That type of scallop is not native here. They are plentuful south of Cape Cod on the US Eastern Seaboard. I did find a personal web page about diving for scallops in Florida and they look a lot like those in your picture. Scallops here are much bigger. The meat alone is the size of those shells. Gulf of Maine scallops can get to 10 inches in diameter.
Divers are required to land scallops in accordance to the same law as draggers. When I went diving for scallops, we went out to a spot where a power cable lies between two islands. The nautical chart depicts a 50 yard area that is prohibited to draggers. Great spot to dive for scallops! Upon surfacing, we shuck (open and clean) each scallop and make sure there is nothing else but the allowed meats on board. If we have a particularly huge shell ("platter"), we'll keep it as a souvenir at no consequence.





















