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| Keywords: The Quarterly journal of the Geological Society of London (12960307883).jpg was based were <br> crushed and flattened forms in which the skeleton appears as raised <br> lines or narrow thread-like ridges arranged in a lattice- like reticula- <br> tion on the bedding-planes of the slate which serves as a matrix <br> Dr Hicks's specimen fig 1 on the other hand presents us with the <br> Fig 1 ” Part of tlie specimen 0/ Protospongia feuestrata in the <br> IVoodwardian Mtrscmii S'atural size <br> spicules of the sponge in their original form unaltered or but slightly <br> altered by pressure and standing out in free relief from the weathered <br> matrix which has in several places been artistically cleared away <br> from beneath them <br> In this state of perfect preservation the spicules are clearly not <br> fused together into a continuous network ; they are separated and <br> free and only form a network by the interlacing of their extremities <br> Their form also is somewhat different from that of the s ncules of <br> crushed specimens <br> Form of tJie Sjncules ” Each sj icule is quadriradiate with its <br> centre raised some slight but variable distance above the plane in <br> which its rays terminate Its general form may be most easily <br> described by imagining it as modelled upon a low four- sided pyra- <br> mid the centre of the spicule lying upon the apex and its four rays 36090726 111264 51125 Page 363 Text 36 http //www biodiversitylibrary org/page/36090726 1880 Geological Society of London NameFound Protospongia NameConfirmed Protospongia NameBankID 1883070 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 36 1880 Geology Periodicals Smithsonian Libraries bhl page 36090726 dc identifier http //biodiversitylibrary org/page/36090726 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-06 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12960307883 2015-08-26 15 51 18 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1880 Photos uploaded from Flickr by Fæ using a script | ||||
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