. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. pm ro soc mxb m0. orb cd, mdl ldl cd4 ds drs. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Denison, Robert H. (Robert Howland), 1911-1985; Chicago Natural History Museum. Chicago : Chicago Natural History Museum Press

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