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Chordate morphology. Morphology (Animals); Chordata. embryo. J â 'umbilicus yolk sac Figure 7-19. Amnion and placental development of the pig. A, 1 6 to 1 7-somite embryo and extra- embryonic membranes
Elementary text-book of zoology. Yolk-sac. Embryo. miotic Cavity.. Yolk-sac. A, Stage of tbe Frog witb only small Yolk-sac ; B, Stage of the Skate ; ^, Stage of Developing Amnion ;