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File:Philodromus limbatus segmentationm late stages.jpg

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Description FIG. 54. When only two rosettes are present the protoplasm with its nucleus occupies a central position in each rosette, but gradually, in the course of the subsequent subdivisions, it travels towards the periphery, and finally occupies, when the stage with thirtytwo rosettes is reached, a peripheral position. The peripheral protoplasm next becomes separated off as a nucleated layer(fig- 54 B). It forms the proper blastoderm, and in it the nuclei rapidly multiply and finally around each an hexagonal or polygonal area of protoplasm is marked off; and a blastoderm, formed of a single layer of flattened cells, is thus constituted. The columns within the blastoderm now form (fig. 54 B) more or less distinct masses, which are stated by Ludwig to be without protoplasm. bl. blastoderm ; yk. yolk spheres.
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https://archive.org/details/theworks02balfuoft/page/118/mode/2up?view=theater&q=blastoderm THE WORKS OF FRANCIS MAITLAND BALFOUR VOL. III

A TREATISE ON COMPARATIVE EMBRYOLOGY.
Author M. FOSTER, F.R.S., ADAM SEDGWICK, M.A.,

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current01:53, 1 March 2024Thumbnail for version as of 01:53, 1 March 20241,214 × 602 (752 KB)Rasbak (talk | contribs){{Information |description=FIG. 54. When only two rosettes are present the protoplasm with its nucleus occupies a central position in each rosette, but gradually, in the course of the subsequent subdivisions, it travels towards the periphery, and finally occupies, when the stage with thirtytwo rosettes is reached, a peripheral position. The peripheral protoplasm next becomes separated off as a nucleated layer(fig- 54 B). It forms the proper blastoderm, and in it the nuclei rapidly multiply an...

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