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I.—Contributions to the Palæontology of the Yorkshire Oolites1

Published online by Cambridge University Press:  01 May 2009

Wilfrid H. Hudleston
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Extract

There is no positive evidence that any species of Nerita has been found in the Corallian Rocks of Yorkshire. It is true that Nerita lœvigata, Sow., is quoted by Phillips (G. Y. 1875, p. 258), but this fossil is well known to be a Monodonta, and it is doubtful if the exact form occurs on this horizon (see postea, Turbo Erinus). The same author also quotes “Nerita bullata” as occurring in the Coralline Oolite. I can find no reference to this species, and am at a loss to understand what fossil is intended to be thus designated. There are casts in the Coral Rag of North Grimston which may belong to a species of Nerita.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 2 , February 1881 , pp. 49 - 59
Copyright
Copyright © Cambridge University Press 1881

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References

page 49 note 2 Of. Dr.Woodward, , in Geol. Mag. for 1879 p. 545.Google Scholar

page 50 note 1 As one of the characteristic features of Neritopsis is held to be the notch at the columellar lip, it might be objected that, in the case of this specimen, no such notch is shown. A similar objection may be urged in the case of all D’Orbigny's figures in the Terrains Jurassiques. Two reasons may be adduced for this. Firstly, the columellar notch may not have been so strong in the Secondary as in the Tertiary species. Secondly, it is quite certain that the presence of a hard matrix tends to obscure what should be the characteristic feature, and more complete development, where safe, might reveal the existence of the notch. In the very well preserved Tesson Collection, now in the New Natural History Museum, there is only one specimen of Neritopsis where the notch is visible. In this case the anterior portions of the inner lip are decayed away, but, as the aperture happens to be quite clear of matrix, we are able to see the entire cavity.

page 53 note 1 Since D’Orbigny (op. cit. p. 362) quotes from the Statistique géologique de la Meuse, it is clear that the date, 1850, prefixed to vol. ii. of the Terrains Jurassiques is incorrect.