. Text-book of embryology. Embryology. at â â â â Q Fig. 220. âAbnormal embryos illustrating the Protostoma theory. A, abnormal Frog embryo seen from the dorsal side ; B, transverse section through hinder third of ditto (after O. Hertwig, 1892) ; C, abnormal Trout embryo (S. fario) in dorsal view (after Kopsch, 1899) ; D, abnormal embryo of Pike (Esox Zucius) (after Lereboullet, 1863). , medullary fold ; , mesoderm segment; mes, mesoderm; N, notochord ; 0, opening leading down into enteron ; ot, otocyst; y, mass of yolk-cells. t (1892) that by fertilizing frog's eggs which had beco
. Text-book of embryology. Embryology. at â â â â Q Fig. 220. âAbnormal embryos illustrating the Protostoma theory. A, abnormal Frog embryo seen from the dorsal side ; B, transverse section through hinder third of ditto (after O. Hertwig, 1892) ; C, abnormal Trout embryo (S. fario) in dorsal view (after Kopsch, 1899) ; D, abnormal embryo of Pike (Esox Zucius) (after Lereboullet, 1863). , medullary fold ; , mesoderm segment; mes, mesoderm; N, notochord ; 0, opening leading down into enteron ; ot, otocyst; y, mass of yolk-cells. t (1892) that by fertilizing frog's eggs which had become over-ripe, either by retention within the oviduct or by being kept for from one to four days in a moist chamber, he obtained a certain number of abnormal embryos of the type shown in Fig. 220, A, where a large expanse of yolk-cells is visible in dorsal view instead of being com- pletely covered in as would be the case normally. In transverse section (Fig. 220, B) such an embryo was found to have two half. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan
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