Body-wall

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“Portion of the body-wall of Hydra, showing ectoderm cells above, separated by “structureless lamelia” from three flagellate endoderm cells below. The latter are vacnolated, and contain each a nucleus and several dark granules. In the middle ectoderm cell are seen a nucleus and three nematocysts, with trigger hairs projecting beyond the cuticle. A large nematocyst with everted thread, is seen in the right-hand ectodermal cell.” — Encyclopedia Britannica, 1893

Source

The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)

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