The Evolution of the Vertebrates and Their Kin - Bookswagon
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The Evolution of the Vertebrates and Their Kin

The Evolution of the Vertebrates and Their Kin


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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. 1912 Excerpt: ...are covered with a single layered blastoderm on one side, while the opposite side was still occupied by large yolk spheres. In many cases, the blastoderm, spreads over the opposite side of the egg in an advancing fold, the uncovered yolk either protruding from the opening, or lying a little below the general surface. The uncovered area is usually circular, but it may be quite irregular, and varies in size from an opening one-third the diameter of the egg to that of a pin hole. (Fig. 126, h.) The yolk plug thus produced has nothing to do with the formation of germ layers. It resembles the condition seen in the early stages of certain ganoids, cyclostomes, and other fishes, but it has no parallel, to my knowledge, in the invertebrates. On the eighth day, a single layered blastoderm covers the entire egg, enclosing numerous nucleated yolk spheres. Comparison of Arachnids and Vertebrates.--The cleavage in the arachnids presents an interesting intermediate series of stages between the typical centrolicithal type of insects and that of the lower vertebrates. In Limulus, there is a distinct approach toward the partial cleavage of the amphibia and cyclostomes. In Telyphonus (Schimkewitsch), the form of the blastomeres, and the size and location of the resulting segmentation cavity are very similar to the corresponding structures in the frog's eggs. In the scorpion, which possesses one of the largest eggs among the arthropods, all the early divisions take place on the surface of the yolk (Brauer), producing a typical meroblastic cleavage, and a small sharply defined blastodisc very similar to that in the teleosts. In many insects and spiders, the early divisions take place in the interior of Fig. 123.--A, Surface view of the blastoderm and primitive cumulus of Limul...


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Product Details
  • ISBN-13: 9781152903548
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 196
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1152903543
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 358 gr


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