Aggregating anemone (also called colonial anemone) found on the rocky shore.

Inside a cave on the same shore, there were more of this species which were nearly white (very light shades yellow and pink), as they did not have algae in them (because the cave lacked light necessary for photosynthesis). I did not take my camera into the cave (too much risk of it becoming wet), so I was unable to take a photograph.

Monterey Bay Aquarium's entry on this species: http://www.montereybayaquarium.org/animals/AnimalDetails.aspx?enc=VsGX+Lst7QaKTaPiIgckew==