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An Introduction to the Study of Fossils (Plants and Animals)

An Introduction to the Study of Fossils (Plants and Animals)


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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. 1921 Excerpt: ...into the cesophagus. The peculiar mechanism which accomplishes this withdrawal of the mouth is called an introvert; it works like the pulling in of the finger of a glove by a thread from within. During its invagination the wall of the digestive canal is folded twice on itself, thus pulling inward its anterior extremity, the mouth. During evagination this fold partially straightens out and the mouth is thus pushed out to occupy an anterior position. The mouth leads into the buccal cavity, an enlargement of the digestive canal which in turn opens into the cesophagus. The muscular walls of this cavity bear the apparatus for mastication, two small chitinous jaws or mandibles, and the radula, a thin membranous ribbon bearing transverse rows of many tiny chitinous teeth. The radula is borne on a cartilaginous support, --the odontophore, furnished with protractor and retractor muscles by whose action the radula may be sent out through the mouth and may work to and fro like a rasp upon the animal's prey. The extrusion of the mouth through the agency of the introvert carries with it likewise the buccal cavity with its included radula, thus placing the animal in position for feeding. Into the buccal cavity open the salivary glands which secrete a simple mucus with little or no digestive action. Food passes from the buccal cavity through the cesophagus to the stomach, a simple enlargement of the digestive canal. The liver is a soft brownish mass, more or less completely surrounding the stomach and forming a large part of the coiled mass of viscera. It is the chief organ of digestion, secreting a ferment which it pours into the stomach. From the stomach the food enters the intestine through whose walls the digested food is absorbed and from whose posterior extremity the...


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Product Details
  • ISBN-13: 9781152976528
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 142
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1152976524
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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