This is the velella (Velella Velella), a small free floating hydrozoan. It’s currently the only known species in the genus. They’re also known as sea-rafts or by-the-wind-sailors, for the obvious reason that it uses the “sail” for locomotion.
The coolest thing about this guy is his name PINK SEE-THROUGH FANTASIA (Enypniastes eximia) — rhamphotheca: “ seafwends:species, anyone? what is this lil guy? * A transparent sea cucumber, found at meters in the Northern Gulf of Mexico.
Atolla Jellyfish: wyvillei, also known as Atolla jellyfish or Coronate medusa, is a species of deep-sea crown jellyfish. It lives in oceans around the world. Like many species of mid-water animals, it is deep red in color -
The aptly named Ping-pong tree sponge (Chondrocladia lampadiglobus) is a carnivorous sponge. Those ping-pong ball looking things are covered in tiny spicules which the sponge uses to catch tiny crustaceans.
i didn't type this: Rare Glowing Flower Hat Jellyfish (Osaka Aquarium, Japan.) When it's not using its long, pink tipped tentacles, it will curl them upwards towards its pin-striped bell to sit and wait until some kind of prey comes along.