Memoir on the Fossils of the Older Deposits in the Rhenish Provinces, Preceded by a General Survey of the Fauna of the Paleozoic Rocks, and Followed by a Tabular List of the Organic Remains of the Devonian System in Europe

Memoir on the Fossils of the Older Deposits in the Rhenish Provinces, Preceded by a General Survey of the Fauna of the Paleozoic Rocks, and Followed by a Tabular List of the Organic Remains of the Devonian System in Europe

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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. 1842 edition. Excerpt: ...forming a very elongated cone, covered with rounded, slightly prominent, regular, oblique striae, crossing the suture of the septa at a very acute angle. These striae, of which the impression is seen upon the cast itself, belong to the inner lamina of the shell, which is entirely destroyed. Edge of the septa simple. In the anterior part of the shell, which is all we possess, these septa are very close, and five may be counted in the height of one diameter. Siphon rather large, elliptical and touching the edge. The peculiar disposition of the striae is sufiiciently characteristic of this species. It is true, the Orthocera undulata, Min. Conch., Tab. LIX., presents folds oblique to the axis, but they are much larger, less numerous, and inclined in the same direction as the septa. The siphon, moreover, is submarginal. In the O. subtrochleatus and O. carinatus, loo. cit, of Miinster, Taf. XIX. f. 6, 8, the siphon is submedian and median, and the folds are undulated, instead of being straight as in the O. Dannenbergii. There is found in the iron mines of Brilon a transversely striated species which bears the greatest analogy with this. It is with pleasure we dedicate this species to M. Dannenberg who has so powerfully contributed by his assiduous researches to make known the Palaeontological riches of the Duchy of Nassau. Wissenbach; rare. 8. Orthocemtites Ibex, Murch. Sil. Syst. Pl. V. f. 30. This species does not appear to us to differ essentially from the O. articulatum (Pl. V. f. 81) of the same author, of which the ribs are perhaps more rounded, nor from the O. annuhztus of Hisinger (Lethaea Suec., Tab. IX. f. 8), which is really the same as the O. armulata of Min. Conch., Tab. CXXXIII., for the obliquity of the rings is in most cases...show more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236826167
  • 9781236826169