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III.—Contributions to the Palæontology of the Yorkshire Oolites
Published online by Cambridge University Press: 01 May 2009
Extract
Shell conical, moderately long, with perhaps a rudimentary umbilicus. The complete spire would consist of about 10 whorls, which increase under a regular angle. The surface of the apical whorls in this specimen is not well preserved, but the five anterior whorls are in good condition; they are smooth, somewhat tumid towards the centre, and separated by a suture of moderate depth. Wavy longitudinal lines, apparently lines of growth, are observed, but there is no trace of any other ornament. Base of body-whorl smooth and almost polished, except where there has been a decortication of the outer layer of shell. This decortication, besides affecting a considerable area near the outer lip, has formed a belt in the posterior region of the base, thus producing a sort of false carination. In this way we learn that both inner and outer layers of shell were of considerable thickness. (N.B.—The shell is now mainly in the condition of spathic iron, coated and coloured with brown oxide).
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References
page 109 note 1 See Yorkshire Oolites, pt. i. Proc. Geol. Assoc. vol. iii.Google Scholar
page 109 note 2 Judd, Geology of Kutland, p. 282.Google Scholar
page 109 note 3 From the Q. J. G. S. vol. xvi. pp. 11 and 13.Google Scholar
page 109 note 4 First noticed and described by Lycett in 1857. See his “Cotteswold Hills.“
page 110 note 1 Op. et vol cit. p. 179.
page 113 note 1 The type specimen, figured both by Phillips and Lycett, should be in the Scarborough Museum, but I have never been able to see it. Nor have I ever been able to see a specimen of this very scarce species until quite lately, when I discovered a fragment ¾ inch in length in the Jermyn Street Museum. The apical portion is entirely gone, but five well-preserved anterior whorls, in a most undoubted Cornbrash matrix, are sufficient to show that this is the species figured and described by Lycett from Phillips's type specimen. Lycett' figure is 1¼ inch long, and shows eight whorls, whilst Phillips's figure is nearly 2 inches long, and shows thirteen whorls. Hence the available specimens have been continually getting shorter.
page 114 note 1 See Corallian Gasteropoda.