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Proceedings of the Royal Physical Society of Edinburgh

Proceedings of the Royal Physical Society of Edinburgh


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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: Observations.?Apart altogether from the nephridia, it is necessary to include these families in one group: they are in every case so closely connected. The more typical Perichae- tidae seem sharply marked off from any others, but Deino- drilus is an almost exactly intermediate form between Perichceta and AcanihoArilus. It has more than eight setae in each segment, and a clitellum like that of Perichceta. The male reproductive apparatus is like that of Acanthodrilus, but in P. stuarti of Bournel?a form which I have ventured to distinguish generically?we have also four tubular atria. Moreover, in Perichceta ceylonica there are indications of an approach to Acanthodrilus, though that species requires further investigation. With regard to the Cryptodrilidae,3 such a form as Ponto- drilus is very distinct from Perichceta, and in the absence of any knowledge of intermediate forms would have to be separated into a very distinct family. This has been done by Vejdovsky; but, at the time when he wrote, the two genera Microscolex and Photodrilus, as well as the Australian genera described by Fletcher,5 were unknown. These form collectively a family, which is chiefly defined, however, by negative characters. I exclude from thisfamily Eudrilus and Teleudrilus, about which something will be said presently. This family is, however, closely connected with the Perichsetida?, through the remarkable genus Anisochaita made known by Fletcher. In this form, which I regard as distinct from Perichecta, the setae of the first few anterior segments are eight in number in each segment; afterwards they increase until the normal perichsetous condition is reached. This genus connects the two families in the only direction in which any connection is at all necessary. Apart from the setae, it is absolutel...


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Product Details
  • ISBN-13: 9780217534536
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 152 mm
  • No of Pages: 364
  • Spine Width: 21 mm
  • Width: 229 mm
  • ISBN-10: 0217534538
  • Publisher Date: 07 Feb 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 531 gr


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