Colony of Pennatula phosphorea
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“Colony of Pennatula phosphorea from the metarachidial aspect. p, The peduncle. B, Section of the rachis bearing a single pinna. A, Axis; b, metarachidial; c, prorachidial; d, pararachidial stem canals.” —Encyclopedia Britannica, 1910
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Corals and Sea AnemoneSource
The Encyclopedia Britannica: Volume 3 (New York, NY: The Encyclopedia Britannica Company, 1910)
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