. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 128 T. H. MORGAN. the dorsal lip of the blastopore lies. At the same time the lateral wall of the blastocoel has been reduced in thickness, and there can be little doubt that the reduction must be directly due to the movement downwards of its cells. On the opposite side of the section where the ventral lip will form later the down- growth of small cells is less marked, and the lateral wall of the blastocuel is correspondingly thicker. In other words, the ring of embryo-forming material lies at this time obliquely on the egg
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 128 T. H. MORGAN. the dorsal lip of the blastopore lies. At the same time the lateral wall of the blastocoel has been reduced in thickness, and there can be little doubt that the reduction must be directly due to the movement downwards of its cells. On the opposite side of the section where the ventral lip will form later the down- growth of small cells is less marked, and the lateral wall of the blastocuel is correspondingly thicker. In other words, the ring of embryo-forming material lies at this time obliquely on the egg one side having pushed down further than the other. On the right and left sides of the embryo, as seen when cross-sections are made, the ring shows all intermediate stages between the o o condition at the dorsal and at the ventral 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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