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Updated: September 20, 2025
But the calf has in its upper jaw some rudiments of teeth which never are developed, and never play the part of teeth at all. The whalebone whale, again, has horny "whalebone" plates in its mouth, and no teeth; but the young foetal whale before it is born has teeth in its jaws; they, however, are never used, and they never come to anything.
Lower Eocene Foetal: 6th month, that of a ruminant; Miocene Foetal: 7th month, that of a digitigrade animal; Miocene Miocene Pliocene Pliocene Scale: VERTEBRATA Mammalia: 57 Cheiroptera Rocks: 11. Pliocene Pliocene Foetal: 8th month, that of the quadrumana; Superficial deposits Foetal: 9th month, attains full human character;
It is evident, therefore, that in rabbits, whatever influence the corpora lutea may have in the first half of pregnancy, they have none in the second half, and that at this period the essential hormone proceeds from the developing foetus or foetal placenta.
We may, therefore, conclude that the ontogenetic blastula is the reproduction of a very early phylogenetic ancestral form, and that all the Metazoa are descended from a common stem-form, which was in the main constructed like the blastula. In many of the lower animals the blastula is not developed within the foetal membranes, but in the open water.
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