Another fascinating and informative blog entry. I knew that jellyfish had stings and some types could be dangerous to humans but most of what you wrote was new to me. When I visited the London Aquarium they had a tank full of jellyfish some very plain and others with beautiful long lace-like tendrils which flowed behind then as they pulsated and moved gracefully around, no two were exactly alike.
The photos you took of them are really good.