. Contributions to embryology. Embryology. 'frz. '. X x^**'^*5 |'-* *â¢, o .-) The following drawings (indicated by D in the text-figures) are obviously reconstructions and therefore some- what schematic. Thev would cut the median line at or near the points traversed by the sections shown in the photographs (Plate 2. figs. 1 to 4), and have therefore been designated by the same section number. In other- words^section (photograph) 425 and drawing (section) 42;j would intereect in tlie median line. Like the photographs ihey are slightly oblique dorsoventrally. (Section) 42o. Posterior part
. Contributions to embryology. Embryology. 'frz. '. X x^**'^*5 |'-* *â¢, o .-) The following drawings (indicated by D in the text-figures) are obviously reconstructions and therefore some- what schematic. Thev would cut the median line at or near the points traversed by the sections shown in the photographs (Plate 2. figs. 1 to 4), and have therefore been designated by the same section number. In other- words^section (photograph) 425 and drawing (section) 42;j would intereect in tlie median line. Like the photographs ihey are slightly oblique dorsoventrally. (Section) 42o. Posterior part of primitive streak. X 100. (Section) 40(5-f. 1 opening of archenteric canal. X 100. (Section) 401. Typical head process, archenteric canal, "plaque notochordale' and "plaque lec'; X 100. (Section) 394+. Large ventral opening, "plaque ; X 100. t â ii Idealized cross-section (reconstruction) at the point where all three germ-layerv; are contmuous. Its location, while not , can be made out from text-figure 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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