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II.—On some Jurassic Species of Cheilostomata

Published online by Cambridge University Press:  01 May 2009

J. W. Gregory
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Extract

The extraordinary abundance of Bryozoa of the order Cheilostomata which occurs throughout the Cainozoic era,incomparison with their scarcity in earlier formations, has often been remarked. Interesting explanations of the suddenness of their appearance have, moreover, been offered by those who do not attach so much importance, as do some, to the imperfection of the geological record. Cheilostomata are not unknown from earlier deposits: the Cretaceous system has yielded a fair number, while even as early as the Silurian species have been found. Though doubts have been thrown on these early records, there seems no sufficient reason to discredit them. Even if Prof. Nicholson's Hippothoa inflata (Hall) should turn out to be a Stomntopora, which, if the figure be correct, is most unlikely, there remain many species in later Palæozoic deposits: such are those belonging to Prof. James Hall's genus Paleschara? which Mr. Ulrich accepts as Chilostomatons, though Prof, von Zittel includes it doubtfully with the Ptilodictyonidæ. Some of the specimens of Lichenalia, etc., figured by Hall, as well as the same author's Cystopora geniculata, may also belong to this order.

Type
Research Article
Information
Geological Magazine , Volume 1 , Issue 2 , February 1894 , pp. 61 - 64
Copyright
Copyright © Cambridge University Press 1894

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References

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page 61 note 6 Ibid. p. 103, pi. lxvi. figs. 7–9.

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page 62 note 2 So named as it is the first recorded Jurassic species of this genus and family.

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