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On New Carboniferous Gastropoda from the Isle of Man

Published online by Cambridge University Press:  01 May 2009

John Weir
John Weir
Affiliation:
Geological Department, University of Glasgow
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Extract

The fossils described in the following pages were collected by Mr. James L. Begg, The Elms, Mount Vernon, Glasgow, fromthe Poolvash Limestone, Balladoole, Isle of Man. The fauna of these limestones, according to Dr. Wheelton Hind, indicates an upper Dibunophyllum age. The most recent and most complete list of Carboniferous Limestone fossils from the south of the I.O.M. is that published by Mr. John Smith, and compiled from the Survey list, from Dr. Hinde's list, and from Cuming's list, as well as from Mr. Smith's own collection.

Type
Original Articles
Information
Geological Magazine , Volume 62 , Issue 10 , October 1925 , pp. 433 - 438
Copyright
Copyright © Cambridge University Press 1925

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References

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page 433 note 2 Trans. Geol. Soc. Glasgow, xiv, part 2, 1911, p. 149.Google Scholar

page 433 note 3 A stouter shell than Pt. pyramidalis; spiral angle 61°.Google Scholar

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page 435 note 2 As defined by Macdonald, and Trueman, , Quart. Journ. Geol. Soc., lxxvii, 1921, p. 302. The term “splral angle” is open to the objection that it is also used for the constant angle of a logarithmic splral, and has already been used in that sense by Dr. Trueman with reference to the splral coiling of Gryphaea (Geol. Mag., LIX, 1922, p. 260). “The splral angle” of a gastropod is not homologous with the angle which expresses the umbonal curvature of Gryphaea. Custom, however, probably justifies the retention of the term in the special sense of its application to gastropods.Google Scholar

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page 437 note 1 Maedonald, and Trueman, , loc. cit., pp. 306–307.Google Scholar

page 437 note 2 Loc. cit., vi, 1881, p. 84, pl. ix, figs. 32, 33.

page 438 note 1 De Verneuil, , 1845, Russia and the Ural Mountains, ii, p. 341, pl. xxiii, fig. 5.Google Scholar