"Fluther of Jellyfish"
"School of Jellyfish"
"Smack of Jellyfish"
"Swarm of Jellyfish"
Jellyfish or jellies are softbodied, free-swimming aquatic animals with a gelatinous umbrella-shaped bell and trailing tentacles.
The bell can pulsate to acquire propulsion and locomotion.
The tentacles may be utilized to capture prey or defend against predators by emitting toxins in a painful sting.