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"Diagram of a colony of dicoryne, showing three forms of persons. a, normal hydriform person; b, modified bud-bearing hydriform person (blastostyle); c, degenerate medusiform persons (sporosacs)." — Encyclopedia Britannica, 1893

Dicoryne

"Diagram of a colony of dicoryne, showing three forms of persons. a, normal hydriform person; b, modified…

"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

Hydractinia

"Diagram of a colony of Hydractinia, showing four forms of persons. a, hydriform person; b, modified…