. Elementary text-book of zoology. Zoology. 0. BL D' Kl FIG. 598.—Development of Amphioxiis (after B. Hatschek). A, Blastosphere. B, commencing invagination of the entoclerm (gastrula). C, Later gastrula, the cilia of the ectoderm cells are not represented. D, Stage with two somites (primitive segments), seen in optical longitudinal section. US, Primitive segments or somites ; MF, mesoderm folds , N, medullary canal; Oe, external opening of the latter. E, Stage with nine somites seen from the dorsal surface to shew the asymmetry of the somites, the notochord (Ch) is shown in section. F, Larva
. Elementary text-book of zoology. Zoology. 0. BL D' Kl FIG. 598.—Development of Amphioxiis (after B. Hatschek). A, Blastosphere. B, commencing invagination of the entoclerm (gastrula). C, Later gastrula, the cilia of the ectoderm cells are not represented. D, Stage with two somites (primitive segments), seen in optical longitudinal section. US, Primitive segments or somites ; MF, mesoderm folds , N, medullary canal; Oe, external opening of the latter. E, Stage with nine somites seen from the dorsal surface to shew the asymmetry of the somites, the notochord (Ch) is shown in section. F, Larva with mouth (O) and first gill slit (K) seen from the left side; D, intestine; SI, ventral blood-vessel. greater part of the length of the branchial sac (fig. 597, Ov). The generative products are dehisced into the atrial cavity, and pass thence through the pharynx and mouth to the exterior. For a short distance in front of the atrial pore the epithelium of. 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 Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
