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Jellyfish are saucer-shaped and can be a foot or more in diameter. They are gelatinous and semitransparent.

Jellyfish

Jellyfish are saucer-shaped and can be a foot or more in diameter. They are gelatinous and semitransparent.

A large jellyfish.

Jellyfish

A large jellyfish.

Portuguese Man of War floating above the surface of the water.

Portuguese Man of War

Portuguese Man of War floating above the surface of the water.

The man-of-war bird (also known as the frigate-bird or frigate-pelican) is noted for its extraordinary powers of flight.

Man-of-War Bird

The man-of-war bird (also known as the frigate-bird or frigate-pelican) is noted for its extraordinary…

The Portugures man-of-war has a bladderlike float, and locomotion depends upon the wind and current. they have well-developed stinging cells.

Portuguese Man-of-War

The Portugures man-of-war has a bladderlike float, and locomotion depends upon the wind and current.…

"Physalia, the Portuguese Man-of-war." — Galloway

Physalia

"Physalia, the Portuguese Man-of-war." — Galloway

American steamship being chased by Spanish man-of-war.

The Spanish Man-of-War Tornado Chasing the American Steamer "Virginius"

American steamship being chased by Spanish man-of-war.