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IV.—A Revision of some Carboniferous Corals1

Published online by Cambridge University Press:  01 May 2009

R. G. Carruthers
R. G. Carruthers
Affiliation:
the Geological Survey.
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Extract

There are several constants of value in the determination of this species. They are:—(1) The epithecal characters; (2) the spacing of the major septa (i.e. their number in a given diameter); (3) the thickening of stereoplasma in the lower and conical part; (4) the characters of the dumonti phase (PI. VI, Figs, 1b–1d and 2a–2d); (5) the nature of the dissepiments, and their restriction to the mature growth stages; (6) the nature of the tabulæ. Of these, (2), (4), and (6) are of particular importance.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 4 , April 1908 , pp. 158 - 171
Copyright
Copyright © Cambridge University Press 1908

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Footnotes

1

Communicated by permission of the Director of the Geological Survey of Great Britain.

References

page 159 note 1 In Murch, ., de Vern, ., & Keyserl, .: “Russia and the Ural Mountains,” vol. i, p. 615 (1845).Google Scholar

page 159 note 2 Stuckenberg, A.: (1) Korallen u. Bryoz. d. Steinkohlen. d. Ural. u. Timan.: Mem. Com. Geol., vol. x, liv. 3, St. Petersburg, 1895Google Scholar. (2) Anthoz. u. Bryoz. d. Unter Kohlenkalk v. Central Eusslands: ibid., x.s., liv. 14, 1904.

page 159 note 3 Angelis d'Ossat, Corall. e. Brioz. d. Carbonifero [Carnian Alps]: Atti d. R. Acc. d. Lincei, ser. v, mem. ii, p. 256 (1897).

page 161 note 1 This feature, though not directly referred to by de Koninck, is seen in the typespecimen of his Zaphrentis edwardsiana. As the epitheca of that species is of medium thickness, the recognition of the dissepimental margin may be included in the words “èpithéque très épaisse,” given in his diagnosis.

page 164 note 1 In many vertical sections cut down the cardinal fossula, some of the tabulæ, while strongly depressed, are seen to bend upwards before reaching the wall. This is due to the fact that the fossular depression, instead of lying wholly in the plane of section, enters it obliquely at those points, and at some distance from the wall. Such an appearance will always be noticed if the coral be twisted so that a straight plane of section cannot always pass down the centre of the fossula.

page 166 note 1 Michelin, in Gervais, P.: article on Astraa, Dict. Sci. Nat., Suppl., I, p. 485 (1840).Google Scholar

page 166 note 2 No figure is given in the Atlas, however; this point will be referred to immediately when discussing Michelin's diagnosis of C. cornu-bovis.

page 167 note 1 Descr. Anim. Foss., pi. C, figs. 5a and 5e.

page 168 note 1 McCoy noted in his description of Cyathopsis cornucopia that “the absence of the vesicular zone of the true Caninia is not a little remarkable.“ This, of course, was because he erroneously took the true Caninia to be C. gigantea, and was unaware that Caninia cornucopia developed dissepimental margin in its final growth stages.