Velella Velella, Jellyfish-Like Creatures washed ashore in Southern California. Huntington Beach, CA

Blue jelly-like creatures washing up on shore in Huntington Beach and the South Bay. Though they're more commonly known as by-the-wind sailors because of their sail-like tops, their scientific name is Velella Velella. They feed on plankton and algae and their main predator is a sunfish called Mola.
Though they're not exactly jellyfish, they are related to them.