Bulletin of the Museum of Comparative Zoology at Harvard College Volume 58
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Bulletin of the Museum of Comparative Zoology at Harvard College Volume 58

Bulletin of the Museum of Comparative Zoology at Harvard College Volume 58


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...rather to a retardation of the longitudinal growth of the cephalon, during the process of widening. The pygidium never becomes quite as wide as the cephalon, so that more energy can be put into longitudinal growth. Glabella and axial lobe of the 'pygidium.--The glabella soon loses its convexity and prominence, as well as its furrows, basal lobes, and median tubercle. These features are still visible on a cephalon 4.5 mm. long, but are faint, and the front of the glabella no longer rises abruptly from the brim. The outline of the glabella is still distinguishable on a cephalon 7.5 mm. long, but it is there hardly more convex than in the adult. Something of the form of the glabella can be made out on most specimens, whatever the size, but it is rather smoothly merged into the general surface of the cephalon in all specimens with a cephalon more than 8 mm. long. The axial lobe of the pygidium remains convex and conspicuous somewhat longer than the glabella does. On a specimen 9.5 mm. long, where the glabella is quite flat, the axial lobe of the pygidium is prominent, even at the posterior end, which rises abruptly from the flattened border. It would be expected that the pygidium would retain its youthful characters longer than the cephalon, for it is really younger, and has had less time to change. On a specimen 18 mm. long, (pygidium 5.5 mm. long), the axial lobe is fairly prominent, but does not extend quite to the border, and is less convex throughout its length than in the smaller specimens. It is of course, more or less distinguishable on specimens of all sizes, but is very faint on pygidia more than 25 mm. long, except under certain conditions of preservation. The axial lobe also grows shorter as the shell increases in length. In young...


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Product Details
  • ISBN-13: 9781154651331
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 148
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1154651339
  • Publisher Date: 01 Apr 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 277 gr


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Bulletin of the Museum of Comparative Zoology at Harvard College Volume 58
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