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Aquatic organisms: a hydra and a philodina. Chromolithograph by H.J. Ruprecht, 1877.

Nature's enigma : the problem of the polyp in the letters of Bonnet, Trembley and Réaumur / Virginia P. Dawson.

Über den Bau und die Entwicklung von Cordylophora lacustris (Allman) : nebst Bemerkungen über vorkommen und Lebensweise dieses Thieres / von Franz Eilhard Schulze.

The cell biology of hydra / by Thomas L. Lentz.

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Hydra

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Nature's enigma : the problem of the polyp in the letters of Bonnet, Trembley and Réaumur / Virginia P. Dawson.

Über den Bau und die Entwicklung von Cordylophora lacustris (Allman) : nebst Bemerkungen über vorkommen und Lebensweise dieses Thieres / von Franz Eilhard Schulze.

The cell biology of hydra / by Thomas L. Lentz.

Aquatic organisms: a hydra and a philodina. Chromolithograph by H.J. Ruprecht, 1877.