PLEIOCENE FOSSILS. 37 



AECA CENTENARIA.— Say. 



Plate XIV., Figs. 11 and 12. 



Area Centenaria, Say, Jour. Ac. Nat. Sci., Vol. 4, p. 138, pi. 10, fig. 2. 

 Area Centenaria, Con., Foss. Shells, Ter. For., p. 16, tab. 1, fig. 4. 

 Area Centenaria, Con., Foss. Ter. For., p. 55, pi. 29, fig. 4. 



A. testa ovato-quadrata, radiatim striata; striis numerosis, confertis ; margine palliali 

 excavato ; area ligamenti ampliori, striata. 



Description. Shell ovately square, radfately striate ; striae , numerous, close ; pallial 

 margin contracted ; ligament area somewhat wide, striate. 



This shell is sufficiently well characterized by the numerous and somewhat irregular 

 radiating lines, which are alternately larger and smaller. The surface is rendered uneven . 

 by concentric, undulating lines of growth, and the pallial margin is strongly contracted. 



It is a common species in the Meiocene of Virginia, but is very rare in South Carolina. 



Plate XIV., Fig. 11. Exterior of wpper and interior of lower valve. 

 " 12. Side view of fossil. 



Locality. Sumter District. 



. Museum, College of Charleston. 



