Scrippsia pacifica

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Baja California to northern California.
Surface to deep water.
Up to 100 mm bell diameter, as adults.
Useful Facts or Characters: 

Has a deep bell-shaped umbrella bearing about 256 tentacles in 7 cycles.

Natural History: 

This species closely resembles Polyorchis penicillatus, although it can reach a larger size.  Commonly called the giant bell jelly.