Ctenoid, Scale
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Fishes are sometimes classed, in accordance with the structure of their scale, into Ctenoid, Ganoid, Cycloid, and Placoid. This is an illustration of a Ctenoid Scale of the Perch.
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Fish AnatomySource
Logan Marshall, Ed. International Self-Pronouncing Reference Library (five vols.) (Philadelphia, PA: International Press, 1911)
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