. Animal biology. Biology; Zoology; Physiology. Outer germ layer (Ectoderm). Middle germ layer (Mesoderm) " Inner germ layer (Endoderm)xV Blastodermic vesicle later becoming yolk sac Chorion Ectoderm Endoderm Embryo Amniotic fold. Gut of embryo Allantois. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company

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Keywords: ., bookcentury1900, books, booksubjectphysiology, booksubjectzoology