Purple-Striped Jelly (Chrysaora colorata)
Also known as the purple-striped sea nettle or the mauve stinger, the purple-striped jelly is a species of pelagiid jellyfish that is endemic to waters off the coasts of California. Like other jellyfish C. colorata is pelagic and will feed on a variety of invertebrates that are dispatched via its stinging nematocysts. Occasionally young crabs of the genus Cancer will make their homes in the jellyfish and will eat parasites that attempt to feed on the jelly.
Other person: some more words