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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

Whatever may be the precise biological value of this genus or subgenus as distinct from Purpura, it forms a remarkable group, limited, according to our present knowledge, both in time and space. Of the conditions favourable to its development we only obtain glimpses here and there. In the Coral Rag of Yorkshire one would say that the genus displays a remarkable tendency to variability within certain limits, so much so that almost every specimen found in anything like a decent state of preservation differs in some point of ornament: hence the extreme difficulty of specific arrangement. One might almost suppose that, like the Ammonite, the genus having worked out the limits of possible change, flourished within a short period only, and speedily became extinct.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 7 , July 1880 , pp. 289 - 298
Copyright
Copyright © Cambridge University Press 1880

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References

page 289 note 2 Mollusca of the Great Oolite, p. 25.

page 289 note 3 Bull. Soc. Linn. Norm. vol. v p. 119.Google Scholar

page 290 note 1 Op. cit.

page 290 note 2 Plates v. and vi.

page 290 note 3 Stat. Geol. etc. de la Meuse, p. 44.

page 293 note 1 Purpuroidea, sp.—Not figured or described. A specimen distinct from any of the previous forms was found by me in the Coral Rag of Langton Wold. It has an extremely wide aperture, which impinges on the columellar area. The condition of the shell is not favourable for judging of the ornamentation, and I merely draw attention to the existence of a form which may some day be found in a better state of preservation.

MurexHaccanensis, Phillips.—There being no certain evidence that this is a Corallian form, it is not included amongst the Corallian Gasteropods.

page 294 note 1 Yorkshire Oolites, pt. ii. sec. 2.

page 295 note 1 Obere Jura.