The jelly fish is the popular name of several different animals found in the sea and so called because of the transparent, jelly-like substance constituting most of the body. They are often called sea blubbers or sea nettles, from their shape or their long stringing tentacles, with which they seize their prey. In the water they move rapidly and present a singularly-beautiful appearance. One of the most common forms is a bell-like body which swims gracefully through the water by alternately expanding and contracting. The animals are sometimes cast up on sea beaches, but out of the water they lose their beauty and have the appearance of formless masses of jelly.
