True Jellyfish (Class Scyphozoa) > 獅鬃水母 Lion's Mane Jellyfish or Cyanea capillata
It had a spider crab inside of it
I found these two dead jelly fish in the chamache marina.
Washed up jellyfish
These cannonball jelly fish are common in the Matanzas river. They are heavy and smooth and often live with a spider crab