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Quarterly Journal of Microscopical Science (Volume 20)

Quarterly Journal of Microscopical Science (Volume 20)


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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: On the Development of the Spermatozoa. Part I. Litmlricus. By J. E. Bloomfield, B.A. Oxon. With Plate VI. The investigation into the structure of the testis and the development of the spermatozoa, of which the present chapter on Lnmbricus is an instalment, was undertaken at the suggestion and with the kind supervision of Prof. Lankester, and has been carried out partly in the laboratory of Exeter College, Oxford, partly in the new zootomical laboratories at University College, London. The true Testes of the earth-worm were first described by Hering (' Zeitschr. fiir wiss. Zool., ' vol. viii), who did not, however, figure them in position. They occupy much the same position in the tenth and eleventh rings of the body as do the ovaries in the thirteenth; that is to say, they are placed in pairs in those rings well forward, so as to be in relation to the anterior septal wall and near the neural median line. Each testis is a pure white, translucent body, of irregularly quadrangular form, rarely more than -rVth of an inch in diameter, much flattened, and attached by one side to the ccelomic epithc- my/i lium, of which it appears to be a local modification. The position of the testts is seen in the diagram woodcut. Each testis consists of a mass of spherical cells (Plate VI, fig. 1), those at its free edges tending readily to separate and fall into the coelomic space or body cavity. These readily separated cells have, moreover, often advanced in development beyond those which lie more deeply in the mass, and have attained the condition of spermospheres or sperm-polyplasts described below. I have not been able to determine the line of demarcation between ccelomic epithelial cells of the ordinary kind and those which build up the substance of the testis. There does not appear t..


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Product Details
  • ISBN-13: 9780217538503
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 202
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 0217538509
  • Publisher Date: 03 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 372 gr


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