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This species of jellyfish is distinctive for the "crown" that it has above its bell. (To me it looked like a brain.) It's also known as Cauliflower Jellyfish because its eight curly-looking oral arms resemble cauliflower heads.
Most of the time, this species is oceanic, but has been known to drift inshore (as in the case of this spotting). According to EOL, it is "broadly distributed in waters from the mid-Pacific through the Indo-Pacific to the Red Sea, and in the Atlantic off West Africa."
Spotted this graceful jellyfish in about 15m of water at the Angel's Cove dive site, Talikud Island, Philippines. It was slowly swimming towards the surface. It measured about half a meter in diameter and about a meter or so in length.