p.3

Cumingia tellinoides, Conrad, Jour. Acad. Nat. Sc. v 6 p 258 & vol 7 p 234; Gould, Inv. of Mass. p. 56 fig. 36. DeKay, Nat. Hist. of N.Y. p. 233; Mactra tellinoides, Con. Jour. Acad. Nat. Sc. vol. 6 p. 258 pl. 11 figs. 2 & 3; Am. Mar. Conch. pl. 14 fig. 2; Russel, Essex Jour. Nat. Hist. Vol. 1 p. 53.

Shell small, thin, fragile, ovate-triangular, nearly equilateral, inflated, broad in front, compressed behind, warped, ending in a rounded point; beaks raised, with a small well defined area in front; surface with concentric incremented lines, which are sharp and elevated, and crossed by microscopic radiations [elevations]; in front of the cartilage pit in each valve is a linear tooth, forming part of its wall, and at its side a pit for the reception of the corresponding tooth; lateral teeth distinct in the right valve, but wanting in the left; the anterior one longest. Palleal impression far within the shell, with a broad deep sinus.

L. 0.6 H 0.45