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A Manual of the Sub-Kingdom Protozoa; With a General Introduction on the Principles of Zoology

A Manual of the Sub-Kingdom Protozoa; With a General Introduction on the Principles of Zoology


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: CHAPTER HL POLYCTSTINA. I. Nature. ? 2. Distribution. i. Nature.? The name Polycystina was first given by Ehrenberg to a group of minute shell- bearing organisms, apparently allied to the Fora- minifera. They are usually of smaller size than the latter, from which also they differ in the nature of their shelly investment, the composition of which is siliceous. These shells are remarkable for the great beauty and variety of their forms, Fig. 5. Polycystina: ? a, Podocyrtis Srhomburgkii; b, Haliamma Humboldiii. and the peculiar appearance of the spine-like projections with which they are frequently fur- nished (fig. 5). The contained animal consists of an olive brown sarcode substance capable of protruding pseudopodia through the numerous foramina with which the shell is perforated. In those forms which have been most carefully examined, the sarcode body, which is divided into four equal lobes, does not fill the entire cavity of the shell, but would seem to be wholly confined to the upper portion of the latter. Of the true nature of these creatures, much has yet to be learned. 2. IMstributloTi. ? The Polycystina are very widely distributed. Their shells, mingled with those of Foraminifera and Diatomacece, have been ascertained to form part of the extensive organic deposit which is now being formed over a portion of the bed of the North Atlantic. They have been found also in the Mediterranean and various other parts of the existing ocean. They appear, however, to have been even more numerous at former periods, their remains having been already detected in both the secondary and tertiary formations. Nearly 300 apparently distinct forms of these animals have been discovered by Ehrenberg, in a tertiary deposit which occurs abundantly throughout an extensive distri...


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Product Details
  • ISBN-13: 9780217152006
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217152007
  • Publisher Date: 15 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 68 gr

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A Manual of the Sub-Kingdom Protozoa; With a General Introduction on the Principles of Zoology
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