Nihon D Butsugaku Ih Volume 1

Nihon D Butsugaku Ih Volume 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...eye works its way across the head, we eventually get the right eye entirely over to the left side. It has now, by a movement of translation and of rotation, penetrated through the tissues between the base of the dorsal fin and the frontal bone; having apparently passed through the head, as was suggested to Steenstrl'i'. by bis examination of the alcoholic specimens which furnished him the materials for his paper.on Plcu/usia." In the present flat-fish, the dorsal fin also grows forward before the rotation of the right eye, but this anterior extension does not unite with the head, and there is a distinct hole bounded by the head and the anterior extension of the dorsal fin, for the passsge of the right eye, which travels round the dorsal side of the head without sinking into its tissues. The orbit of the right eye travels also with the rotation of the head from one side to the other, as in the case of a number of flatfishes. Now if we compare this mode of the passage of the eye with the first mode described by Agassiz, which is undergone by a majority of flat-fishes, we find little difference between them, beyond the fact that before the rotation of the eye takes place, the dorsal fin grows in our specimens forward to the snout and lies in apposition with the head. If, on the other hand, the anterior extension of the dorsal fin should coalesce with the head and the hole should be obliterated before the rotation of the right eye, there would be nothing for the latter to do, except to have a hole for its passage pierced through anew, in the spot where the hole is present in our specimen. And this is what takes place in Agassiz's second mode as observed in Amoglossus by Ehrenbaum, and in Plagusia by Agassiz, although in the last genus...
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Product details

  • Paperback | 52 pages
  • 189 x 246 x 3mm | 109g
  • United States
  • English
  • black & white illustrations
  • 1236746554
  • 9781236746559