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IV.—Jurassic Ammonites: Notes on a Pamphlet by Professor Guido Bonarelli2

Published online by Cambridge University Press:  01 May 2009

S. S. Buckman
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Extract

Italian geologists have made several valuable contributions to our knowledge of the Jurassio strata of their country. Unfortunately some of their works are not known here as they deserve to be, and seem difficult to obtain. At the same time I have to acknowledge with thanks the receipt of some valuable memoirs which have been of particular service; and one of the latest arrivals is the present pamphlet.

Type
Original Articles
Information
Geological Magazine , Volume 1 , Issue 7 , July 1894 , pp. 298 - 300
Copyright
Copyright © Cambridge University Press 1894

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Footnotes

2

Osservazioni sul Toarciano e l'Aleniano dell' Apennino centrale. Boll. d. Soc. geol. italiana, vol. xii. fasc. 2, pp. 195–254. Rome, 1893.

References

page 298 note 1 Fanne du Calcaire Carboniftre de la Belgique (Annales du Mus. Eoy. d'Hist.nat. de Belgique, vol. ii.), part i. 1878, p. 115, pl. xxiv. ff. 2a, b.

page 299 note 1 I propose this name as a sort of colloquial word, congruous with Ammonites, Ceratites, Goniatites, etc., to distinguish those genera which are certainly not true Ammonites, either in characters or hy descent, namely, Lytoceras, Pleuracanthites, Phylloceras, Monophyllites, etc. They are characterized by the phylliform cells of the septa, and probably by the absence of any calcareous Aptychus or Anaptychus. Lytoceratites are biologically lower than Ammonites, though they are collateral and coeval. They were separated by Hyatt (Genesis Arietidæ, p. 4) as Lytoceratinœ; but this places Lytoceratinœ superior to Lytoceratidœ, whereas it should be of inferior rank. The terms Lytocerataceœ and Ammonacece (the latter used many years ago) might indicate Lytoceratites and Ammonites respectively, and be subdivisions of Ammonoidea.

page 299 note 2 “Genetic Relations of Stephanoceras,” Proc. Boston Nat. Hist. Soc. vol. 18, p. 386, 1876.Google Scholar

page 299 note 3 Hyatt, , op. cit. p. 368 (E. B. Tawney's information).Google Scholar