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Studies in Avonian Brachiopoda: I. The Genera Brachythyris and Martinia

Published online by Cambridge University Press:  01 May 2009

T. Neville George
T. Neville George
Affiliation:
University College of Swansea.
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Extract

In 1844 M'Coy subdivided the genus Spirifer Sowerby into five groups, two of which, Brachythyris and Martinia, were characterized by “the presence of a hinge-line shorter than the width of the shell”. Brachythyris included forms “in which … the longitudinally-ribbed surface of Spirifera is united with the short hinge line of Martinia”. The latter included “the smooth spirifers”. M'Coy's subdivisions, however, have not been much used. More recently Mr. S. S. Buckman2 has shown that the smooth forms grouped by M'Coy and others in Martinia are the catagenetic members of several spiriferid stocks. Buckman considered that Martinia and Brachythyris were distinct from the other spirifers in their shape and in their lack of dental plates.

Type
Original Articles
Information
Geological Magazine , Volume 64 , Issue 3 , March 1927 , pp. 106 - 119
Copyright
Copyright © Cambridge University Press 1927

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References

page 106 note 1 M'Coy, F., Syn. of the Carb. Lst. Foss. of Ireland, 1844, p. 128.Google Scholar

page 106 note 2 Buckman, S. S., “Brachiopod Homoeomorphy”: Q.J.G.S., vol. lxiv, 1908, p. 27.CrossRefGoogle Scholar

page 106 note 3 For a description and a history of the nomenclature of these beds, see “The Geol. of the S. Wales Coalfield”, pt. viii, “The Country around Swansea”: Mem. Geol. Surv., 1907, p. 21.Google Scholar

page 106 note 4 Dixon, E. E. L. and Vaughan, A., “The Carboniferous Succession in Gower”: Q.J.G.S., vol. lxvii, 1911, pp. 491, 504, 549.Google Scholar

page 107 note 1 See, for example, Davidson, T., “Brit. Foss. Brach.,” vol. ii, Mon. Pal. Soc., 1859, p1. ix, fig. 20.Google Scholar

page 108 note 1 Phillips, J., Geol. of Yorks., pt. ii, 1836, p. 219, and p1. x, fig. 5.Google Scholar

page 108 note 2 Sowerby, J., Min. Conch., vol. iii, 1820, p. 125, and pl. cclxxi.Google Scholar

page 108 note 3 Op. cit., p. 219, and pl. x, fig. 4.

page 109 note 1 Op. cit., pl. xi, figs. 1 and 2.

page 110 note 1 Op. cit., p. 219.

page 110 note 2 Martin, W., Pet. Derb., 1809, tab. xlviii, figs. 11 and 12.Google Scholar

page 110 note 3 M'Coy, F., Brit. Pal. Foss., 1855, p. 420.Google Scholar

page 110 note 4 Op. cit., p. 30.

page 110 note 5 Op. cit., pl. xlviii, fig. 10.

page 110 note 6 Op. cit., p. 30.

page 110 note 7 Ibid., p. 31, quoting Davidson, op. cit., pl. xi, fig. 2.

page 111 note 1 Buckman, S. S., “Brachs. of the Namyau Beds”: Pal. Indica, 1917, p. 7.Google Scholar

page 113 note 1 Matley, C. A. and Vaughan, A., “The Carboniferous Rocks at Loughshinny”: Q.J.G.S., vol. lxiv, 1908, p. 468.Google Scholar

page 118 note 1 “The Geology of the Wales Coalfield, S.,” pt. ix, “West Gower and the Country around Pembrey”: Mem. Geol. Surv., 1907, p. 14.Google Scholar

page 118 note 2 Op. cit., p. 551.

page 118 note 3 Ibid., p. 550.

page 118 note 4 “West Gower”: op. cit., p. 35.