VENERIDiSE. 37 



Genus, DOSINIA.— Scopoli. 



DOSINIA CONCENTEICA. 



Plate VII. Fig. 4. 



Venus concentrica, Gmel, p. 3286, No. 82. 



Venus concentrica, Dillwyn's Catalogue, Vol. 1, p. 196. 



Venus concentrica, Tuomey $ Holmes, Pleiocene Foss. So. Ca., p. 82, pi. 21, fig. 7. 



Artemis concentrica, Born., Sow. Gen.,- fig. 4. 



Artemis concentrica, Conrad, Amn. Marine Conch., p. 55. 



Artemis concentrica, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xxi. 



Cytherea concentrica, Lam., Vol. 6, p. 316. 



Dosinia concentrica, Adams, Gen. Recent Shells, Vol. 2, p. 431. 



Description. Shell sub-orbicular, depressed, almost equilateral, concentrically striated; 

 striae equal, closely arranged, distinct; lunule sub-cordate; ligament sunk ; margins even; 

 muscular impressions large; pallial sinus angular, ascending; dorsal cleft for hinge 

 lanceolate and gaping. 



Dosinia concentrica is one of the most common recent shells of the Southern coast, 

 and abundant in the Post-Pleiocene. 



Plate VII. Fig. 4, Natural size. 



Locality. Simmons'. Museum, College of Charleston; Cabinet F. S. H. 



Genus, TAPES. — Muhlfeldt. 



TAPES G R U S . — ( New Species.) 

 Plate VII. Fig. 5. 



Description. Shell small, convex, transversely oblong, sub-rhomboidal, inequilateral, 

 with twenty -five or twenty-six ribs; ribs radiating, and interrupted by distinct over- 

 lapping zones of increase, which give the shell a laminated, or squamose appearance ; 

 umbones, anterior; dorsal margin thick, rectilinear, or very slightly curved, without ribs, 

 squamose ; posterior margin sub-truncated, anterior margin shorter, regularly rounded ; 

 pallial margin crenated ; pallial sinus deep ; muscular impressions large. 

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