. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 362 EMBRYOLOGY OF INSECTS AND MYRIAPODS on the inside the cell wall has not been completed. After they reach the periplasm, some of the nuclei migrate back into the yolk where they become the yolk cells, or vitellophags, as indi- cated by DuBois (1932). Before the inner cell walls of the. Fig 313 âSciara Section of de- \ eloping blastoderm, foui hours old. (cc) Cleavage cells, (gc) Germ cells. iy) Yolk. Fig
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 362 EMBRYOLOGY OF INSECTS AND MYRIAPODS on the inside the cell wall has not been completed. After they reach the periplasm, some of the nuclei migrate back into the yolk where they become the yolk cells, or vitellophags, as indi- cated by DuBois (1932). Before the inner cell walls of the. Fig 313 âSciara Section of de- \ eloping blastoderm, foui hours old. (cc) Cleavage cells, (gc) Germ cells. iy) Yolk. Fig. 314.âSciara Cioss section of de- veloping blastoderm four and one-half hours old. {cc) Cleavage cells, (y) Yolk. blastodermal cells are formed, the germ cells migrate inward, passing separately between the blastodermal cells (Fig. 313). They lie just inside '^'â ^r^ ?^ gc- 'i?fiMk Fig. 315.âSciara. Longitudinal section of posterior pole of egg. (gc) Germ cells, (os) Oosome. the blastoderm at the posterior end of the egg. At about the tenth hour, when the germ cells and the vitellophags have completed their inward. 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 Johannsen, O. A. (Oskar Augustus), 1870-1961; Butt, Ferdinand Hinckley, 1899-. New York, London, McGraw-Hill Book Company, inc.
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