. Chordate morphology. Morphology (Animals); Chordata. 'oIk nuclei blast stopore blastopore epiblost segmentation cavity periblast and hypoblast. hypoblast (mesentoderm) epiblost mesoderm free area limit of mesoderm. 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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