This is one more crazy looking jellyfish!
There are a few jellyfish in the genus Cephea that look like this, including one called Cephea cephea - so good they named it twice. They are sometimes called Crown Jellyfish, which may cause some confusion with the completely unrelated Crown Jellyfish like the Atollas.
If they do have a crown, it's an incredibly odd one. It's purple! With knobs on! It looks like one of those EEG hats they use to read people's brain waves (not, alas, the epitome of fine literature in this case). Also it reaches about 10 cm (4 in) across.
Then there's the thin frill used for swimming. Underneath all that are the cauliflower-like oral arms plus some extra long tentacles trailing behind. These are all covered in stinging cells for capturing prey, and the fluffy oral arms have a large surface area to make sure nothing gets away.
It ends up looking like a strange mish-mash of sundry body parts. This jelly might fall in the more eclectic style category.
What's with the jellyfish? The dWeb Guide logo is a jellyfish because they have no central nervous system: the perfect symbol of a decentralised system.