AVICULID/E. 15 



shell; the rest of the shell is naked, or without spines. It is living on the sea coast of 

 this State. 



Plate III. Fig. 2, A fragment, with restored outline. 



Locality. Simmons'; Abbapoola. 



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



PINNA MURICATA. 

 Plate III. Pig. 3. 



Pinna muricata, Linn, Syst. Nat., p. 1160. 



Pinna muricata, Gmel, p. 3364, No. 4. 



Pinna muricata, LamJc., An. sans Vert., Vol. 7, p. 64. 



Pinna muricata, De Kay, Zool. New- York, Art. Mollusca, p. 187. 



Pinna muricata, Ravenel, Cat. Coll. Shells, p. 7. 



Pinna muricata, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxii. 



Description. Shell large, fragile, pellucid, sub-truncated; the dorsal half covered with 

 numerous small, erect, sub-acute scales, arranged in longitudinal furrows; those on the 

 inferior half are much smaller; towards the umbones they become obsolete with age. 



As this is a delicate shell, we have obtained only fragments, but they are numerous, and 

 very characteristic of the species. Like its congener, P. seminuda, it lives upon the sea 

 coast, and was abundant in the Post-Pleiocene period. 



Plate III. Fig. 3, Fragment, with restored outline. 



Locality. Simmons'; Abbapoola. 



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



PECTUNCULUS CAROLINENSIS. — {New Species.) 

 Plate III. Fig. 4. 



Description. Shell sub-orbicular, equilateral, radiately ribbed; ribs twenty-three to 

 twenty-five, striate, depressed, disappearing on the buccal and anal margins ; concentric 

 lines few, wide apart; teeth seven to ten, robust; beaks prominent. 



