These valves are extremely worn and sand-polished.

It takes a great deal of abrasion to remove the strong, dark, well-adhered periostracum of this species.

A very old valve.

Leaf spot fungus on this Wax Myrtle.

These rows of tiny holes are made by boring bryozoans in an old shell of the Hard Clam.

The few big, more random holes here are made by boring sponges.

Pawprints.