Moon jellyfish

Description:

The jellyfish is translucent, usually about 25–40 cm (10–16 in) in diameter, and can be recognized by its four horseshoe-shaped gonads, easily seen through the top of the bell. It feeds by collecting medusae, plankton, and mollusks with its tentacles, and bringing them into its body for digestion. It is capable of only limited motion, and drifts with the current, even when swimming

Habitat:

The genus Aurelia is found throughout most of the world's oceans. These are in the Auquarium of the Bay, SF.