FRESHWATER AND LAND SHELLS. 



Unio Vaughanianus. Plate III. fig. 5. 



Testa obovata, transversa, subinflata, postice subemarginata, incequilaterali ; valvulis te- 

 nuibus ; natlbus vix prominentibus ; dentibus cardinalibus parvis erectisque; lateralibus rectis; 

 margarita salmonis colore tincta. 



Shell obovate, transverse, somewhat inflated, subemarginate behind, inequilateral; 

 valves thin ; beaks scarcely pronainent ; cardinal teeth small and erect ; lateral teeth 

 straight ; nacre salmon colour. 



Hab. Sawney's Creek, near Camden, S. C. Professor Ravenel. 



My Cabinet. 

 Cabinet of Professor Ravenel. 

 Cabinet of Dr Blanding, 

 Uhio CaroUnensis.* Professor Haveners Letter. 

 Diam. -7, Length 1-2, Breadth 2 inches. 



Shell obovate, transverse, somewhat inflated, enlarged towards the pos- 

 terior basal margin, behind which it is subemarginate, slightly depressed 

 before the umbonial slope, inequilateral ; substance of the shell thin 

 and iridescent behind, thicker and salmon coloured before ; ligament 

 rather thin and short; epidermis almost black, and obscurely rayed 

 posteriorly ; cardinal teeth double in both valves, small, compressed and 

 erect; lateral teeth straight ; anterior cicatrices distinct; posterior cica- 

 trices confluent and scarcely visible; dorsal cicatrices placed in the 

 centre of the cavity of the beaks ; cavity of the shell deep ; cavity of 

 the beaks shallow and angular; nacre salmon coloured and beautifully 

 iridescent. 



Memarhs. — Professor Ravenel very kindly sent me specimens of 

 this shell nearly two years ago, and I owe to Dr Blanding the pos- 

 session subseq^uently of others. This species distinctly appertains to 

 that group of which the U. nasutus (Say) may be considered the type. 

 It is rayed like that shell, but may at once be distinguished by the 



* This name being preoccupied by Bosc for a shell of this genus, I have considered it 

 necessary to give it another, and propose that of the worthy treasurer of this society, John 

 Vaughan, Esq. 



VI. — B 



