AND OTHER FAMILIES. 215 



Unio Griffithianus. Plate XV. fig. 46. 



Testa elliptica, expansa, transversd, inseqitilaterali, lateribiis subplanulatis ; 

 clivo umboniali rotundato ; valvulis subcrassis ; 7iatibus parvis ; epidermide hiteold 

 viridi-radiata ; dente cardinali parvo et lobis instructo ; later ali longo,curvo et ad 

 terminum posteriorem aucto ; niargarild purpurea, alba, velsalmonis colore tinctd. 



Shell elliptical, spread out, transverse, inequilateral, somewhat flattened on the sides ; 

 umbonial slope rounded ; valves somewhat thick ; beaks small; epidermis yellowish, 

 with green rays ; cardinal teeth small, lobed ; lateral teeth long, curved and enlarged at 

 posterior end ; nacre purple, salmon or white. 



Hab. South Carolina. Professor Ravenel. 



My Cabinet. 



Cabinet of Professor Ravenel, Charleston, South Carolina. 



Diam. -6, Length 1-2, Breadth 2-2 inches. 



Shell elliptical, spread out, transverse, inequilateral ; somewhat flat- 

 tened on the sides, rounded on the umbonial slope ; substance of the 

 shell somewhat thick ; beaks small, scarcely elevated ; ligament some- 

 what long and narrow ; epidermis yellowish, with green diverging rays ; 

 cardinal teeth small, lobed, disposed to be double in both valves ; lateral 

 teeth long, curved and enlarged at the posterior end ; anterior cicatrices 

 distinct ; posterior cicatrices confluent ; dorsal cicatrices situated across 

 the cavity of the beaks ; cavity of the beaks rather shallow ; cavity of 

 the shell shallow ; nacre purple, salmon or white. 



Remarks. — Although this shell is very like the complanatiis (Soland.), 

 I have thought it sufficiently distinct to separate it. It is more rounded 

 before, and more spread out, forming a more perfect ellipsis. In the 

 nacre it is very much the same. I name it after my friend R. E. 

 Griffith, M.D. 



Unio confertus. Plate XVI. fig. 47. 



Testd trapezoided, transversd, inaequilaterali, inflata; valvulis subcrassis; nati- 

 bus prominulis et transversim rugatis ; dentibus cardinalibus compressis, et in 



