On a snorkeling trip in Martinique I ran across this moon jellyfish (Aurelia aurita). It is also called the moon jelly, common jellyfish, or saucer jelly. It is translucent, usually about 25–40 cm 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, so it was easy to follow and photograph.