. Chordate morphology. Morphology (Animals); Chordata. KupfFer's vesicle periblast D BEGINNING OF GASTRULATION embryo E STAGE 13 TROUT ^ LONGl SECTION STAGE 13 TROUT blastopore' germinal rin. neural keel neural keel eye germinal ring. 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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