. The biology of twins (mammals) . Twins. TWINNING IN DASYPUS NOVEMCINCTUS 45 Trager, while the thin-walled part of the trophoblast is known as the diplotrophoblast (dtr). trfl. dtr Fig. 12.â^An armadillo egg (stage V) attached by the Trager to uterus, and shown as if torn away at Tra. The ectoderm (ec) is a hollow vesicle. The apical pole is at X. Endoderm {en) joins diplo- trophoblast {dlr) in a ring (»â ). The trophoderm plate {tr pi) lies within the Trager collar (Tra); ectodermal layer of anmion (ec am); amniotic cavity (o»»c); mesoderm (»»j); much enlarged extra-embryonic cavity (ex
. The biology of twins (mammals) . Twins. TWINNING IN DASYPUS NOVEMCINCTUS 45 Trager, while the thin-walled part of the trophoblast is known as the diplotrophoblast (dtr). trfl. dtr Fig. 12.â^An armadillo egg (stage V) attached by the Trager to uterus, and shown as if torn away at Tra. The ectoderm (ec) is a hollow vesicle. The apical pole is at X. Endoderm {en) joins diplo- trophoblast {dlr) in a ring (»â ). The trophoderm plate {tr pi) lies within the Trager collar (Tra); ectodermal layer of anmion (ec am); amniotic cavity (o»»c); mesoderm (»»j); much enlarged extra-embryonic cavity (ex c). (Modified from Patterson.) Stage V. The period of rapid growth and the estab- lishment of bilaterality (Fig. 12).âDuring the earlier. 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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