Budding in Compound Ascidians Based on Studies on Goodsiria and Perophora
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Budding in Compound Ascidians Based on Studies on Goodsiria and Perophora

Budding in Compound Ascidians Based on Studies on Goodsiria and Perophora


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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. 1896 Excerpt: ...stated by quoting what I have already said in my preliminary paper: "When the differentiation of the 'endoderm' into the branchial and two peribranchial sacs takes place, it does so in such a way that the developing blastozooid is connected with the double-walled partition of the stolon, not by the branchial sac, as has been hitherto supposed, but by the left peribranchial sac" Figs. 57-64, and 65, 67, and 70, PI. XVI, will suffice to illustrate the facts. Of these Figs. 67 and 68 are from the youngest stage. At this time the inner vesicle is still almost a perfect sphere, no differentiation of organs having yet begun excepting that a mere trace, pca., of the heart is present. The connection of the inner vesicle to the stolonic septum, cl'n., does not show in his section, but it does in the third section of the series preceding this. The bud at this time does not stand out at a right angle to the stolon, but is inclined somewhat toward its tip. The series passes from the posterior, or point of attachment of the bud, toward its anterior, i.e. toward the tip of the stolon. It is for this reason that we find the section of the stolonic septum in several sections before we come to its place of attachment to the inner vesicle. The process by which the vesicle becomes divided up into the branchial and two peribranchial chambers differs so little from the same process in Goodsiria and various other Ascidian buds, that I have thought it would be sufficient to pass over the various stages excepting those that pertain especially to the condition about to be described. It is, however, necessary to refer to the account given by Lefevre of the first stages in the differentiation of the vesicle. He states that in P. viridis the inner vesicle rotates to the righ...


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Product Details
  • ISBN-13: 9781236419255
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1236419251
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr

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