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 APTILOTA 173 merited, three divisions posterior to the tubus ventralis usually being visible, while at the posterior end the beginning of the proctodaeum is Fig. abd4— abd3- mx I ma abd' 79.—Isotoma. Longitudinal section, {abd) Abdominal rudiments, {do) Dorsal organ, {hi) Head lobe, {md) Mandible, (mx) Maxillae. evident. The stomodaeum, which made its appearance a s

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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 APTILOTA 173 merited, three divisions posterior to the tubus ventralis usually being visible, while at the posterior end the beginning of the proctodaeum is Fig. abd4— abd3- mx I ma abd' 79.—Isotoma. Longitudinal section, {abd) Abdominal rudiments, {do) Dorsal organ, {hi) Head lobe, {md) Mandible, (mx) Maxillae. evident. The stomodaeum, which made its appearance a short time before, has lengthened, the apex of the invagination reaching the yolk (Fig. 80), the inner layer being absent at this point. Both in front of and behind the stomodaeum is a cell mass which will give rise to the anterior

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