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abdominal segment adult animal antennae Anurida appears appendages Apterygota arranged blastoderm blastomeres Blatta body cavity Borax carmine Campodea cell body central cephalic elongation changes chilognath chromatin chromosomes collophore connection crenated membrane crustaceans degeneration described distinct distinctly dorsal organ early embryo Endfaden entoderm entoderm cells envelope evident female pronucleus follicle cells found in Anurida germ band germ cells germinal epithelium germinal vesicle Glomeris groups haematoxylin hatched hexapod hinder end holoblastic holoblastic cleavage homology insect irregular Japyx later layer Lepisma Longisection Machilis mandibles mass of protoplasm mature maxillae mesenteron mesoderm migration morula mouth-parts myriapods nutritive cells Orange G origin outer ovarioles ovary oviduct ovum paired polar bodies precephalic organ pronucleus protoplasm remains reproductive organs seen shown in Fig shows somite stage staining structure Stuhlmann surface thoracic tube length 15J unpaired vesicular vitelline membrane yolk cells yolk formation yolk nucleus Zool
Page 286 - 84 WILL, L. Ueber die Entstehung des Dotters und der Epithelzellen bei den Amphibien und Insecten.
Page 286 - Zool., 114, 1915, pp. 233-402, 2 pis., I chart and 2 text-figs. 1890. Wheeler, WM On the Appendages of the First Abdominal Segment of Embryo Insects. Trans. Wis. Acad. Sc. Arts. Lett., 8, 1890, pp. 87-140, 3 pis. 1900. Wheeler, WM A Study of Some Texan Ponerinae.
Page 287 - 83 Wood-Mason, J. Notes on the structure, post-embryonic development and systematic position of Scolopendrella. Ann.
Page 286 - RYDER, JA The Structure, Affinities and Species of Scolopendrella. Proc. Acad. Nat. Sci., Phila., for 1881, p.
Page 267 - ... of Malpighian tubules associated with hindgut. 6. Sexes are separate. Subclass- 1 Progeneata 1. The genital apertures are situated near the anterior end of the body. Order (i) Pauropoda 1. The trunk segments are eleven and anal segment is also present. 2. There are 9 pairs of legs. 3. The head bears one pair of antennae, one pair of mandibles and one pair of maxillae. 4. These are without blood vascular system and trachea. Example: Pauropus. Order (ii) Diplopoda 1. Body is usually cylindrical....
Page 280 - Since finishing this article, two contributions have been made to our knowledge of the development of the Apterygota, in both cases of the Thysanura.