64 PLEIOCENE FOSSILS. 



CARDIUM MUKIOATUM. — Linn. 



Plate XIX. Fig. 2. 



Cardium muricatum, Linn., Sys. Nat., p. 1123. 



C. testa cordata-ovata, suh-obliqua, radiatim costata; costis convexis, tuberculis minutis 

 compressis. 



Description. Shell cordately ovate, somewhat oblique, radiately ribbed, ribs convex, 

 muricated with minute compressed obliquely arranged tubercles. 



The muricated ribs serve to distinguish this from the other Tertiary species which 



it may resemble. On the buccal side of the shell, the ribs have the tubercles on the 



anterior side; these are followed by a few ribs muricated on both sides; and on the 

 anal side the tubercles are turned backward. 



C. muricatum occurs sparingly on the coast of South-Carolina, and living specimens 

 are rarely found; nor is it more abundant amongst the fossil forms of the State. 



Plate XIX. Fig. 2, Interior of right and exterior of left valve, natural size. 



Locality. Darlington District. 



Museum, College of Charleston. 



CARDIUM SUBLINEAT U M . — Con. 



Plate XIX. Fig. 3. 



Cardium sublineatum, Con., Am. Jour. Sci., Vol. 41, p. 347, pi. 2, fig. 13. 

 Cardium sublineatum, Con., Foss. Ter. For., p. 66, pi. 37, fig. 4. 



C. testa obliqua ovata, tenui, sub-ventricosa, radiatim tenuissime striata; marginibus intus 

 crenulatis. 



