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Quarterly Journal of Microscopical Science (Volume 19)

Quarterly Journal of Microscopical Science (Volume 19)


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Book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1879. Excerpt: ... die Vermuthung zu aussern, ob nicht vielleicht in den Nasengruben ein Paar solchen Spalten, freilicii in wesentlich veriinderter Function uud darum auch Structur, zu erkenneu sei."i Dr. Dohrn does not enter into any details concerning the suggestion thus made, and does not discuss the question of the olfactory nerve. I am not aware that he has since published any further observations on this point. The suggestion appeared to me, if not untenable, at any rate unprovable, so long as the ordinary account of the development of the olfactory nerve continued to find acceptance. In addition to what has been already said there are, I think, many arguments in favour of this view. Even if we leave out of consideration the buccal and lachrymal clefts, it is well known that in all vertebrates above Amphioxus more or fewer of the visceral clefts undergo modification to a greater or less extent, and that this modification is first felt by the clefts at the two extremities of the series, especially by the anterior ones; and it is a point worthy of notice that, while the posterior clefts tend simply to disappear, the anterior clefts with their gills are peculiarly prone to persist in a modified form. Thus, the first postoral or hyomandibular cleft is the only one which remains in Sauropsida and Mammalia. Among Ichtbyopsida this cleft is apt to assume the modified form of a spiracle, while its gill loses its respiratory function, and persists as a pseudobranchia. Similarly, the carotid gland of the frog and the choroid gland of Teleosteans are probably other instances of the persistence, in an altered condition, of anterior gills. On the other hand, when reduction is effected in the number of the gills from the posterior end of the series, as in nearly all fishes, the gills and their clefts usually d...


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Product Details
  • ISBN-13: 9781154281583
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 210
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1154281582
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 386 gr


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