. Chordate morphology. Morphology (Animals); Chordata. hypoblast (mesentoderm) epiblost mesoderm free area limit of mesoderm. ^^ hypoblast (mesentoderm) prechordal plate (mesentoderm) otocho blastopore archenteron ^periblast overlying yolk prechordal plate (mesentoderm) inner ring sinus (arterial). 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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