Hydra

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Hydra are in the Jellyfish family, class Hydrozoa. Cross-section of the body showing the two layers of cells of the body wall.

Keywords

hydra, jellyfish, hydrozoa

Galleries

Jellyfish

Source

David Starr Jordan and Vernon Kellogg,Animal Life: A First Book of Zoology(New York:D. Appleton and Company, 1912) 38

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