The primitive enteron or undifferentiated digestive sac of a gastrula or other embryo. See Illust. under Invagination.
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Hollowness.
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The pore or opening leading into the cavity of invagination, or archenteron.
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An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giv…
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