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Home > Art, Film & Photography > Studies on Lepidosteus Volume 1
Studies on Lepidosteus Volume 1

Studies on Lepidosteus Volume 1


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: oxygenating function was the one first to be transferred; that, so long as the animal lived in the water, the gills were, under all ordinary circumstances, the customary channel for the elimination of carbon dioxide; and that finally, during the passage from water to land, this function was also imposed on the vesicular organ of the intestinal tract, which thus became a lung in the fullest sense of the word. IV. Embryology. The interesting accounts of the ontogeny of Lepidosteus given by A. Agassiz and by Balfour and Parker have put us in possession of important data concerning vertebrate development. It is hoped that a more extended study in this field will serve to answer some of the questions left unsettled by them, and will afford additional results of general value in discussions concerning the phylogeny of vertebrates. There would be some advantages in beginning the subject of the development of Lepidosteus with an account of the formation and growth of the ova. Although I have considerable material for a study of oogenesis, it has seemed to me better, on the whole, to defer a consideration of the topic until the close of that part of these studies which deals with organogeny, and to begin the description with the ovarian ovum as it exists at the time of oviposition. But I have deviated from the plan in the first part of the subject, ? the egg membranes, ? in order to give a more complete exposition of the structures which envelope the mature ovum. 1. Egg Membranes. The only account of the structure of the egg membranes of Lepidosteus is that given by Balfour and Parker ('81, p. 112, and '82, p. 362 and foot-note).1 It is as follows: They [the ova of Lepi- 1 Ryder ('85, p. 146) has since given the following brief account: In the ova of Ganoids, Amia an...


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Product Details
  • ISBN-13: 9780217059336
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 50
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 0217059333
  • Publisher Date: 08 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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