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Examples
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In all, _d_, indicates the intestinal cavity; _o_, the primitive mouth; _s_, the cleavage-cavity; _i_, the endoderm, or intestinal layer; _e_, the ectoderm or skin-layer.] [Illustration: FIG.
Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions George John Romanes 1871
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