Tellina alternata Say, 1822
An Alternate Tellin may reach a length of 3 inches. The shell is oblong with parallel concentric lines, and is usually white. An angular ridge (almost like a soft wrinkle) runs from the beaks to the posterior margin (or edge). The shell has two little teeth in the hinge under the beak.
The mollusk is a bivalve which lives in shallow water. It can burrow far down in the sand because it feeds through a long siphon which it can extend several times the length of its shell. It may dwell from North Carolina to the Gulf of Mexico.