File:The Quarterly journal of the Geological Society of London (13937000782).jpg
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[edit]DescriptionThe Quarterly journal of the Geological Society of London (13937000782).jpg |
PR. G. J. HINDE ON ARCHJEOCTATHUS AND OTHER GENERA. 125 8. On ARCHiEOCYATHtrs, Billing s, and on other Genera, allied to or associated ivith it, from the Cambrian Strata of North America, Spain, Sardinia, and Scotland. By George Jennings Hinde, Ph.D., F.G.S. (Read December 19, 1888.) .Plate V.. The real characters and the relations of the group of fossils known generally under the term Archmocyathus are at present subjects of discussion among palaeontologists ; they have been regarded as allied to Foraminifera, Sponges, and Corals. Many of the forms occur in the lowest fossiliferous zones of the Cambrian rocks, and are thus among the earliest known forms of life, a fact which gives addi- tional interest to their study. Since Mr. Billings first called attention to them in 1861, they have been investigated by several authors, more particularly by Sir J. W. Dawson, Prof. Ferd. Homer, Mr. C. D. Walcott, and, more recently, by Dr. Bornemann ; but it cannot be said that the obscurity attaching to them has been fully cleared up. I have been induced by Sir J. W. Dawson to under- take an independent investigation of their characters, based more particularly on their microscopic structure, and, thanks to the kind- ness of the above-named authors, I have been supplied with material which has enabled me to ascertain by direct comparison the nature of these fossils from widely separated localities. Thus Sir J. W. Dawson sent some specimens from Labrador belonging to McGill College Museum ; the Geological Survey of Canada, through Mr. J. F. Whiteaves, F.G S., supplied me with the type forms described by the late Mr. Billings ; Prof. Ferd. Eomer with the figured speci- mens of Archceocyathus marianus from Spain ; and to Dr. J. G. Bor- nemann I am indebted for fragments of rock filled with these fossils, which he collected in the Island of Sardinia *. The microscopic sections which I have prepared from these speci- mens show tha tthe organisms originally included in Archmocyathus vary considerably in structure, and cannot properly be included in a single genus, and it is owing to this fact that much of the uncer- tainty respecting the real nature of the genus has arisen. With the view of clearing up the subject, I have in this paper described, in con- siderable detail, the microscopic and other features of the different species originally referred to Archceocyathus, as well as of other forms which have been considered to be allied to it ; I have removed from the genus, and placed in other genera, the forms which do not generically correspond in structure with its type species, and I have discussed the relationship of these different fossils to Corals and Sponges respectively. Since this paper was read before the Society, Mr. C. D. Walcott has kindly sent me specimens of Ethnophyllum, Meek, from Nevada, and of Coscinocyathus Billingsi, Walcott, from Labrador. — (G-. J. H., Jan. 24,1889.) |
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Source | https://www.flickr.com/photos/biodivlibrary/13937000782 | ||
Author | Geological Society of London | ||
Full title InfoField | The Quarterly journal of the Geological Society of London. | ||
Page ID InfoField | 36939908 | ||
Item ID InfoField | 113696 (Find related Wikimedia Commons images) | ||
Title ID InfoField | 51125 | ||
Page numbers InfoField | Page 123 | ||
Names InfoField | NameFound:Coscinocyathus NameConfirmed:Coscinocyathus NameBankID:4126595 NameFound:Foraminifera NameConfirmed:Foraminifera EOLID:2869058 NameBankID:5953016 | ||
BHL Page URL InfoField | https://www.biodiversitylibrary.org/page/36939908 | ||
Page type InfoField | Text | ||
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Flickr posted date InfoField | 21 April 2014 | ||
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current | 05:54, 26 August 2015 | 1,186 × 2,104 (453 KB) | Fæ (talk | contribs) | == {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13937000782 | description = PR. G. J. HINDE ON ARCHJEOCTATHUS AND OTHER GENE... |
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