. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. Fig. 13. Fig. 14. Fig. 13. Transverse section of a 45 hour embryo of Yoldia limatula, taken just in front of the second band of cilia, tng mid-gut. sg shell-gland, std stomodseum. t test. Fig. 14. Transverse section of an embryo of Nucula delphinodonta, in which the mantle is just beginning to form. The section is taken about mid-way of the embryo. tn mantle, mg mid-gut. std stomoda?um. t test. The stomodaeum, Figs. 11, 12, 13 and 15 std, pushes in, and joins the mid-gut, mg, which is formed in the anterior portion of the em-
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. Fig. 13. Fig. 14. Fig. 13. Transverse section of a 45 hour embryo of Yoldia limatula, taken just in front of the second band of cilia, tng mid-gut. sg shell-gland, std stomodseum. t test. Fig. 14. Transverse section of an embryo of Nucula delphinodonta, in which the mantle is just beginning to form. The section is taken about mid-way of the embryo. tn mantle, mg mid-gut. std stomoda?um. t test. The stomodaeum, Figs. 11, 12, 13 and 15 std, pushes in, and joins the mid-gut, mg, which is formed in the anterior portion of the em- bryo. In the meantime in Y. limatula and N. proxima, the shell-gland has attained its greatest invagination, that is it has become slightly concave, Figs. 11 and 12, sg. In N. delphinodonta it flattens but does not become concave. In all, the shell-glands soon arch upward pre- paratory to protruding laterally to form the mantle, Fig. 14 m. The cells from which the cerebral ganglia of Yoldia are formed, arch inward and form two pouches that lie side by side. These pouches 1) Johns Hopkins Univ. Circulars, No. 132, 1897. An/., XV. Aufsätze. 34. 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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