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III.—The genus Bouchardia (Brachiopoda) and the Age of the Younger Beds of Seymour Island, West Antarctic

Published online by Cambridge University Press:  01 May 2009

J. Allan Thomson
J. Allan Thomson
Affiliation:
Director of the Dominion Museum, Wellington, N.Z.
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Extract

Shells with the external aspect of Bouchardia have been known for some time from the New Zealand Tertiary (Oamaruian), and were first described by Hutton in 1905 under the names of Bouchardia rhizoida and B. tapirina. The correctness of this generic ascription was doubted by von Ihering, who stated that the shells lacked the characteristic external form of Bouchardia. In this, however, von Ihering was mistaken, probably owing to the unsatisfactory nature of Hutton's figures, for these species agree externally with Bouchardia in the very characters which he supposes they lack, viz., the very sharp beak ridges, the more or less straight sides, and the presence of a longitudinal cord over the suture of the deltidial plates. The most characteristic external feature of the shell of Bouchardia is that the sharp beak ridges unite in an apex dorsally of the foramen, i.e. the foramen is epithyrid. In Hutton's supposed Bouchardiæ the foramen is permesothyrid, but almost epithyrid.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 6 , June 1918 , pp. 258 - 263
Copyright
Copyright © Cambridge University Press 1918

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References

page 258 note 1 Trans. N.Z. Inst., vol. xxxvii, p. 480Google Scholar.

page 258 note 2 Not Waldheimia tapirina, Hutton, 1873Google Scholar.

page 258 note 3 Ann. Mus. Nac. Buenos Aires, t. xiv, p. 473, 1907.

page 258 note 4 Wissensch. Ergebn. Schwed. Südpolar-Exped., Bd. iii, Lief. vii, pp. 14–17, 32, 1910.

page 259 note 1 “Brachiopod Genera: The Position of Shells with Magaselliform Loops and of Shells with Bouchardiform Shape”: Trans. N.Z. Inst., vol. xlvii, pp. 392–403, 1915Google Scholar.

page 259 note 2 Buckman, S. S., “Terminology for Foraminal Development in Terbratuloids (Brachiopoda)”: Trans. N.Z. Inst., vol. xlviii, pp. 130–2, 1916Google Scholar.

page 260 note 1 Ihering, H. von, “Les mollusques fossiles du Tertiaire et du Crétacé supérieure de l'Argentine”: Ann. Mus. Nac. Buenos Aires, t. xiv, pp. 480–1, 1907Google Scholar. Buckman unfortunately overlooked this reference in drawing up his bibliography.

page 262 note 1 Cf. Fischer, P. & Oehlert, D. P., “Mission scientifique du Cap Horn (1882–3): Brachiopodes”: Bull. Soc. Hist. Nat. d'Autun, t. v, pp. 254–334, 1892Google Scholar. Thomson, J. A., “Additions to the knowledge of the Recent Brachiopoda of New Zealand”: Trans. N.Z. Inst., vol. xlvii, pp. 404–9, 1915Google Scholar.