40 POST-PLEIOCENE FOSSILS. 



three raised sub-laminated concentric lines; buccal and anal margins nearly equally- 

 rounded, the anal a little more pointed in some specimens; beaks central. 



This is a very abundant living species on the Southern coast, and somewhat resembles 

 in outline M. oblongata, but is easily distinguished, as the folds on the buccal end are 

 wanting; it is also a thicker shell than M. oblongata. — T. <$• H. 



Plate VII. Fig. 8, Natural size. 



Locality. Simmons'; Abbapoola; St. Andrew's. 



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



MACTEA LATERALIS. 

 Plate VII. Fig. 9. 



Mactra lateralis, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 309. 



Mactra lateralis, Con., Amn. Mar. Conch., p. 62, pi. 14, fig. 2. 



Mactra lateralis, Gould, Invert. Mass., p. 54, figs. 34, 35. 



Mactra lateralis, Ravenel, Cat. Coll. Shells, p. 2. 



Mactra lateralis, Stimpspn, Shells of New-England, p. 20. 



Mactra lateralis, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxii. 



Mactra lateralis, Be Kay, Zool. New- York, Art. Mollusca, p. 230, pi. 29, fig. 287. 



Mactra lateralis, Tuomey § Holmes, Pleiocene Foss. So. Ca., p. 97, pi. 23, fig. 9. 



Mactra lateralis, Say's Conch. U. S., (Binney,) p. 101. 



Description. Shell small, sub-triangular, smooth, or finely marked by the lines of 

 growth, sub-equilateral; buccal margin rounded; anal margin prolonged, pointed; buccal 

 region flat, heart shaped. — T. Sf H. 



This is also a common shell on the coast from Massachusetts to Florida. 



Plate VII. Fig. 9, Natural size. 



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



