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This becomes at last a great hollow sac, which is applied closely to the porous shell, and the extent of which will be appreciated by looking at Figure 5, Sheet 24, where the allantois is shaded.— Text Book of Biology, Part 1: Vertebrata
Blood is taken out to the allantois, however, by the arteries of the latter type Section 32.— Text Book of Biology, Part 1: Vertebrata
The structure thus formed by the union of the wall of the maternal uterus, allantois, and the intermediate structures is called the placenta.— Text Book of Biology, Part 1: Vertebrata
Note particularly how the allantois (al.)— Text Book of Biology, Part 1: Vertebrata
The phenomenon was easily accounted for; it was taken for granted that a small black thread had been attached to the allantois, that the thread passed through the ceiling, and that some one in the apartment above, by pulling the thread, elevated it to the ceiling, and kept it in its position!— Up in the Clouds Balloon Voyages
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