File:Agelena labyrinthica ventral plate at three stages.jpg

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FIG. 203. TRANSVERSE SECTIONS THROUGH THE VENTRAL PLATE OF AGELBNA LABYRINTHICA AT THREE STAGES. A. Stage when about three segments are formed. The mesoblastic plate is not divided into two bands. B. Stage when six segments are present (fig. 200 B). The mesoblast is now divided into two bands. C. Stage represented in fig. 200 D. The ventral cords have begun to be formed on thickenings of the epiblast, and the limbs are established.

ep. epiblast ; me. mesoblast ; me.s. mesoblastic somite ; vn. ventral nerve-cord ; yk. yolk.
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https://archive.org/details/theworks02balfuoft/page/448/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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current10:23, 2 March 2024Thumbnail for version as of 10:23, 2 March 20241,120 × 719 (454 KB)Rasbak (talk | contribs){{Information |description=FIG. 203. TRANSVERSE SECTIONS THROUGH THE VENTRAL PLATE OF AGELBNA LABYRINTHICA AT THREE STAGES. A. Stage when about three segments are formed. The mesoblastic plate is not divided into two bands. B. Stage when six segments are present (fig. 200 B). The mesoblast is now divided into two bands. C. Stage represented in fig. 200 D. The ventral cords have begun to be formed on thickenings of the epiblast, and the limbs are established. ep. epiblast ; me. mesoblast ; me....

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