Memoir Volume 7

Memoir Volume 7

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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. 1904 edition. Excerpt: ...and equally separated points of branching and the strong development of the lateral branching. All these features give to the group a uniform habit quite distinct from that of the other graptolites. dichotomous branching as one of the distinctive characters of Temnograptus. That in T. multiplex the branching is indeed monopodial liecomes evident in Nicholson's and Elles's drawings, which show that one of the branches resulting from the division follows the curvature of the mother branch, while the other alone assumes a new direction. Only the branches of the first order divide dichotomously; and it is hence probable that no difference can be found between this and Holm's genus Trochograptus, as according to Elles's table p.478 the mode of branching constitutes the only difference between the two. We believe, for these reasons, that Clonograptus milesi and Temnograptus multiplex belong to quite different series of the dichograptids. Of the above named genera, Temuograptus shows still in its branching the nearest approach to the original dichotomy, the others possessing mostly a more distinctly lateral mode of branching, and it also has still the greatest number of orders of branches; hence it seems to be nearest to the ancestral Clonograptus forms, and therefore may have been the radicle of the others. In the American graptolite beds this group, which in Europe is well developed, is but poorly represented. A single other species besides the form here described has become known, viz Holograptus richardsoni, from the Quebec beds. Temnograptus noveboracensis sp. nov. Plate 5, fijfures 15-20 Temnograptus cf. m u 1 ti p 1 e x (Nicholson) Kuedemann. N. T. State Paleontol. An. Rep't. 1902. p.556. In graptolite bed 2, representing the upper more

Product details

  • Paperback | 116 pages
  • 189 x 246 x 6mm | 222g
  • United States
  • English
  • black & white illustrations
  • 1236751469
  • 9781236751461