296 NOKTH-CAKOLINA GEOLOGICAL 6UKVEY. 



Shell sub-orbicular, depressed, sub-equilateral, concentrical- 

 ly striate ; broader than long ; lumule small, lines of growth 

 or concentric striae regular, simple, and somewhat coarse and 

 distant. Fig. 224 shows the hinge. 



FIG. 224. 



This fossil appears to differ from the Artimus concentrica 

 of the coast ; its linus of growth are about half as numerous 

 and are also continuous from one margin to the other, except- 

 ing a few on the anterior margin, 



In the living coast species the lines of growth are less 

 regular, and coalescent near both margins ; it is orbicular 

 also, being as long as wide. The fossil, however, closely re- 

 sembles the living one of the coast, though it differs as much 

 from it as Artemis acetalubum of Conrard. 



Species which belong to the miocene and which remain 

 undescribed : A. acetabulum, A. concentrica. 



FAMILY TELLIMIDAE. TELLINA BIPLICATA. CON. (Fig. 225.) 



Shell rather large, thin, sub-oval, inequivalve, sub-ventri- 

 cose, marked with rather obscure radiating lines, and impress- 

 ed with an oblique fold in each valve. The remaining spe- 

 cies of Tellina belonging to the miocene are T. Alternata, T. 

 Polita, and T. Flexuosa. 



