I think these are the ones called the Purple Striped Jelly but please correct me if I am wrong. You can see that I am mesmerized by them. Stare at them long enough and you feel yourself being hypnotized. These are Gregg's photos.
A group of jellyfish is often called a smack. Many species of jellyfish are also capable of congregating into large swarms or blooms consisting of hundreds or even thousands of individuals. The formation of these blooms is a complex process that depends on ocean currents, nutrients, temperature and oxygen content.
Or this one but they were fascinating. Usually I try to remember to take pictures of the identification signs but I couldn't find any in my folder.
Here's a short video of the Purple Striped Jelly.
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