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Examples
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The lower or ventral segments, the hyposomites, corresponding to the lateral plates of the craniote-embryo, fuse together in the upper part owing to the disappearance of their lateral walls, and thus form the later body-cavity (metacoel); in the lower part they remain separate, and afterwards form the segmental gonads.
The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876
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But the partitions of the large ventral pieces (gonotomes) become thinner, and afterwards disappear in part, so that their cavities run together to form the metacoel, or the simple permanent body-cavity.
The Evolution of Man — Volume 1 Ernst Heinrich Philipp August Haeckel 1876
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