. The biology of twins (mammals). Twins. TWINNING IN DASYPUS NOVEMCINCTUS 47 that the embryo though inside out is clearly polarized and bilateral and that it is still one embryo. A further evidence of bilaterality is seen in the mesoderm {ms) Tra. Fig. 13.—An armadillo egg showing first division into a double individual. The two first embryos (II and IV) are shown as right and left outgrowths of the ectodermic vesicle. (For details see description under stage VI. Lettering as in Fig. 12,) (Modified from Patterson.) which is proliferating at two bilateral points where the ectoderm and the endod

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. The biology of twins (mammals). Twins. TWINNING IN DASYPUS NOVEMCINCTUS 47 that the embryo though inside out is clearly polarized and bilateral and that it is still one embryo. A further evidence of bilaterality is seen in the mesoderm {ms) Tra. Fig. 13.—An armadillo egg showing first division into a double individual. The two first embryos (II and IV) are shown as right and left outgrowths of the ectodermic vesicle. (For details see description under stage VI. Lettering as in Fig. 12,) (Modified from Patterson.) which is proliferating at two bilateral points where the ectoderm and the endoderm part company. Stage VI. The first step in twinning—tlie primary embryos (Fig. 13).—The ectodermic vesicle, which was. 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 Newman, Horatio Hackett, b. 1875. Chicago, Ill. , University of Chicago press

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Keywords: ., bookpublisherchicagoilluniversityofchicagopress, bookyear1917