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Home > History and Archaeology > History > Observations on Polyzoa; Sub-Order Phylactolaemata with Nine Plates
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: ...is filled with a colorless fluid which is kept in circulation by the cilia on the epithelial membrane. They cover the entire surface of the endocyst, including the'ceiling of the lophophore; but, as previously observed by Professor Allman, do not occur upon the alimentary canal. There are two principal currents maintained in each polypide by these cilia, one passes posteriorly along the dorsal side, enters the arms, and, being deflected upon itself at their extremities, courses along the ceiling of the lophophore, and returns to the ccencecium along the ventral side. These currents can be readily observed by the aid of the numerous organisms, many of them probably parasitic, which float in the fluid, sometimes in such numbers as to interfere with the examination of the inter nal structures. The intimate composition of the circulatory fluid is not accurately known, although supposed by Prof. Allman to consist mainly of water charged with the chyliferous exudations of the alimentary canal. This is the most reasonable view, though it is not known by what means the water enters the ccencecial cavity. Prof. Allman observed, that the ccencecium of Lophopus and Cristatella readily emptied themselves when taken out of water, and I have observed the same phenomenon in Plumatella vitra, which like Lophopus has a soft ectocyst. The ccencecia of these species, when exposed for any length of time, shrink to an almost imperceptible film, but upon being again returned to the water they expand to their former dimensions. The dessication must have been occasioned by the flow of fluid through the pores of the ccencecial endocyst and the superincumbent ectocyst, since all the polypides were closely retracted. These facts show, that it is not necessary to look for an explanati...


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Product Details
  • ISBN-13: 9781130921694
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1130921697
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr

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Observations on Polyzoa; Sub-Order Phylactolaemata with Nine Plates
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