68 PLEIOCENE F0.SS1LS. 



This is a well-marked species. On the anal side, the ribs are rounded, and two or three 

 on the angle are robust, squamose, and imbricated. The middle ribs are flat, with an 

 impressed line; and the angles crenulated. On the buccal side, the ribs are rounded and 

 closely crenulated by the lines of growth. 



b 

 Plate XIX. Fig. t», Interior of right and exterior of left valve. 



Locality. Waccamaw. 



Museum, College of Charleston. 



C AUDI T A P E R J' L A N A . 

 Plate- XIX. Fig. 11. 



Cardita perplana, Con., Am. Jour. Sci., Vol. 41, pi. 2, fig. 16. 

 Astarte radians, Con., Foss. Ter. For., p. 77, pi. 43, fig. 13. 



C. testa trigona, inequilaterali, plana, radiatim costata, concentrice striata; umbonibus 

 acutis; latere anali elongato; latere buccali brevi. 



Description. Shell triangular, inecpiilateral, radiately ribbed, concentrically striated; 

 umbones, anal side produced, buccal side short, 



A few prominent lines of growth often mark the disks, and the ribs on the anal side are 

 curved. The ribs are few and not closely arranged. The straight buccal margin, and 

 very flat form, separate this fossil from every other species of the genus. 



Plate XIX. Fig. 11, Natural size. 



Locality. Waccamaw. 



Museum, College of Charleston. 



