. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 509 face. Between the ectoderm and test there is, frequently, a thin film of protoplasm containing a few scattered nuclei. The dorsal ectoderm cells enlarge and form the shell-gland and, soon after, an ectodermal invagination, in the region of the blastopore, forms the stomodoeum. The stomodamm comes to lie on the ventral side of the embryo just inside the test. It is to this tube that I pre- viously1) gave the name of ventral tube, but, as I have since found that, in Yoldia, it is ectodermal in origin, there is no reason to
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 509 face. Between the ectoderm and test there is, frequently, a thin film of protoplasm containing a few scattered nuclei. The dorsal ectoderm cells enlarge and form the shell-gland and, soon after, an ectodermal invagination, in the region of the blastopore, forms the stomodoeum. The stomodamm comes to lie on the ventral side of the embryo just inside the test. It is to this tube that I pre- viously1) gave the name of ventral tube, but, as I have since found that, in Yoldia, it is ectodermal in origin, there is no reason to give it a special 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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