We found them trying to dig in dry sand. We ended up letting them go back into the ocean.
Thanks to Till Deuss and Arthur Anker for ID
Dead. About 1/2".
in sand; "Pacific mole crab"
Emerita analoga, the Pacific sand crab or Pacific mole crab, is a species of small, sand-burrowing decapod crustacean found living in the sand along the temperate western coasts of America. It is found on exposed sandy beaches in the swash region of the intertidal zone.