74 POST-FLEIOOENE FOSSILS. 



COLUMBELLA ORNATA, — Ravenel. 

 Plate XII. Figs 6, 6a. 



Columbella ornata, Ravenel, Proc. -Elliott Society, Vol. 1, p. 281. 



Description. " Shell small, dirty white, ovate conic; wharls six or seven — in mature 

 species seven can be distinguished — nearly flat, with longitudinal ribs extending almost 

 to the apex ; revolving lines interrupted at the ribs, except near the base, where the ribs 

 become obsolete, and the revolving lines are uninterrupted and more decided than else- 

 where ; suture distinct, with the revolving line next below it more deeply impressed than 

 the others; aperture nearly half the length of the shell, narrow, with a rather deep sinus 

 at its posterior angle, ending in a short canal in front ; outer lip thickened and smooth on 

 the outside, being free from the ribs and lines of the whorls, within strongly toothed ; 

 pillar covered with smooth callus, the outer edge of which is elevated and sharp ; length 

 one-fifth inch." — E. Ravenel. 



The numerous distinct longitudinal ribs readily distinguish this beautiful little 

 species ; it is the most abundant of all the univalves of the Post-Pleiocene beds in South- 

 Carolina. 



Plate XII. Fig. 6, Natural size. 

 " 6a, Magnified. 



Locality. Simmons'; Cainhoy ; Waccamaw. 



Museum, College of Charleston; Cabinets Dr. Ravenel and F. S. H. 



COLUMBELLA LUNATA. — L. R. Gibbes. 

 Plate XII. Figs. 5, 5a. 



Nassa lunata, Saij, Jour. Acad. Nat. Sci., Vol. 5, p. 213. 



Buccinum lunatum, Adams, Boston Jour. Nat. Hist., Vol. 2, p. 266. 



Buccinum lunatum, Gould, Invert. Mass., p. 312, fig 196. 



Buccinum lunatum, De Kay, Zool. New- York, Art. Mollusca, p. 131. pi. vii, fig, 162. 



Columbella lunata, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xx. 



Columbella lunata, Stimpson, Shells of New-England, p. 48. 



Nassa lunata. Say, Conch. United States, ed. Binney, p. 122. 



Columbella spirantha, Ravenel, Proc. Elliott Society, Vol. 1, p. 281. 



Description. Shell about six volutions; whorls with two revolving lines of dilated, 



