MAKE A MEME
View Large Image
| View Original: | The_Quarterly_journal_of_the_Geological_Society_of_London_(13936868982).jpg (1201x2100) | |||
| Download: | Original | Medium | Small | Thumb |
| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: The Quarterly journal of the Geological Society of London (13936868982).jpg OF FIVE GENERA OF MESOZOIC REPTILES 45 <br> dilian and Dinosaurian feature of carrying the upper costal articu- <br> lation on the arch and the lower on the centrum Its Dinosaurian <br> nature is proved by the opisthoccelous centrum ; and I shall show <br> below that there is a considerable probability that it belonged to the <br> Theropodous group of that order <br> The most peculiar feature of this specimen consists in the presence <br> of a distinct intercentrum hypapophysis on its anterior border <br> which I have not seen described in any member of the order The <br> flattened kidney-shaped surface marked d in the figure is evidently <br> for the articulation of the odontoid process or centrum of the atlas ; <br> while the marginal receding surfaces e are for the inferior ring of <br> the atlas which is now generally regarded as representing the first <br> intercentrum or that between the cranium and the atlas <br> Compared with the very small figure of the axis of Oeratosaurus <br> given by Prof Marsh in the ' Amer Journ ' ser 3 vol xxvii pi x <br> 1884 the general resemblance is so close as to indicate the strong <br> probability that the present specimen belongs to the same suborder ; <br> and it therefore seems highly likely that it may be referable to <br> the Wealden species of Megalosaurus or to a nearly allied form <br> In the American genus however the centrum of the atlas is anchy- <br> losed to that of the axis to form an odontoid process ˘ and from the <br> forward projection of the inferior border of the anterior part of the <br> centrum of the axis it would appear that the second intercentrum <br> or that between the atlas and axis is likewise anchylosed to the <br> centrum of the latter This appears to be the view adopted by <br> Dr Baur who on page 289 of the memoir cited observes that in <br> Crocodiles the hypapophysis intercentrum between the axis and <br> atlas is probably coossified with the anterior and lower part of the <br> axis-centrum as in Birds and some Dinosaurs <br> The present instance of the persistence of this second inter- <br> centrum as a separate ossification in a Wealden Dinosaur is a <br> circumstance of considerable interest apparently pointing to the <br> derivation of the order from Reptiles in which this was always the <br> case Whether any of the earlier Crocodiles exhibit a similar <br> feature will be a matter for future investigation <br> III Femur of an Iguanodont Dinosaur from the Oxford <br> Clay near Peterborough <br> The only evidence hitherto recorded of the existence of Iguano- <br> dont Dinosaurs in England during the period of the Oxford Clay is <br> based upon a right femur described and figured by Prof Seeley in <br> vol xxxi p 149 pi vi of the Society's ' Journal ' for 1875 under <br> the name of Cryptosaurus eumerus That specimen of which the <br> precise locality seems to be unknown is preserved in the Woodwardian <br> Museum at Cambridge and indicates a comparatively small species <br> its total length being 12 25 inches The grounds on which that <br> specimen was made the type of a distinct genus are stated to be <br> See Baur Amer Nat vol xx pp 288-293 1886 36939786 113696 51125 Page 43 Text 45 http //www biodiversitylibrary org/page/36939786 1889 Geological Society of London NameFound Cryptosaurus eumerus NameConfirmed Cryptosaurus eumerus NameBankID 6561890 NameFound Megalosaurus NameConfirmed Megalosaurus EOLID 13154127 NameBankID 4234935 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36939786 dc identifier http //biodiversitylibrary org/page/36939786 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13936868982 2015-08-26 06 56 03 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
.jpg){kind=link}
