. The biology of insects. Insects -- Biology. 156 THE BIOLOGY OF INSECTS. Fig. 41.—Formation of the Mid-gut (mesenteron) in various Insects. A, Longitudinal section through front region of Embryo of Mason Bee (Chalicodoma). B, Similar section through same region of Embryo of Leaf-beetle (Donacia). C. Longitudinal section through central part of digestive tract of Larval Dragon-fly (Epitheca). ec, ectoderm ; m, mesoderm ; en, endoderm ; er (in B), rudiment of mid-gut (regarded as ectodermal) ; b (in A), boundary of endoderm and mesoderm ; v (in C), vitellophags (yolk-devouring cells) : s, stomo
. The biology of insects. Insects -- Biology. 156 THE BIOLOGY OF INSECTS. Fig. 41.—Formation of the Mid-gut (mesenteron) in various Insects. A, Longitudinal section through front region of Embryo of Mason Bee (Chalicodoma). B, Similar section through same region of Embryo of Leaf-beetle (Donacia). C. Longitudinal section through central part of digestive tract of Larval Dragon-fly (Epitheca). ec, ectoderm ; m, mesoderm ; en, endoderm ; er (in B), rudiment of mid-gut (regarded as ectodermal) ; b (in A), boundary of endoderm and mesoderm ; v (in C), vitellophags (yolk-devouring cells) : s, stomodaeum (forming mouth and fore-gut; me, mJd-gut; p, proctodaeum (forming hind-gut). X about 500. A, after J. Carri^re and O. Biirger (Nova Acta Leopold-Carol. Akad. Ixix, 1897). B, after K. Friederichs {lb. Ixxxv, 1906). C, after H. yon Tschuproff {Zool. Ans. xxvii, 1903).. 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 Carpenter, George H. (George Herbert), 1865-1939. New York, The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyorkthemacmilla
