12 POST-PLEIOCENE FOSSILS. 



squamose, spreading laterally ; hinge triangiilar; beaks sub-acute; lateral margins within 

 raised, crenulated; crenulations extending from the apex, a shorter distance on the anterior 

 side than on the posterior; basal margin smooth; muscular impression large. 



OsTREA FUNDATA as quotcd abovc, by Dr. Ravenel and Professor Gibbes, is attributed to 

 Say — but I have not been able yet to find, amongst Mr. Say's writings, any description 

 of this species. In courtesy, the specific name is retained. It is a common shell, adhering 

 to drift wood, shells, etc., in the bays of the Southern coast. 



Plate II. Fig. 10, Interior of valve, natural size. The apex has been hrohen off , 7vhich 

 gives the beak in our figure a truncated appearance. 



Locality. Simmons'. Museum, College of Charleston ; Cabinet F. S. H. 



PECTEN DISLOCATUS, 

 Plate 11. Fig. 12. 



Pecten dislocatus, Saty, Jour. Acad. Nat. Sci., Vol. 2, p. 260. 



Pecten dislocatus, Sag, Amn. Conch., pi. 56, fig. 2. 



Pecten dislocatus, Ency. Meth., pi. 213, fig 3. 



Pecten dislocatus, Conrad, Amn. Mar. Conch., p. 10, pi. 2, fig. 2. 



Pecten purpuratus, Lam., An. sans Vert., Vol. 7, p. 134. 



Pecten purpuratus, De Kaij, Zool. New- York, Art. Mollusca, p. 174. 



Pecten purpuratus, Rave?iei, Cat. Coll. Shells, p. 8. 



Pecten purpuratus, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxii. 



Description. Shell sub-orbicular, equilateral; the lower, or left valve, convex; the 

 upper, or right, more compressed, or flat; right auricle of right valve coarsely ribbed ; ribs 

 twenty to twenty-two, concentrically and finely wrinkled, and without longitudinal strise. 



The figure in Plate II represents the right valve of this fossil, which differs from the 

 recent species, in being more compressed, and cylindrical ; it is undoubtedly identical 

 with the one now in existence upon the coast ; the reddish, and almost obsolete spots so 

 characteristic of this shell, is retained in nearly all the fossil specimens, but the color of 

 the shell has been, in every instance, changed to a purpleish lead. 



Plate II. Fig. 12, Right valve, natural size. 



Locality. Simmons', and sub-marine beds on the Coast. 



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



