. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ORGANS IN THE EMBRYO OF THE FOWL. I I I the embryo, but towards the dorsal surface ; the flexures were normal. The striking thing was the apparent entire absence of the amnion ; the embryo lay naked on the surface of the blasto- derm, to which it was attached, in the same manner as a selachian embryo by a very broad somatic and splanchnic umbilicus. In the normal embryo of this age the amnion is completely closed, and the body-wall of the embryo has, therefore, lost all connection with the FIG. II. Experiment 36. O
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ORGANS IN THE EMBRYO OF THE FOWL. I I I the embryo, but towards the dorsal surface ; the flexures were normal. The striking thing was the apparent entire absence of the amnion ; the embryo lay naked on the surface of the blasto- derm, to which it was attached, in the same manner as a selachian embryo by a very broad somatic and splanchnic umbilicus. In the normal embryo of this age the amnion is completely closed, and the body-wall of the embryo has, therefore, lost all connection with the FIG. II. Experiment 36. Operation diagram. Outline of embryo of chick of about 46 hours, after Duval. The ruled area shows the site of the operation with the heated needle. For description of the operation see text. This embryo was cut into 625 transverse sections. These confirm the general absence of the amnion, and at the same time furnish additional data. Back to about the 354th section (forty sections behind the heart), the somatopleure beneath the embryo is entirely missing; evidently it had been torn away by the operation and had not been replaced. Throughout this region the extra-embryonic somatopleure begins on each side of the embryo with a free edge. A short distance behind the heart, folded portions of the original amnion appear lying in the gap in the somatopleure, and continuous with the midventral line of the body-wall. Beginning with about the 3/ist section (see Fig. 13) the body wall is open ventrally, and is continuous with the. 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, Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
