Aurelita aurita
The moon jelly differs from many jellyfish in that they lack long, potent stinging tentacles. Instead they have hundreds of short, fine tentacles that line the bell margin. The sting has no effect on humans.
Great “Deep Look” video showing jelly life cycle
More “Deep Look”
A lot more than jellyfish, 44 minutes, but look at 34:00 plus: large number of polyps starting to free ephyra
Shape of Life, moon jelly life cycle