The hermit crab was moving around the rocks on the tidepools. It's mostly black with a blue stripe on each foot/claw.
This guy found a nice food source in this dead abalone!
Pagurus samuelis, the blueband hermit crab, is a species of hermit crab from the west coast of North America, and the most common hermit crab in California. It is a small species, with distinctive blue bands on its legs. It prefers to live in the shell of the black turban snail, and is a nocturnal scavenger of algae and carrion.