File:Agelena labyrinthica four stages in the development.jpg

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FIG. 200. FOUR STAGES IN THE DEVELOPMENT OF AGELENA LABYRINTHICA. A. Stage when the ventral plate is very imperfectly differentiated, pr.c. primitive cumulus. B. Ovum viewed from the side when the ventral plate has become divided into six segments, ch. segment of chelicerae imperfectly separated from procephalic lobe ; pd. segment of pedipalpi. C. Ventral plate ideally unrolled after the full number of segments and appendages are established, st. stomodoeum between the two proe-oral lobes. Behind the six pairs of permanent appendages are seen four pairs of provisional appendages.

D and E. Two views of an embryo at the same stage. D ideally unrolled, E seen from the side. st. stomodseum ; ch. chelicerse ; on their inner side is seen the ganglion belonging to them. pd. pedipalpi ; pr.p. provisional appendages.
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https://archive.org/details/theworks02balfuoft/page/440/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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current10:09, 2 March 2024Thumbnail for version as of 10:09, 2 March 2024988 × 691 (718 KB)Rasbak (talk | contribs){{Information |description=FIG. 200. FOUR STAGES IN THE DEVELOPMENT OF AGELENA LABYRINTHICA. A. Stage when the ventral plate is very imperfectly differentiated, pr.c. primitive cumulus. B. Ovum viewed from the side when the ventral plate has become divided into six segments, ch. segment of chelicerae imperfectly separated from procephalic lobe ; pd. segment of pedipalpi. C. Ventral plate ideally unrolled after the full number of segments and appendages are established, st. stomodoeum between...

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