CRUSTACEA — OSTEEIDiE. 9 



LUPA DICANTHA. — Lat. 

 Yulgo, Sea Crab, [not figured.'] 



Since our plate was drawn, several fragments of this species have been found. It is the 

 common edible crab, found living along the coast from Florida to Cape Cod. 



The five species of above-named decopodous crustaceans were all discovered in the 

 sandy beds of Post-Pleiocene age, at Mr. Simmons', Wadmalaw Sound. 



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



Class, ACEPHALA. Order, LAMELLIBRANCHIATA. Family, OSTREID^E. 



Genus, OSTREA.— Linn. 



OSTEEA V I E G I N I A N A . 

 Plate II. Fig. 9. 



Ostrea Virginiana, Lister, Conch, t. 200, f. 34. 



Ostrea Virginiana. Sowerby, Genera of Shells, fig. 2. 



Ostrea Virginiana, Conrad, Foss. Shells Tert. Formation, Vol. 1, p. 28, tab. 14, fig. 2. 



Ostrea Virginiana, Gould, Invert. Mass., p. 136. 



Ostrea Virginiana, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxii. 



Ostrea Virginiana, Tuomey $ Holmes, Pleiocene Foss. of So. Ca., p. 20, pi. 5, figs. 6 to 9. 



Ostrea Virginica, Gmelin, Syst., 3336, No. 113. 



Ostrea Virginica, Dillwyn, Catal., 1, 277. 



Ostrea Virginica, Lam., An. sans Vert., VII., 225. 



Ostrea Virginica, Wood, Index, pi. 2, fig. 68. 



Ostrea Virginica, Deshayes, Ency. Meth. Vers. II., pi. 179, figs. 1 and 2. 



Ostrea Virginica, Ravenel, Cat. Coll. Shells, p. 8. 



Ostrea Virginica, DeKay, Zoology New- York, Art. Mollusca, p. 169. 



Vulgo, Virginia Rock Oyster. 



Description. Shell irregular, ovate-oblong, thick; lower valve radiately plicate, 

 3 



