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VI.—Brachiopod Morphology: Notes and Comments on Dr. J. Allan Thomson's Papers

Published online by Cambridge University Press:  01 May 2009

J. Wilfrid Jackson
J. Wilfrid Jackson
Affiliation:
Assistant Keeper, Manchester Museum.
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Extract

From a long and careful study of the Brachiopoda I am led to offer some observations upon the two recently published papers by Dr. J. Allan Thomson which have appeared in this Magazine. In the case of Dallina I cannot agree with Dr. Thomson regarding the type of folding. He considers D. septigera (the genotype) and D. raphaelis as dorsally biplicate, D. floridana as dorsally uniplicate. Now dorsal biplication is brought about by the dorsal sulcus being superimposed upon a single dorsal fold. In D. septigera, as well as in D. floridana, a broad ventral sulcus is superimposed upon a dominant ventral fold; these two species, therefore, are, in my opinion, ventrally biplicate (as in Magellania flavescens and some others).

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 1 , January 1916 , pp. 21 - 26
Copyright
Copyright © Cambridge University Press 1916

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References

page 21 note 1 “Brachiopod Morphology: Types of Folding in the Terebratulacea,” Geol. Mag., Dec. VI, Vol. II, 02, 1915, pp. 71–6;Google Scholar“The Genera of Recent and Tertiary Rhynchonellids,”Google Scholaribid., September, 1915, pp. 387–92.

page 21 note 2 “Revision of the Families of the Loop-bearing Brachiopoda” and “The Development of Terebratalia obsoleta, Dall”: Trans. Conn. Acad. Arts and Sci., ix, pp. 376–99, pls. i, ii, 1893.Google Scholar

page 21 note 3 “A Monograph of Recent Brachiopoda”: Trans. Linn. Soc. London; Zoology (2), iv, pl. x, fig. 3, 1886–1888.Google Scholar

page 22 note 1 Expéd. Scient. du “Travailleur” et du “Talisman”, 1880–1883, Brachopodes, Paris, 1891.Google Scholar

page 22 note 2 Op. cit., p. 382.

page 22 note 3 Op. cit., pl. ii, figs. 6–9.

page 22 note 4 Proc. U.S. Nat. Mus., xvii, pp. 726–7, pl. xxx, fig. 7, 1895.Google Scholar

page 22 note 5 See Davidson, op. cit., pl. vii, figs. 6b, 10.Google Scholar

page 22 note 6 The dental plates in both these are very similar, and appear to have been overlooked in descriptions of the species.

page 23 note 1 “Revision,” etc., pl. i, fig. g 1.

page 23 note 2 Op. cit., pl. xviii, fig. 6b.

page 24 note 1 “Revision,” etc., pp. 383–4.Google Scholar

page 24 note 2 Mon. Perm. Foss. England (Pal. Soc.).

page 24 note 3 Journ. de Conchyl., xxviii, p. 240, 1880.Google Scholar

page 24 note 4 Amer. Journ. Conch., vi, p. 129, 1870.Google Scholar

page 24 note 5 Not T. pectunculus, Schl.; see King, op. cit., p. 245.Google Scholar

page 24 note 6 Op. cit., p. 724.

page 24 note 7 Op. cit., pl. vii, fig. 11u.

page 24 note 8 Op. cit., pl. i, fig. da.

page 14 note 9 Copied by Davidson, op. cit., p. 106, fig. 9.

page 24 note 10 Op. cit., pl. i, fig. db.

page 24 note 11 See also Davidson, op. cit., pl. xxi, fig. 11.

page 24 note 12 Op. cit., p. 390.

page 25 note 1 Expéd. Scient., pp. 44, 103, etc.Google Scholar

page 25 note 2 In old adult shells of Hemithyris psittacea the pedicle collar sometimes becomes fused to the floor of the umbonal cavity of the ventral valve.

page 26 note 1 “Antarctic Fossil Brachiopoda, etc.”: Wiss. Ergebn. Schwed. S.P. Exped., 1901–1903, Bd. iii, No. 7, 1910.Google Scholar

page 26 note 2 Trans. Roy. Soc. S. Australia, xxiii, p. 257, 1899.Google Scholar