. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. Fig. 127. Pionaspis planicosta, restoration of dorsal shield based on type (X 1). A, dorsal view; B, lateral view of left side. bro, branchial opening; orb, orbit; pbl, postbranchial lobe; ro, 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. Chi
. The Cyathaspididae; a family of Silurian and Devonian jawless vertebrates. Cyathaspididae. Fig. 127. Pionaspis planicosta, restoration of dorsal shield based on type (X 1). A, dorsal view; B, lateral view of left side. bro, branchial opening; orb, orbit; pbl, postbranchial lobe; ro, 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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