. The biology of twins (mammals) . Twins. 8o THE BIOLOGY OF TWINS corpus luteum as a means of distinguishing between multiple births and polyembryony should omit to furnish this Fig. 33 Fig. 34 Figs. 33 and 34.—^Two stages in the development of the egg of the armadillo Euphractus (Dasypus) villesus (from Fernandez), showing how each of the individuals shown in Fig. 32 appears before they fuse membranes. In Fig. 33 the single embryo has formed at the lower pole, as in Dasypus (cf. Figs. 13 and 14), but only one primitive streak arises. In Fig. 34 the single embryo has grown backwa
. The biology of twins (mammals) . Twins. 8o THE BIOLOGY OF TWINS corpus luteum as a means of distinguishing between multiple births and polyembryony should omit to furnish this Fig. 33 Fig. 34 Figs. 33 and 34.—^Two stages in the development of the egg of the armadillo Euphractus (Dasypus) villesus (from Fernandez), showing how each of the individuals shown in Fig. 32 appears before they fuse membranes. In Fig. 33 the single embryo has formed at the lower pole, as in Dasypus (cf. Figs. 13 and 14), but only one primitive streak arises. In Fig. 34 the single embryo has grown backward, as in Dasypus, to the upper pole, where placentation has occurred. The Peludo shows us typical armadillo development unobscured by polyembryonic processes, and on that account should throw light on the mechanics of poly- embryony. A comparison of the earHest known stages of the development of the Peludo and those in Dasypus may be made by examining the diagram of Fernandez. 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. : The University of Chicago Press
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