File:The primitive streak and notochordal canal in Chelonia (Plate IV) BHL4780742.jpg

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PLATE IV.
All figures on this plate are magnified 73 diameters. The position and direction of the sections, Figs. 14 to 21, are indicated in Diagram I., page 6, by the corresponding numbers.
Fig. 14. Sagittal section of embryo β (by mistake lettered a) of Fig. 8, slightly oblique to the axis of β. The notochordal canal of β (can. nt'cd. β) has not opened ventrally. The notochordal canal (?) of a (can. nt'cd. a) is cut transversely. Consult text, page 7.
Fig. 15. A section which passes through the left horn of the notochordal opening of β near its end.
Fig. 16. Section cutting transversely the notochordal canal of a near the middle of its extent.
Fig. 17. Seventh section in front of the anterior lip of the notochordal canal of a. The ectoderm and entoderm of this lip are not completely differentiated. A groove (sul. pr. p.) lies on the surface of the floor of the canal.
Fig. 18. Cross section of a behind the blastopore. A primitive groove (sul. pr. p.), which is continuous with that of Fig. 17, is present.

Fig. 19. Section showing the primitive streak (str. pr.), upon which, however, the groove does not extend as far backward as the place of this section.
Date
Source https://www.biodiversitylibrary.org/pageimage/4780742 The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark.
Author Davenport, Gertrude Anna Crotty
Page ID
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4780742
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 IV
BHL Page URL
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https://www.biodiversitylibrary.org/page/4780742
DOI
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10.5962/bhl.title.5777
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Illustration
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Date/TimeThumbnailDimensionsUserComment
current23:47, 8 April 2024Thumbnail for version as of 23:47, 8 April 20242,054 × 3,526 (1.05 MB)Rasbak (talk | contribs)
15:00, 19 November 2015Thumbnail for version as of 15:00, 19 November 20152,118 × 3,526 (443 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | source = http://www.biodiversitylibrary.org/pageimage/4780742 | description = The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark. |...

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