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The Structure and Development of Sphenotrochus crispus, and Notes on Aporose Morphology

Published online by Cambridge University Press:  01 May 2009

T. A. Ryder
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Extract

A Porose corals have, with few exceptions, received little attention in Britain since the publication of works by P. M. Duncan and R. F. Tomes, during the latter half of last centary. The newer methods of investigation by means of thin slices and serial sectioning, so successfully employed by Drs. Stanley Smith and W. D. Lang, and others, in the Rugosa, were not then in use, and so very little is known of the internal structures–the only basis for classification and comparison–or of the developmental stages of the Aporosa.

Type
Original Articles
Information
Geological Magazine , Volume 64 , Issue 8 , August 1927 , pp. 376 - 381
Copyright
Copyright © Cambridge University Press 1927

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References

page 376 note 2 Martin, P. Duncan, Supplement to Monograph of the British Fossil Corals, 1866–1872, and various papers in the Geol. Mag.Google Scholar and Quart. Journ. Geol. Soc., 1863–1890, and R. F. Tomes, papers in the same, 1884–99.Google Scholar

page 376 note 3 The first, “The Structure and Development of Holocystis Ed. and Haime,” was puhhshed in the Geol. Mag., Vol. LXIV, 1927, pp. 119–22.Google Scholar

page 377 note 1 It sometimes happens that owing to irregularity of growth or other causes the later cycles of septa are incomplete, e.g. in Holocystis elegans (Fitton) the tertiary cycle is not complete, ooly four or five being developed.

page 377 note 2 See Duncan, P. M., “Supplement to British Fossil Corals,” Pal. Soc. Mono., pp. 8–9.Google Scholar

page 377 note 3 These ridges should not he confused with those found on Rugose corals, which have a different origin, being inter-septal, i.e. they correspond to the gaps between the septa and not to the edges of the septa themselves, as above.

page 379 note 1 These must not be confused with the true carinae, that is arched ascendant ridges developed on the sides of the septa in certain Rugose genera, e.g. Heliophyllum Hall.

page 380 note 1 A somewhat similar type of costal ornamentation has been described in Levipalifer orienialis by Vaughan, T. Wayland, Proc. United States Museum, vol. xxii, 1900, p. 201.Google Scholar