Fil:The primitive streak and notochordal canal in Chelonia (Plate III) BHL4780738.jpg

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PLATE III.
All figures are magnified 39 diameters, except Figures 12 and 12’, which are magnified 10 diameters.
Fig. 11. Chrysemys picta, dorsal view. The horns of the notochordal canal are directed posteriad. A slight pit is discernible at the anterior third of the shield.
Figure 11'. Ventral view of the same, showing narrow opening of the notochordal canal.
Fig. 12. Ventral view of an embryo of Chelydra serpentina.
Fig. 12'. Dorsal view of the same. The medullary folds are beginning to close. The notochordal opening or neurenteric canal is reduced to a small horseshoe-shaped opening near the posterior end of the embryo.
Fig. 13. Chelydra serpentina, dorsal view. The horns of the notochordal opening are bent far posteriad.

Fig. 13'. Ventral view of the same. The notochordal canal opens ventrally.
Dato
Kilde https://www.biodiversitylibrary.org/pageimage/4780738 The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark.
Opphavsperson Davenport, Gertrude Anna Crotty
Page ID
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4780738
Item ID
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26729 (Find related Wikimedia Commons images)
Title ID
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5777 (Find related Wikimedia Commons images)
Page numbers
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Plate III
BHL Page URL
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https://www.biodiversitylibrary.org/page/4780738
DOI
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10.5962/bhl.title.5777
Page type
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Illustration Foldout
Credit
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NOT_IN_COPYRIGHT
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