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 OLIGOENTOMATA AND APT I LOT A 171 beyond the cellular layer and spread out mushroom-like. The outer end in most cases shows a connection with the second crenated membrane (Figs. 72, 74) but in some cases is still connected with the first crenated membrane (Fig. 75). The dorsal organ appears to be glandular and may Fig. 75.—Isotoma. Dorsal organ, ser) Amnioserosa. {cut) Crenated membr

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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 OLIGOENTOMATA AND APT I LOT A 171 beyond the cellular layer and spread out mushroom-like. The outer end in most cases shows a connection with the second crenated membrane (Figs. 72, 74) but in some cases is still connected with the first crenated membrane (Fig. 75). The dorsal organ appears to be glandular and may Fig. 75.—Isotoma. Dorsal organ, ser) Amnioserosa. {cut) Crenated membrane. possibly be concerned with the molting of the crenated membranes. Buds of head and thoracic appendages are now evident as well as the anterior abdominal segments (Figs. 76, 77). A section through the region of an appendage now reveals that the inner layer consists of two layers laterally and of one layer in the middle which indicates developing coelomic sacs ('somites') without a cavity (Fig. 78). In this species

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