Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 Fig. 128.—BlaUella. Lateral aspect of egg. A, before cleavage. B, after cleavage. {From Wheeler.) in its ootheca. After fertilization the cleavage cells migrate to the egg surface, the blastoderm being completed in about 60 hours at 27°C. After reaching the surface some of the cleavage cells turn back into the Fig. 129.—Blattella! Section through stomodaeum {stom) of five-day embryo,

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Embryology of insects and myriapods; Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching embryologyofinse00joha Year: 1941 Fig. 128.—BlaUella. Lateral aspect of egg. A, before cleavage. B, after cleavage. {From Wheeler.) in its ootheca. After fertilization the cleavage cells migrate to the egg surface, the blastoderm being completed in about 60 hours at 27°C. After reaching the surface some of the cleavage cells turn back into the Fig. 129.—Blattella! Section through stomodaeum {stom) of five-day embryo, {am) Amnion, {ect) Ectoderm, {mes) Mesoderm, {ser) Serosa. yolk to become vitellophags. Shortly afterward the embryonic rudiment forms in the middle half on the ventral surface (along the V-shaped ridge) of the egg, the blastoderm on the dorsal and lateral surface becoming thin

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