. Carnegie Institution of Washington publication. . Photographs of sections of axial structures, the locatirn ,unl direction of which are indicated in the text-Inures. In all the photographs and drawings the right side of the embryo is on the left in the plates, i. e. all views looking caudad. Dorsal structures are cut ^liuhtly more anterior than ventral ones. (Cf. text-figure 3.) 1. Section Posterior part of primitive streak. X KiO. Section 406. Most caudal section in which arehenteric canal appears. Its location maybe recognized by the absence of nuclei. X 160. :!. Section 401. Arehent
. Carnegie Institution of Washington publication. . Photographs of sections of axial structures, the locatirn ,unl direction of which are indicated in the text-Inures. In all the photographs and drawings the right side of the embryo is on the left in the plates, i. e. all views looking caudad. Dorsal structures are cut ^liuhtly more anterior than ventral ones. (Cf. text-figure 3.) 1. Section Posterior part of primitive streak. X KiO. Section 406. Most caudal section in which arehenteric canal appears. Its location maybe recognized by the absence of nuclei. X 160. :!. Section 401. Arehenteric canal where largest and best defined. X 400. I. Section*):). Large (second) ventral opening, "plaque notochordale" very distinct. X 400. :>. Section 380. Completion plate where best developed. X 160. (i. Section 375. Completion plate near anterior limit. X 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, Carnegie Institution of Washington
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