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| Keywords: The Quarterly journal of the Geological Society of London (12961662964).jpg 1869 <br> EGEKTON GTRODTJS <br> 385 <br> but from this it differs in having the median teeth circular instead <br> of transversely oval <br> Another specimen belonging to Mr Mansel is one of great in- <br> terest There has long been a controversy touching the validity of <br> the genus Sphoerodus The similarity of the teeth to those of some <br> of the larger species of Lepidotiis induced Agassiz to establish the <br> genus Tvith some hesitation Owen however detected some dif- <br> ferences in the microscopic structure of the tooth which led him <br> to consider the two genera distinct Many continental palaeonto- <br> logists on the other hand repudiated the genus Sphcerodus as <br> founded in error The main obstacle to a satisfactory solution of <br> the difficulty arose from the circumstance that the Bufonites were <br> generally found detached from the dentary bones In Mr Mansel's <br> specimen fig 5 however we have true SpJicBrodus teeth arranged <br> Fig 4 ” Vomer of Gyrodus cocco- <br> derma <br> Fig 5 ” Vomer of Sphse- <br> rodus gigas <br> in natural order ; and not only so but the specimen is fortunately <br> a vomerine bone the form of which is entirely different from the <br> palatal organization of Lepidotus and essentially characteristic of <br> the Pycnodonti The specimen is 2 inches in length and contains <br> the median series of teeth the two intermediate rows and two <br> teeth of the marginal row of the left side The median row is <br> composed of six teeth of circular form ; the intermediate rows con- 36103250 111288 51125 Page 385 Text v 25 http //www biodiversitylibrary org/page/36103250 1869 Geological Society of London NameFound Bufonites NameConfirmed Bufonites Deluc 1800 NameFound Gyrodus cocco derma NameFound Lepidotus NameConfirmed Lepidotus EOLID 4604326 NameBankID 177405 NameFound Sphcerodus Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36103250 dc identifier http //biodiversitylibrary org/page/36103250 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 N02/12961662964 2015-08-26 14 50 53 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1869 Photos uploaded from Flickr by Fæ using a script | ||||
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