TELLINID^. 47 



TELLINA CAYENNENSIS. 



Plate VIII. Fig. 4. 



Psammobia cayennensis, Lam., An. sans Vert., Vol. 6, p. 177. 



Solen constrictus, Brug., Cat. Mem. de la Soc. d'Hist. Nat., p. 126, No. 3. 



Tellina intastriata, Say, Jour. Acad. Nat. Sci., Vol. 5, p. 218. 



Tellina intastriata, De Kay, Zool. New- York, Art. Mollusca, p. 211. 



Tellina cayennensis, Jay, Cat. Coll. Shells, 4th Ed., No. 536, p. 25. 



Tellina intastriata, Say's Conch. U. S., (Binney,) p. 125. 



Description. Shell sub-ovate, ventricose, transversely and distinctly striated; posterior 

 end wrinkled; radiating striae nearly obsolete externally, within distinct; anterior margin 

 regularly rounded, and continuous with basal margin ; posterior end angular, sub-rostrated, 

 tip rounded, curved to the right; within smooth, not striated ; posterior dorsal slope oblique, 

 rectilinear, with a fold extending from beak to basal margin. 



Tellina cayennensis is living on the coast of South-Carolina, but only found near the 

 mouth of the Santee River, where the water is brackish. 



Plate VIII. Fig. 4, Valves, natural size. 



Museum, College of Charleston; Cabinet F. S. H. 



Genus, T E L L I D O R A . — M 6 r c h. 



TELLIDOEA LUNULATA. 



Plate IX. Figs. 6 to Id. 



Tellidora lunulata, Adams, Gen. Recent Mollusca, Vol. 2, p. 401. 



Description. Shell sub-triangular, inequivalve, inequilateral; surface of valves concen- 

 trically plicated; beaks prominent, slightly curved laterally; lateral slopes strongly 

 produced, dentated at their edges ; two primary teeth in right valve, one in the other ; 

 lateral teeth, two in each valve. 



Tellidora lunulata no longer exists on the coast of South-Carolina ; T. Burnetti, of 

 Brod. & Sow., now living on the Pacific shores of California, is nearly allied to it. In our 

 fossil shell, the left valve is concave, and the right valve flat ; the dorsal anterior slope is 

 almost rectilinear, in some specimens slightly, and convexly curved, and the posterior slope 



