T E L L I N I D ^ , 47 



TEL LIN A CAYENNENSIS. 

 Plate VIIL 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. f^tffii^fi 



Tellina intastriata, Saij, Jonr. Acad. Nat. Sci., Vol. 5, p. 218. /9xC. 



Tellina intastriata, DeKay, 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. 



Descriftion. Shell sub-ovate, vientncose, transversely and distinctly striated; posterior 

 end wrinkled; radiating strife nearly obsolete externally, within distinct; anterior maro-in 

 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, TELLIDORA. — M5rch. 



TELLIDORA 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 iu 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 



