. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 220 from the egg periphery of that side, while the ventral lip was 25 divisions from the periphery on its side — the distances measured along a dorso-ventral diameter), and the neural groove had appeared. The neural groove extended from the dorsal lip to the periphery, and down over the entire edge of the flattened egg. In this experiment as in others, the apparent position of the blastopore is so influenced by rotation (often very slow) that it must be dis- regarded as evidence bearing upon the actual movement of the blastop
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 220 from the egg periphery of that side, while the ventral lip was 25 divisions from the periphery on its side — the distances measured along a dorso-ventral diameter), and the neural groove had appeared. The neural groove extended from the dorsal lip to the periphery, and down over the entire edge of the flattened egg. In this experiment as in others, the apparent position of the blastopore is so influenced by rotation (often very slow) that it must be dis- regarded as evidence bearing upon the actual movement of the blastopore lip- — In Fig. 11 a, a sketch of this egg is given, made V2 hour later than Fig. 10, at 10,30 , and showing the mid- ventral portion of the blastopore lip. The line 1 points to a cell boundary in the ectoderm, which at the time was 66 fi from the ventral lip of the blasto- pore. The cell boundary steadily appro- ached the lip, reaching it at 11,20 The similar figure 11 b was drawn at 11,30 The ectodermal cell boundary c, b, which at this time was 66 ft from the lip, gradu- ally approached the lip, and at 12 was only 22 /< from it. Summary of experiment: the disappearance of ectoderm cells round the ventral lip was Fig. 10. Upper surface of com- pressed egg. dorsal lip. Ventral lip, V. I., is forming. Actual dia- meter of compressed egg 1,936 mm; of blastopore in dorso-ventral direc- tion 1,232 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer
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