Hydractinia
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“Diagram of a colony of Hydractinia, showing four forms of persons. a, hydriform person; b, modified hydriform person, or blastostyle, bearing c, degenerate medusiform persons or sporosacs; d, modified hydriform person situated at the margin of the colony (dactylozooid).” — Encyclopedia Britannica, 1893
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Corals and Sea AnemoneSource
The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)
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