. Text-book of embryology. Embryology. CHAP. Ill POEIFERA 41 stitute it become invaginated into the posterior half, and the blasto- coele is thus reduced to a mere slit. The cells forming the edge. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan

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