16 POST-PLEIOCENE FOSSILS. 



This shell is very nearly allied to P. passus, Con., of the Pleiocene, but may readily be 

 distinguished by its wider and less numerous ribs, which are obsolete on both buccal and 

 anal margins, and by the beaks, which are much more prominent. 



We are not aware of its existence in a recent state. 



Plate III. Fig. 4, Shell, natural size. 



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



PECTUNCULUS CHAKLESTONENSI S— (New Species.) 

 Plate III. Fig. 5. 



Description. Shell small, somewhat oval, equilateral; buccal and anal sides slightly 

 truncated; ribs numerous, round and elevated; furrows narrow ; teeth small, numerous; 

 lips crenate. 



This shell has not yet been found living on the Carolina coast, but the small species of 

 the Florida coast seems to be identical with it. It resembles P. aratus, Con., of the 

 Pleiocene; but the ribs are less numerous, and the furrows between them very narrow. 



Plate III. Fig. 5, Interior and exterior of shell. 



Locality. Calhoun-street, Charleston. 



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



Genus, NUCULA.— Lam. 



NUCULA ACUTA. 

 Plate III. Fig. 1. 



Nucula acuta, Con., Mar. Conch., p. 32, pi. 6, fig. 3. 



Nucula acuta, Con., Foss. Ter. Form., p. 57, pi. 30, fig. 2. 



Nucula acuta, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxi. 



Nucula acuta, Tuomey $ Holmes, Pleiocene Fossils So. Ca., p. 53, pi. 17, figs. 10 to 12. 



Description. Shell somewhat lanceolate, inequilateral, concentrically striate; buccal 



