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Home > Art, Film & Photography > Phoronis Architecta Volume 10, PT. 4; Its Life History, Anatomy and Breeding Habits
Phoronis Architecta Volume 10, PT. 4; Its Life History, Anatomy and Breeding Habits

Phoronis Architecta Volume 10, PT. 4; Its Life History, Anatomy and Breeding Habits


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About the Book

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. 1905 Excerpt: ...were stained with iron hematoxylin. Our work has been done with very high powers (Zeiss obj. r'4 and No. 12 Zeiss compensating occulare). The nephridia of the two Actinotrochx have much the same structure, but in Species A. we have been unable to find that the internal end of the nephridial canal branches, while in Species B. the internal end divides into two short branches. Figs. 52, 52a, 52b represent thi-ee transverse sections through the anterior part of the nephridium of Species B. Fig. 52 is through the nephridial canal just posterior to its internal end. Darkly staining dots seen in the lumen represent cross sections of long fiagella such as Goodrich ((!) has described in the "adenocytes" of Amphioxm. Fig. 52a shows a section through the nephridial canal a few sections anterior to that of fig. 52, and at the same time it shows the lower or most posterior branch with a few excretory cells and their processes. In fig. 52/, which is a section through the tip of the upper or anterior branch of the nephridium, the lumen of the nephridial canal is reduced to a very small clear space. If a section is taken in a longitudinal direction through the nephridial canal and its excretory processes (fig. 52/), it is seen that the distinct walls of the nephridial canal disappear when the "bouquet" of excretory cells is reached, but that the end is blind and that it is merely a thin walled bulb from whose surface radiate the processes of the excretory cells. The structure of these processes is the same in both species that we have examined except that in Species A. they are much shorter, which might account for the different descriptions we find in the literature. We are convinced that in both species the excretory processes contain lumens, that th...


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Product Details
  • ISBN-13: 9781231037607
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1231037601
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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Phoronis Architecta Volume 10, PT. 4; Its Life History, Anatomy and Breeding Habits
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