MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(12711499553).jpg (1828x3200) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (12711499553).jpg WOODWARD HIPPURITID 47 <br> ligamental inflection is seldom indicated externally ; but in those species <br> which M D'Orbigny has distinguished as Bi-radiolites fig 19 <br> there is a peculiarly sculptured tract or cardinal area on each <br> side the ligamental line ; and in R Fleuriaui the upper valve is <br> rendered subspiral by a ligamental groove <br> The interior of each valve is nearly symmetrical but we may infer <br> from the structure of R Fleuriaui that the Radiolite like the <br> Hippurite was attached by the dextral valve ; an inference which <br> is confirmed by comparing R polyconilites with Caprotina The <br> outer wall or shell-layer of the Radiolite is unlike that of the Hip- <br> purite It consists of prismatic-cellular structure like the shell of <br> the recent Pinna f ; and in all specimens from chalk strata the cells <br> are empty As the shells of Pinna Inoceramus and Beletnnites in <br> the same formations are solid we may conclude that this difference <br> was original and essential <br> Fig 12 ” Part of the rim of Radiolites Mortoni Mantell from the <br> Lower Chalk of Sussex Traced from the original specimen in <br> the Museum of the School of Mines <br> I the outer edge ; b the inner edge ; v v the dichotomous impressions <br> fig 1 it forms nearly all that usually remains of the upper valve and all the <br> squamose ornaments of the lower valve In the Hippurite it is seldom distin- <br> guishable ; but is quite distinct in Caprina and Caprinella No such layer exists <br> in any of the Palliobranchiata Mr Sharpe has also pointed out that the long <br> prisms of the middle shell-layer are always parallel with the surface and not <br> always perpendicular to the laminae of growth like the tubes of Caprina and <br> Caprinella In the Palliobranchiata the slender shell-prisms cross obliquely from <br> the inner to the outer surface as shown by Dr Carpenter See Davidson's Mo- <br> nograph of the Brachiopoda; Pal Soc ” Dec 30 1854 S P W <br> Specimens of Radiolites Hceninghausii which have lost their inner shell-layer <br> present internally strong transverse furrows or lines of growth and a prominent <br> ligamental ridge The interior of the upper valve when in this condition shows <br> that the umbo of the young shell was marginal as represented in PI V fig 3 I <br> cannot distinguish R acutus D'Orb from the young of R Hceninghausii ” <br> Dec 30 1854 S P W <br> t The cells of Radiolites from the English Chalk are twenty-five times as large <br> as those of the recent Pinna ; and those of Pinna are 250 times as large as the <br> cells of Pandora Carpenter 35614607 110213 51125 Page 47 Text v 11 http //www biodiversitylibrary org/page/35614607 1855 Geological Society of London NameFound Brachiopoda NameConfirmed Brachiopoda EOLID 1498 NameBankID 230460 NameFound Caprina NameConfirmed Caprina NameBankID 112500 NameFound Caprinella NameConfirmed Caprinella NameBankID 4103206 NameFound Caprotina NameConfirmed Caprotina NameBankID 4103255 NameFound Inoceramus NameConfirmed Inoceramus EOLID 4747366 NameBankID 4205663 NameFound Pandora NameConfirmed Pandora EOLID 18356 NameBankID 240700 NameFound Pinna NameConfirmed Pinna EOLID 57673 NameBankID 2692221 NameFound R polyconilites NameFound Radiolites NameConfirmed Radiolites EOLID 4773465 NameBankID 4326522 NameFound Radiolites acutus NameConfirmed Radiolites EOLID 4773465 NameBankID 4326522 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 11 1855 Geology Periodicals Smithsonian Libraries bhl page 35614607 dc identifier http //biodiversitylibrary org/page/35614607 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12711499553 2015-08-26 20 52 16 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1855 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
