74 POST-PLEIOCENE FOSSILS. 



COLUMBELLA RN A TA. — Ravenel. 

 Plate XII. Figs. 6, 6a. 

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



Description. " Shell small, dirty white, ovate conic; whorls 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 ail 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. Gibres. 



Plate XII. Figs. 5, 5a. 



Nassa lunata, Say, 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, hg 196. 



Buccinum lunatum, Be 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, 



