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V.—Note on the Spicules described by Billings in Connection with the Structure of Archæocyathus Minganensis

Published online by Cambridge University Press:  01 May 2009

George Jennings Hinde
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Extract

In “The Palæozoic Fossils of Canada,” vol. i. p. 3, the late Mr. Billings stated that by treating a silicified specimen of Archæocyathus Minganensis with acid, he ascertained that it contained numerous siliceous spicula—slender, fusiform, slightly curved, acute at both extremities—and that these fossils must therefore be classified among the extinct tribes of sponges. Referring again to this species in the latter part of the same volume (pp. 354–357), this author states that he had found the same spicula present in great numbers in another large species, Trichospongia sericea, and that it therefore remained an open question whether they actually form part of the structure of Archæocyathus, or belonged to Trichospongia.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 5 , May 1888 , pp. 226 - 228
Copyright
Copyright © Cambridge University Press 1888

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References

page 227 note 1 American Journ. of Science, n.s. vol. 45 (1868), p. 62Google Scholar; vol. 46, p. 144.

page 227 note 2 Life's Dawn on Earth, p. 154.Google Scholar

page 227 note 3 Lethæa Palsæozoica, p. 301.Google Scholar

page 227 note 4 Versteinerungen der Insel Sardinien (1886), p. 28.Google Scholar

page 227 note 5 Cambrian Faunas of North America, Bull. No. 30, U. S. Geol. Surv. (1886), p. 72.Google Scholar

page 227 note 6 Zeitsch. d. deutsch. Geol. Gesellsch. 1886, p. 899.Google Scholar

page 227 note 7 Thus we find one of the latest writers on it, MrWalcott, C.D., stating that the presence of spiculæ; in this species associates it with the Spongiæ, close to the family Euretidse of Zittel, and he considers that the spicula; “ in several of the species have been lost in the crystallization of the calcite now forming the skeleton,” I.e. p. 80.Google Scholar

page 228 note 1 American Journ. Sci. vol. xlv. p. 62.Google Scholar