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extra embryonic membranes : amnion chorion allantois and yolk sac ...…
Elementary text-book of zoology. 496 CHORD AT A. Fig. 340. —Diagram of Phascolarctos {Koala) Embryo and ITS Fcetal Membranes. (Modified from Semon). Yolk-sac. Allantoic. Yolk-sac. Amnion. Embryo.. Prokalymma. Note the yolk-sac