Proceedings of the Royal Society of Victoria Volume 10-12

Proceedings of the Royal Society of Victoria Volume 10-12

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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: ...filamentous cells. I have considered the probability of these cell-nests being germinative centres containing young cells of the epithelium which over--arches them, but their dissimilar appea.ra.nce as they reach maturity, their greater number than the cylindrical cells, and also their position in relation to them, has convinced me of the improbability of such being the case. The Terminal Canal. This is joined to the posterior extremity of the caeca, and after describing several round turns in the body-cavity, ends at the anus. It is necessary on account of structural differences to divide it into fore-, mid-, hind-, terminal canal, and rectum. Except Cuenot, other writers have considered the mesodermal middle intestine to extend as far back as a little anterior to the entrance Of the duct of the Malpighian vessels, and although this is so, I believe, in other of the Orthoptera, in Gryllotalpa there is no reason for so doing, for there is no marked differentiation of the cell-wall at this part. The musculature, however, changes sl""'Pl.Y which gives an altered appearance from the outside. Further, the outer and inner muscle layers are both striated, Which is not in accord with Professor Pn.ckard's description of the histology of the midil1testine,1 and there extends a chitinous imima throughout the whole of the passage.2 The muscles surrounding the wall are reversed in order con1pared with the anterior canal, so that the longitudinal fibres are outside the flrmular muscles. The Fore-Terminal Canal. This is 4 mm. long, and is surrounded by a thick layer Of annular muscles, "ith the exception of a small anterior portion 1 Lu cu. p. 816. 1 Lac. an 1: . 302. Its wall is thrown into deep longitudinal folds, more

Product details

  • Paperback
  • 189 x 246 x 11mm | 386g
  • English
  • Illustrations, black and white
  • 1236824202
  • 9781236824202