. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 166 EMBRYOLOGY OF INSECTS AND MYRIAPODS The inner layer is formed by a division of the cells of the blastoderm, giving rise finally to a complete second layer of cells below the first (Fig. 68). Within are the yolk cells (yc), differing from the peripheral. Fig. 64.—Isotoma. Egg in eight-cell stage. Fig. 65.—Isotoma. 64-cell stage. cells in being vacuolate, and the cluster of germ cells {gc) now avcII diffe
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 166 EMBRYOLOGY OF INSECTS AND MYRIAPODS The inner layer is formed by a division of the cells of the blastoderm, giving rise finally to a complete second layer of cells below the first (Fig. 68). Within are the yolk cells (yc), differing from the peripheral. Fig. 64.—Isotoma. Egg in eight-cell stage. Fig. 65.—Isotoma. 64-cell stage. cells in being vacuolate, and the cluster of germ cells {gc) now avcII differentiated. The embryo has now become oval with a somewhat accentuated pole where the dorsal organ will develop. The cells of this organ (rfc), devel- oped from the outer layer and increasing in depth, soon are sharply. 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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