Section through ovum imbedded in the uterine decidua. Semidiagrammatic. - - am. Amniotic cavity. - b.c. Blood-clot. - b.s. Body-stalk. - ect. Embryonic ectoderm. - ent. Entoderm. - mes. Mesoderm. - m.v. Maternal vessels. - tr. Trophoblast. - u.e. Uterine epithelium. - u.g. Uterine glands. - y.s. Yolk-sac.

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