I was sometimes thrown off by the bold radiating ridges on some of these small oysters but I think they are all just young Easterns.
Miscellaneous pieces of oysters were fairly common in the tidal drift piles on the outer beaches. I believe these are small, relatively intact examples.
Perhaps Crassostrea virginica, the Eastern oyster? Volusia county, Florida; 08 June 2015.
Single specimen collected on sand flats.
The eastern oyster (Crassostrea virginica) — also called Atlantic oyster or Virginia oyster — is a species of true oyster native to the eastern seaboard and Gulf of Mexico coast of North America. It is also farmed in Puget Sound, Washington, where it is known as the Totten Inlet Virginica. Eastern oysters are and have been very popular commercially. Today, less than 1% of the original 17th century population (when the original colonists arrived) is thought...