. Chordate morphology. Morphology (Animals); Chordata. BIRKENIA. PTERASPIS Figure 5-29. Lateral views of reconstructions of fossil ognaths: A, osteostracan, B, anospid, and C, heterostrocan. (Partly after Stensio, Jorvik, and Romer) 134 • THE HEAD SKELETON OF FISHES. 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 Jollie, Malcolm. New York, Reinhold

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