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Smallish, oval shaped. Gray dorsum (back), pale underneath. Recently moulted specimens are pale, sometimes pinkish. These crabs do not have pincer claws and are filter feeders. They live in the sand at the shoreline and can be found burrowing under the sand when waves pass over them.
This one was found deceased on the beach. I was surprised that the gulls hadn't found it yet. I used to catch these little guys all the time when I was a kid. We used to call them "sand diggers". Additional reference, though not much info: http://bugguide.net/node/view/603686