CYCLADID^. 31 



I take pleasure in dedicating this pretty species to a highly valued friend, Major A. H. 

 Bowman, whose scientific attainments command for him the highest estimation of his 

 government, and the admiration of a large circle of friends in South-Carolina. 



Plate VII. Fig. 2, Natural size, and magnified hinge. 



Museum, College of Charleston; Cabinet F. S. H. 



CYEENA CAROLINIENSIS. 



Plate VI. Fig. 7. 



Cyclas Caroliniensis, Bosc, Hist. Nat. des Coq. 2, pi. 18, fig. 4. 



Cyrena Caroliniensis, Lamk., An. sans Vert., Vol. 6, p. 276. 



Cyrena Caroliniensis, Ravenel, Cat. Coll. Shells, p. 4. 



Cyrena Caroliniensis, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxi. 



Descriptioiv. Shell sub-cordate, thick, sub-inequilateral, tumid ; beaks distant, eroded. 



Only a single valve, much water-worn, and quite small, has been yet found in the 

 Post-Pleiocene ; it is abundant in the brackish water of the rush lands of the Carolina 

 sea-coast. 



Plate VI. Fig. 7. 



Locality. Simmons'; Doctor's Swamp, John's Island. Cabinet F. S. H. 



Genus, CARDITA.— Brug. 



CARDITA TRIDENTATA. 



Plate VI. Fig. 8. 



Venericardia tridentata, Saij, Jour. Acad. Nat. Sci., Vol. 5, p. 216. 



Cardita tridentata, Con., Foss. Ter. For., p. 76, pi. 43, fig. 11. 



Cardita tridentata, Tuomey Sf Holmes, Pleiocene Foss. So. Ca., p. 67, pi. 19, figs. 8 and 9. 



Cardita tridentata, Say's Conchology U. S., (Binney,) p. 194. 



Description. Shell round, triangular, thick, radiately ribbed ; ribs elevated, strongly 

 crenulated. 



