Not really sure, but I donn't see what else it could be.
Chincoteague NWR, VA April 4, 2015
Large rounded shell, narrow mantle opening.
Work on shell. Found on natural shoreline
Solitary, other scallops seen around the dock
Scallop found on the underside of the dock at Roche Harbor. Unsure if species.
Roche Harbor marina
About 3in wide. Found under the dock at Roche Harbor
Side of dock, ~9 cm