70 PLEIOCENE FOSSILS. 



ASTAIITIM. 



A ST ARTE.— Sowerby. 



ASTARTE UNDULATA.-S ay. 

 Plate XX. Pies. 1 and 2. 



Astarte undulata, Say, Jour. Ac. Nat Sci., Vol. 4, p. 150, pi. 9, fig. 5. 

 As.ta.rte undulata, Con., Foss. Ter. For. p. 41, pi. 20, fig. 4. 



A. testa sub-trigona, incequilateralis; umbonibus depressis, recurvis, sulcatis; sulcis irregu- 

 laribus, latissimis. 



Description. Shell somewhat triangular, inequilateral; umbon.es flat, recurved, fur- 

 rowed; furrows irregular, very wide. 



The broad furrows on the umbones of this shell distinguish it from the other species. 

 The furrows vary in number, and sometimes almost cover the valves; but this is rare. 

 The sudden curvature of the umbones gives the buccal slope a gibbous outline, and this 

 character is preserved in all the varieties. 



Plate XX. Fig. 1, represents a common variety. 

 " 2, Another variety, natural size. 



Locality. Sumter District. 



Museum, College of Charleston. 



