. Elementary text-book of zoology. Zoology. 0 FIG. 108.—A, Blastosphere of Amphioxus ; B, invagination of the same; C, gastrula, invagi- nation completed ; O, blastopore (after B. Hatschek). aperture of invagination (Uastof>ore, mouth of gastrula) becomes the endodernial layer (hypoblasf) lining the gastrula cavity. The outer layer of cells constitutes the ectoderm or epiblast. This mode of formation of the gastrula, which is very common, is found, , in Ascidians, and amongst the Vertebrata in Amphioxus (fig. 108). More rarely the gastrula arises by delamination. This process consists o
. Elementary text-book of zoology. Zoology. 0 FIG. 108.—A, Blastosphere of Amphioxus ; B, invagination of the same; C, gastrula, invagi- nation completed ; O, blastopore (after B. Hatschek). aperture of invagination (Uastof>ore, mouth of gastrula) becomes the endodernial layer (hypoblasf) lining the gastrula cavity. The outer layer of cells constitutes the ectoderm or epiblast. This mode of formation of the gastrula, which is very common, is found, , in Ascidians, and amongst the Vertebrata in Amphioxus (fig. 108). More rarely the gastrula arises by delamination. This process consists of a concentric splitting of the cells of the blastosphere into an outer layer (epiblast), and an inner (hypoblast) (fig. 109). A. 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
