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 am A B Fig. 304.—Diacrisia. A, cross section of abdomen of 52-hour embryo. B, cross section of head at 57 hours, {am) Amnion, (coel) Coelomic cavity, (.lim. m) Limiting membrane of the stomodaeum. (Ir) Labrum. {mes) Mesoderm, {neur) Neuroblast. (neurg) Neural groove. six (Fig. 305, coel) with a single pair in the preoral region. At this time also the mouth parts have distinctly elongate

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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 am A B Fig. 304.—Diacrisia. A, cross section of abdomen of 52-hour embryo. B, cross section of head at 57 hours, {am) Amnion, (coel) Coelomic cavity, (.lim. m) Limiting membrane of the stomodaeum. (Ir) Labrum. {mes) Mesoderm, {neur) Neuroblast. (neurg) Neural groove. six (Fig. 305, coel) with a single pair in the preoral region. At this time also the mouth parts have distinctly elongated, though their segmenta- tion is not yet evident (Fig. 3055). Meanwhile segmentation of thorax and abdomen, which began after 40 hours, has distinctly progressed. At 48 hours (Fig. 302) the meso- derm clearly shows a segmental character. The neural groove is deep

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