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On the Development of Oecanthus Niveus and Its Parasite, Teleas

On the Development of Oecanthus Niveus and Its Parasite, Teleas


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt: ...embryo, while those 'of the long commissures remain permanently distinct from one another. The nerves of the adult insect are, in their basal portions at least, simple outgrowths of the fibres of the cross commissures, each with a sheath of ganglionic cells. At the time of the closure of the body wall, they are finger-like processes and they, like the outgrowing ocellar and antennal nerves, project in pairs from either side of the ganglia. (Pi. 20, figs. 22 and 23.) The ganglionic cells give rise to the fibrous portion of the nervous system, probably by the prolongation of their cell walls into filaments. Pi. 22, fig. 2, shows the nucleus of a single ganglionic cell, from the periphery of which fine filaments radiate and pass into the fibrous portion of the brain, leaving a cavity about the nucleus and its radial fibres. The nervous cord in the hatched embryo embraces 17 pairs of ganglia. Numbering from before backwards, 1, forms the brain; 2, 3,4, the suboesophageal; 5, 6, 7, the thoracic; 8-17, the abdominal ganglia. During embryonic life the brain shows no traces of the specialized parts (e. g. calices, trabeculae, central body, etc.) found in the adult. In pl. 22, fig. 1, are figured three pairs of large nuclei which occur in the adjacent walls of the successive thoracic ganglia. PI. 22, fig. 7, represents these nuclei more highly magnified. No nuclear membrane is distinguishable. The nuclear substance appears finely granular in the sections, and near the centre of each of the nuclei occupying the anterior edge of a ganglion is a bar-shaped nucleolus, while the, nuclei lying in the posterior edge of a ganglion possess several small round nucleoli. The significance of these nuclei is unknown. The optic lobes (pl. 20, figs. 22 and 23) are first seen as ro...


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Product Details
  • ISBN-13: 9781130225501
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 113022550X
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr

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