. The biology of twins (mammals). Twins. TWINNING IN DASYPUS NOVEMCINCTUS 37 majority of eutherian mammals. I am strongly inclined to predict that when the cleavage is made known it will prove to be much Hke that of Dasyurus. This prediction rests on two circumstances: first, that the history of the ova of Dasyurus and that of Dasypus are alike as far as we can trace them, and that the latter is unlike. Fig. 7.—A fertilized armadillo egg with two polar bodies and the male and female pronuclei side by side. that of other species of EutJieria; second, that the arrangements of embryos in pairs an
. The biology of twins (mammals). Twins. TWINNING IN DASYPUS NOVEMCINCTUS 37 majority of eutherian mammals. I am strongly inclined to predict that when the cleavage is made known it will prove to be much Hke that of Dasyurus. This prediction rests on two circumstances: first, that the history of the ova of Dasyurus and that of Dasypus are alike as far as we can trace them, and that the latter is unlike. Fig. 7.—A fertilized armadillo egg with two polar bodies and the male and female pronuclei side by side. that of other species of EutJieria; second, that the arrangements of embryos in pairs and the mirror- imaging effects that are so striking a feature of the quadruplets are much more in accord with a type of cleavage in which the blastomeres retain a regular and definite position than with one in which the cleavage cells shift 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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