. Breviora. 28 BREVIORA No. 473. Casea Varanops Aerosaurus Ophiacodon Edaphosaurus Dimetrodon Sphenocodon. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. , Museum of Comparative Zoology, Harvard University

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