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Updated: May 24, 2025
These changes show that certain gentes in some of the tribes have become extinct through the vicissitudes of time, and that others have been formed by the segmentation of over full gentes.
In the unarticulated stem-forms of the Chordonia, which we have called the Prochordonia, the two coelom-pouches, and therefore also the muscle-plates of their walls, were not yet segmented. This segmentation of the muscles was the momentous historical process with which vertebration, and the development of the vertebrate stem, began.
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