19mm total length. Found in sandy intertidal. Photo scanned from 35mm slide.
San Diego County, California, US
sandy beach, looks like a burrower
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.