PLEIOCENE FOSSILS. 71 



ASTARTE CONCENTRICA. 

 Plate XX. Fig. 3. 



Astarte concentrica, Con., Jour. Ac. Nat. Sci., Vol. 7, p. 133. 

 Astarte concentrica, Con., Foss. Ter. For., p. 44, pi. 21, fig. 6. 



A. testa trigona, depressa, sub-equilateralis, concentrice sulcata; sulcis regularibus; umboni- 

 bus acutis, recurvis; margine tenui crenato. 



Description. Shell triangular, depressed, nearly equilateral, concentrically furrowed, 

 furrows regular; umbones acute, recurved; margin crenate. 



This species is the most constant in form of this variable genus; but it is readily 

 distinguished by the regular and closely arranged furrows which cover the entire shell. 



Plate XX. Fig. 3, Interior of right and exterior of left valve, natural size. 



Locality. Waccamaw. 



Museum, College of Charleston. 

 19 



