. A manual of zoology. Zoology. 158 OENBHAL PRINCIPLES OF ZOOLOGY. to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. Mesothelium.—In the second case the mesoderm may preserve the einthelial character of the two primary germ-layers, so that it. Fig, 107.—Formation of the mesencliyme and beginning of gastmlation in Holofhnn'a tiihuUisd. (After 8elenka, from Balfour.) cf, cleavage caviti^; ep, ectoderto; hy, entoderm; ;/(.s, mesencliyme cells; ae, archenteron. is called mesoilieliuin. The mesothelium is cut off from the entoderm, the mode of de
. A manual of zoology. Zoology. 158 OENBHAL PRINCIPLES OF ZOOLOGY. to gelatinous connective tissue, from which certain organs either wholly or in part take their origin. Mesothelium.—In the second case the mesoderm may preserve the einthelial character of the two primary germ-layers, so that it. Fig, 107.—Formation of the mesencliyme and beginning of gastmlation in Holofhnn'a tiihuUisd. (After 8elenka, from Balfour.) cf, cleavage caviti^; ep, ectoderto; hy, entoderm; ;/(.s, mesencliyme cells; ae, archenteron. is called mesoilieliuin. The mesothelium is cut off from the entoderm, the mode of development being shown in the embryology of the worm Sagitlii (fig. 108). A n. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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