Contributions to Biology from the Hopkins Seaside Laboratory of the Leland Stanford Jr. University Volume 26-30

Contributions to Biology from the Hopkins Seaside Laboratory of the Leland Stanford Jr. University Volume 26-30

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ensues. After specimens have been kept under observation for some time the rate changes and several minutes may be required for the moulding process. It is a common occurrence in E. squamula that the secretion of the shell glands ceases an hour or two after individuals have been removed from the host, and the yolk and ova are blown like dust from the mouth of the genital atrium. VII. EXCRETORY SYSTEM. In living individuals, especially those which are small and transparent, the flame or terminal cells of the excretory system may be seen distinctly. This is notably the case with those located in the superficial tissues of the pharynx. They possess an irregular stellate form (figs. I5, I6), the processes extending from the cell-body a short distance into the surrounding tissues, and almost invariably the main body of the cell contains from one to eight vacuoles filled with a transparent fluid. In some cases, when the animals have been allowed to remain for some time in a small quantity of water, these may unite into one large droplet, which frequently distends the cell to an almost spherical form. At the point of union of the terminal cell and the capillary tube with which it communicates the former is indented, and from the base of this depression a slender cilium arises, whose rapid vibration drives a transparent fluid, containing a few highly refractive granules, down the tube. Throughout the first part of its course the walls of the latter are relatively thick, and the lumen pursues a very wavy course, becoming more direct after several such canals have united into a larger tubule. The products which these tubes convey are finally discharged into the main canals, two in number, which traverse almost the entire length of the animal...
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Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • United States
  • English
  • black & white illustrations
  • 1236959280
  • 9781236959287