18 PLEIOCENE FOSSILS. 



OKBICULA MULTILINEATA.— Con. 



Orbicula multilineata, Con., Foss. Ter. For., Plate LXXV., Fig. 3. 



0. testa, orbiculata ; vaha sujperiore, radiatim tenuistriata, lamellosa, vertice sub-centrali. 



Description. Shell, orbicular ; superior valve, with fine radiating lines, apex sub-central. 



This species is separated from the preceding by the radiating lines, and by having the 

 apex nearly central. Even in young specimens of 0. lugubris the apex is marginal, as 

 represented in Plate V., Fig. 3. The Eocene is the lowest formation in which the genus 



ORBICULA OCCUrS. 



Plate V., Fig. 2. Fossil, natural size. 



Locality. Dr. Davis's, Pee Dee River. 



Museum, College of Charleston. 



LAMELLIBRANCHIATA.-BLAINVILLE. 



ACEPHALA.— Cuv. 

 CONCHIFERA.— Lam. 

 PLEURC-CONCim— D'Obbigny. 



Fam.— ANOMIDJE. 



ANOMIA.— Linn. 

 ANOMIA EPHIPPIUM.— Linn. 



Plate Y., Figs. 4 and 5, 



Anomia ephippiurn, Linn., Syst. ISTat. 1150. 



A. testa suborbiculari, irregulari, tenuissima ; concentrice striata, sub-laivigata : for amine 

 ovato. 



Description. Shell somewhat orbicular, irregular, undulating ; concentrically striated, 

 or smooth ; opening for the byssus large, oval. 



