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II.—Contributions to the Palæontology of the Yorkshire Oolites

Published online by Cambridge University Press:  01 May 2009

Wilfrid H. Hudleston
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Extract

Several trochiform shells found in the Jurassic rocks, which were formerly referred either to Trochus or to Solarium, have in more recent years been regarded as related to the genus Onustus. I am not aware who was the first author to adopt this view, but we find Hébert and Deslongchamps (1860) recognizing the genus in the Callovian of Montrueil Bellay. Subsequently Lycett (Suppl. to the Great Ool. Moll. p. 103) gave a diagnosis, more especially as applicable to the Jurassic species, and described Onustus Burtonensis from the Forest Marble of Burton Bradstock.

Type
Original Articles
Information
Geological Magazine , Volume 1 , Issue 7 , July 1884 , pp. 293 - 303
Copyright
Copyright © Cambridge University Press 1884

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References

page 293 note 1 Some might be disposed to think that the fossils classed by Deslongchamps and Lycett under Onustus present more resemblance to such modern genera as Calcar and Uranilla.

page 296 note 1 The fact that the Ancliff Oolite was supposed to be of Great Oolite age may have had something to do with the unwillingness of some excellent authorities to recognize the relationship of Natica tumidula to Nerita minuta. Although I have made numerous inquiries, I have never been able to obtain any very satisfactory account of the beds whence Sowerby obtained his “Ancliff“ fossils, mostly, I believe, either micromorphs or very small species.

page 298 note 1 D'Orbigny, Terr. Jurass. p. 231, gives the following extraordinary synonymy:

Nerita minuta, Sow. 1824.

Nerita costata, Sow.

Nerita costulata, Desh.

Neritina Cooksonii, Deslong. p. 133, pl. 10, figs. 8 and 9.

page 298 note 1 Since the three specimens figured were all attached to a card, it was thought best not to interfere with this arrangement. The dimensions refer to Figure 7, which is slightly the largest.

page 302 note 1 To be figured and described in the next part of this Memoir.