. Contributions to embryology. Embryology. 14G A HIMAN EMBRYO OF TWT:NTY-F0UR PAIRS OF SOMITES. the chorda from the medullary tube dorsally and the digestive tu])e ventrally can he noted by a comparison of the si)ccimens. Its dorsal sejniration seems to begin anteriorly and to proceed caudahvard. \'entrally separation ajjjjarently begins in the middle region of the body and progresses both anteriorly and posteriorly. Another point of ventral separation begins anteriorly and progresses caudally, the last portion to become separated undoubtedly l^eing that which is fused to the pharj^ Watt d
. Contributions to embryology. Embryology. 14G A HIMAN EMBRYO OF TWT:NTY-F0UR PAIRS OF SOMITES. the chorda from the medullary tube dorsally and the digestive tu])e ventrally can he noted by a comparison of the si)ccimens. Its dorsal sejniration seems to begin anteriorly and to proceed caudahvard. \'entrally separation ajjjjarently begins in the middle region of the body and progresses both anteriorly and posteriorly. Another point of ventral separation begins anteriorly and progresses caudally, the last portion to become separated undoubtedly l^eing that which is fused to the pharj^ Watt describes what lie considers to be neurcntcric canals in his twin cinliryos. They are situated dorsal to the cloaca and consist of a connecting rod of cells joining the chorda with the medullary tul)e dorsally and with the entoderm ventrally. This region in my specimen is cut through sagitlally, l)ut a,s seen in text-fiirures K ;iii(l 0. no evidence of such a cord of cells is 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 Carnegie Institution of Washington. Washington, D. C
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Keywords: ., bookauthorcarn, bookpublisherwashingtondc, booksubjectembryology
