. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 390 EMBRYOLOGY OF INSECTS AND MYRIAPODS the coelomic sacs at the anterior end surrounds the stomodaeal invagina- tion and at first even covers its bhnd end. Some mesoderm also pushes into the labrum and into the clypeal region. In a similar manner at the posterior end residual mesoderm covers the proctodaeal invagination. In splm s yc Vc ent. ster vm Fig. 346.—Scolopendra cingulata. Cross section of rump se
. Embryology of insects and myriapods; the developmental history of insects, centipedes, and millepedes from egg desposition [!] to hatching. Embryology -- Insects; Embryology -- Myriapoda. 390 EMBRYOLOGY OF INSECTS AND MYRIAPODS the coelomic sacs at the anterior end surrounds the stomodaeal invagina- tion and at first even covers its bhnd end. Some mesoderm also pushes into the labrum and into the clypeal region. In a similar manner at the posterior end residual mesoderm covers the proctodaeal invagination. In splm s yc Vc ent. ster vm Fig. 346.—Scolopendra cingulata. Cross section of rump segment, (coel) Coelomic sac. {dm) Membrana dorsalis. (ent) Entoderm cell, (p) Leg. (sin) Sinus, {splm) Splanchnic mesoderm, {ster) Sternite. {ter) Tergite. {vm) Membrana ventralis. {yc) Yolk cell. {Adapted from Heymons.) addition to the median masses of mesoderm, isolated mesenchyme cells may be found along the median line. After the rudiments of the appendages appear, each coelomic sac may ])e regarded as composed of three parts: the middle part whose cavity extends into the developing appendage, a mesad projecting flattened part with a cleft-like cavity lying under the anlage of the sternite, and a similar lateral part lying under the anlage of the tergite. Figure 346 represents pren bl enl ap+ ini md mxl rnx2. 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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