Order: Sorbeoconcha (Neotaenioglossa)
The Violet Snail, Janthina, with its float of mucus bubbles floating alongside the siphonophore Physalia on which it feeds.
Often washed up on beaches as empty shells, Violet Snails spend their lives floating at the surface of the open ocean, feeding on the Bluebottle Physalia, and related cnidarians. It floats by producing a mass of mucous bubbles which harden into a bubbleplastic-like float.
I suppose there are far worse ways to spend one’s days.