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Observations on Polyzoa Sub-Order Phylactolaemata with Nine Plates

Observations on Polyzoa Sub-Order Phylactolaemata with Nine Plates


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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. 1868 Excerpt: ...sac beneath. The alimentary canal has a simple, dorsal flexure, the anus opening on the dorsal side near the mouth. Animal compound; nervous system compound, each zooid furnished with two large dorsal ganglia; principal muscles distributed in pairs on either side, attached posteriorly to the alimentary canal and lophophore, and anteriorly to the walls of the reproductive region; circulation unconfined by special vessels; reproduction takes place by buds and by the ova. Many malacologists consider the Polyzoa more nearly related to the Ascidia than to the Brachiopoda. The class characters of the Brachiopoda, however, and the special homologies, which may be traced between the organs of a Brachiopod and those of a Polyzooid, show closer affinities than exist between the last and an Ascidiian. The higher Brachiopoda, such as Terebratula and Bhynconella, have the respiratory tentacles similarly situated around the disk, or lophophore, which is perforated at the centre by the mouth, and from which the alimentary canal hangs in the visceral sac beneath, the mouth and anus approximate, the canal having a dorsal flexure. The extension of the lophophore into two or three spiriform arms, the complex structure of the tentacles and The existence of a complete nervous collar is doubtful. of the muscular and nervous systems are all more or les s foreshadowed by the condition of these systems among the higher Polyzoa. Hancock, in his admirable memoir on the structure of the Brachiopoda, has described with great clearness the different steps in the complication of the arms. Beginning with their simplest aspect in Fredericella, and tracing them to Plumatella, he shows, that, if the tentacles of the latter were approximated, forming a double line on one side, and the arms el...


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Product Details
  • ISBN-13: 9781130762433
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130762432
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr

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