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The Apodida; A Morphological Study

The Apodida; A Morphological Study


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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. 1892 edition. Excerpt: ...shell as a fold of the tergum of the fifth segment developed to carry thorns for the protection of the exposed dorsal surface, the head being bent round ventrally. A Trilobite, Acidaspis Dufrenoyi (Fig. 48), shows us the neck-lobe developed into the kind of thorn-carrying fold we had imagined. Such a fold as that possessed by Acidaspis, if a little wider and carrying more thorns, could very easily develop backwards over the trunk into a shell fold, such as that possessed by the Apodidae, the thorn-carrying function eventually giving way to that of forming a cover for the dorsal surface. But this is not the only form of shell which can be derived from the primitive head-shield above described. The bivalve shells of the Ostracoda can also be deduced from the same by the clapping together of the two wings of the crescent-shaped ridge against the sides of the body as illustrated in Fig-57, P-257. When this crescent is large, owing Fig. 48.--Acidaspis Dufrenoyi (Barr), Upper Silurian (after Barrande, from Zittel's Handbnch). Showing the fold of the skin carrying two prongs projecting backwards just behind the glabella, to demonstrate the probable origin of the dorsal shield of Apus. to the great development of the shovel-shaped ridge round the front of the head, the lateral folding of these wings round the rolled-up body would yield a bivalve shell. Another obvious method of producing the bivalve shell is by the folding down of the edges of a dorsal shell such as that of Apus. These two origins arc, however, clearly quite different; we shall find later that they help us greatly in understanding the striking difference between the Ostracoda and the other Crustacea possessing bivalve shells. In the meanwhile the development of shells directly...


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Product Details
  • ISBN-13: 9781150325489
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 100
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150325488
  • Publisher Date: 05 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr

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