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| Keywords: The Quarterly journal of the Geological Society of London (13889746329).jpg LOWER SILURIAN' ROCKS NEAR WELSHPOOL WALES <br> Fig 2 Tliainniscus antiquus Sj9 n <br> 111 <br> A The specimen enlarged 2 diameters <br> B C D Details more highly magnified <br> 2 Thamniscijs antiquus sp n Fig 2 <br> Zoarium apparently springing from a root-like base strong and <br> thick towards the bottom where several root-branches appear to be <br> united more delicate towards the younger or growing portion of <br> the zoarium Branches frequently dichotomising free Zocecia <br> tubular shown on one side only of the branch Tubular cells not <br> contiguous rather broad at the openings gradually thinning out <br> towards the axial region of the zoarium cell-mouths so far as I <br> can make out rather elongated peristomes not prominent reverse <br> striated <br> Formation Imbedded in volcanic ash probably of the age of <br> the Bala rocks <br> Locality Middleton Hill near Welshpool <br> Cahinet J B Morgan Esq Welshpool; one specimen <br> This beautiful specimen which I have drawn magnified about <br> four diameters is buried in volcanic ash which is so friable that it <br> breaks away with the least touch It is very certain that it is the <br> reverse surface that is exposed ; but towards the bottom the thick- <br> ened branch is broken away and the cells are exposed The <br> appearance of the branch at this part is shown in fig 2 b ; <br> but when more highly magnified the arrangement of the cells is <br> seen to be pretty regular and is shown in fig 2 c By extracting a <br> minute fragment of the specimen from the matrix I have been able <br> to expose the poriferous surface and this is shown in fig 2 d <br> So far as I am able to judge by carefully manipulating this delicate <br> fossil I can almost confidently assert that the species now described <br> dijffers considerably from the species previously described by myself <br> Quart Journ Greol Soc vol xxxviii p <br> k2 37046953 114009 51125 Page 111 Text 41 http //www biodiversitylibrary org/page/37046953 1885 Geological Society of London NameFound Thamniscijs antiquus sp NameConfirmed Thamniscus antiquus NameFound Tliainniscus antiquus NameFound Zoarium Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37046953 dc identifier http //biodiversitylibrary org/page/37046953 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889746329 2015-08-26 04 54 41 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by FĂŚ using a script | ||||
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