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The Cytogeny of P O D A R K E O B S C U R a (Verrill)

The Cytogeny of P O D A R K E O B S C U R a (Verrill)


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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. 1901. Excerpt: ... Conklin further distinguishes between cell and regional homology, the latter appearing, for example, between annelids and gasteropods on the one hand, and the ctenophores on the other. Further, if I understand him correctly, although he gives no formal definition, he would distinguish between complete and incomplete cell homology. I am able to see very little distinction to be logically made between an incomplete and a regional homology, and it seems to me a clearer definition of cell homology is to be desired. If cell homology is the resemblance which exists between two organs whose Anlagen are merely similar and not identical in origin, I have no objection to the use of the term in recent writings; but it seems to me very little distinction can be made between this and regional homology, and I see no reason why, using this definition, all homologies are not cell homologies. The phrase "incomplete cell homology" is to me a contradiction of terms. I have no desire to split hairs over a mere definition, and it may be that the term is convenient and should be retained (for example, to designate an homology between two organs, not determined by adult structure alone, but by a similarity in cellular origin as well). At the same time it seems to me desirable to emphasize the distinction between the complete and the incomplete, as the hasty reader of many recent celllineage papers would, I think, be in danger of carrying away too exaggerated a notion of the number and importance of the former. To this point I shall return. Wilson, in a paper already quoted, has reinvestigated the platode cleavage, and has shown that although the cleavage in its general character agrees perfectly with the annelid and gasteropod, yet the mesoblast, precisely as described by Lang ...


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Product Details
  • ISBN-13: 9781151371850
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1151371858
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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