This lab photo highlights the bumps that give S. ventana its common name, "bumpy." Each one contains hundreds of stinging cells, used for capturing and holding on to prey.

A. grimaldii is a narcomedusa, typically found at depths of 1,000 meters or more. Very little is known about this beautiful jellyfish.

Photographed about 1000 meters below the surface of Monterey Bay

To humans, this ctenophore is a beautiful light show. To tiny sea animals it's a predator with long, stinging tentacles.

Not an alien spacecraft but a deepwater jelly in Monterey Bay.

Medusa jellies are shaped like disks or bells, with a fringe of stinging tentacles. Most range from 1 to 16 inches in diameter.

The genus Praya probably contains the longest animals in the world; their tails or "stems" can grow up to 50 meters. They are very abundant at times and are top predators in some midwater food chains.

A fairly common midwater jelly, sometimes a dominant predator in the middle depths (200-400 meters) of Monterey Bay.

This Solmissus jelly is swimming in hunting position, with its tentacles extended in front of its bell.