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VI.—On the Carboniferous Nautiloids: Orthocera gigantea J. Sowerby and Allied Forms

Published online by Cambridge University Press:  06 July 2012

J. Selwyn Turner
Affiliation:
Lecturer in Palæontology, University of Leeds.

Synopsis:

The type material of Orthocera gigantea J. Sowerby 1819 is refigured and redescribed. Specimens referred to this species by J. Phillips, J. Fleming, F. McCoy and F. S. Wallis have similarly been reinvestigated. The counterpart of the type of Actinoceras simmsii C. Stokes 1840 is also illustrated. Numerous other specimens from England, Scotland and Ireland have been studied. The material is found to be referable to the genus Rayonnoceras Croneis and to embrace a number of species. The calcification of the siphuncular structures is found to be variable in this genus.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1952

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References

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