me to be distinct, and I propose to give it the name of my 

 friend Prof. Geddings of Charleston. It is a more transverse shell than con- 

 fertus, is less inflated, and less elevated on the umbonial slope. The older 

 specimen is partly salmon-coloured, the younger white in the nacre. 



Unio striatus. Plate 12, Fig. 16. 



Testa ellipticd, compressd ; valvulis tenuihus; natibus subprominentihus ; epidermide striata, rubiginis 

 colore; dentibus cardinalibus parvis; lateralibus sublongis subrectisque ; margaritd salmonis colore 

 tincta et iridescente. 



Shell elliptical, compressed; valves thin; beaks rather prominent; epidermis striate, rust-coloured; cardi- 

 nal teeth small; lateral teeth rather long and nearly straight; nacre salmon-coloured and iridescent. 



Hab. Chattahoochee River, Columbus, Georgia. Dr. Boykin. 



My Cabinet. 

 Diam. .3, Length .9, Breadth 1.3 inches. 



Shell elliptical, compressed ; substance of the shell thin, thicker behind ; beaks 

 rather prominent; epidermis striate in thin laminae; ligament short and thin ; 

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

 teeth rather long and nearly straight; anterior cicatrices distinct; posterior 

 cicatrices distinct; dorsal cicatrices very small and placed nearly under the 

 cardinal tooth; cavity of the shell shallow; cavity of the beaks very shallow 

 and nearly angular; nacre salmon-coloured, more intense under the beaks, 

 iridescent. 



RemarJcs. — A small species having some resemblance to U. Rave?ieliamts, 

 (nobis,) but not so thick, and more transverse. It is remarkable for the close 

 VIIL — 3 B 



