. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. Fig. 138. Americaspis americana, slab of Landisburg sandstone from near Andersonburg, Pennsylvania, with impressions of numerous shields; CNHM, PF3321 (X 1/4).. 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 Pres
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. Fig. 138. Americaspis americana, slab of Landisburg sandstone from near Andersonburg, Pennsylvania, with impressions of numerous shields; CNHM, PF3321 (X 1/4).. 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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