File:Nassa mutabilis segmentation.jpg

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Description FIG. 104. SEGMENTATION OF NASSA MUTABILIS. (From Bobretzky.) A. Upper half divided into two segments. B. One of these has fused with the large lower segment. C. Four small and one large segment, one of the former fusing with the large segment. D. Each of the four segments has given rise to a fresh small segment. E. Small segments have increased to thirty-six. The embryo is then formed of a cap of small cells which may be spoken of as the blastoderm resting upon four large yolk-cells of which one is considerably larger than the others (fig, 104 A). The small and the large cells are separated by a segmentation cavity.
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https://archive.org/details/theworks02balfuoft/page/232/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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current02:12, 1 March 2024Thumbnail for version as of 02:12, 1 March 20241,016 × 768 (864 KB)Rasbak (talk | contribs){{Information |description=FIG. 104. SEGMENTATION OF NASSA MUTABILIS. (From Bobretzky.) A. Upper half divided into two segments. B. One of these has fused with the large lower segment. C. Four small and one large segment, one of the former fusing with the large segment. D. Each of the four segments has given rise to a fresh small segment. E. Small segments have increased to thirty-six. The embryo is then formed of a cap of small cells which may be spoken of as the blastoderm resting upon four...

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