. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. am Fig. 289.—Neophylax. Cross section through thorax before appendages appear. {am) Amnion, {ch) Chorion, {il) Inner layer, (ser) Fig. 290.—Neophylax. Lateral view of 12-day embryo, {am) Amnion, {an) Anus. {ant) Antenna, {ceph) Cephalic lobes, {ch) Chorion. {Ih) Labium, {md) Mandible, (mx) Maxilla, (p 1) First thoracic leg. cells with no definite body cavity present. Later the mesoderm increases in
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. am Fig. 289.—Neophylax. Cross section through thorax before appendages appear. {am) Amnion, {ch) Chorion, {il) Inner layer, (ser) Fig. 290.—Neophylax. Lateral view of 12-day embryo, {am) Amnion, {an) Anus. {ant) Antenna, {ceph) Cephalic lobes, {ch) Chorion. {Ih) Labium, {md) Mandible, (mx) Maxilla, (p 1) First thoracic leg. cells with no definite body cavity present. Later the mesoderm increases in extent, and at the same time the cells composing it become less defi- nitely and compactly arranged. The yolk becomes reduced in amount and gradually recedes from the ventral plate. Into the cavity thus formed amoeboid mesoderm cells migrate, giving rise to the blood cor- puscles. As the yolk continues to withdraw from the ventral plate, the. 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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