Amazingly, although this appears to be a single jellyfish-like animal, it is in fact a roving colony made up of thousands of individual organisms, called zooids, each contributing to the whole. However, more than just its otherworldly shape, this specimen's purple coloring is said to be rather unusual as well.
http://www.iflscience.com/deep-sea-explorers-stumble-upon-creature-they-can-hardly-believe-real