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| Keywords: The Quarterly journal of the Geological Society of London (13937061631).jpg 234 <br> ItlR E LYDEKKER ON REMAINS OF EOCENE AND MESOZOIC <br> that the shell alone is insufficient to afford certain generic characters <br> For the same reason the term Propleura of Cope 1870 must be re- <br> jected We have however the name Lytoloma Cope based on the <br> evidence of the mandible and which is earlier than Glossoohdys <br> Seeley 1871 which was based on the skull There is indeed the <br> name Puppigerus Cope 1870 The type of that genus must be <br> taken to be Chelone longiceps Owen as being the first-mentioned of <br> Fig 2 ” Ventral and Lateral Aspects of the Imperfect Mandible of <br> Lytoloma cantabrigiense ; from the Cambridge Greensand <br> Nat size <br> the English Eocene forms on which that genus is based Now the <br> skull of that form as I have recently found is similar to that of the <br> young of the so-called Chelone crassicostata one of the typical forms <br> of Euclastes ; and Puppigerus is therefore a synonym of the latter <br> The names Lytoloma and Puppigerus occur in the same volume ; but <br> since the former comes first and the latter includes forms which <br> are distinct I propose to adopt Lytoloma in the place of Euclastes <br> I may also mention that in young individuals and perhaps in the <br> adult of some of the apparently smaller forms like L trigoniceps of <br> the Bracklesham beds the mandibular symphysis as shown by a <br> specimen in the Museum of Practical Geology is shorter and more <br> convex than in the adult of L crassicostatum and L planimentum and <br> is thus almost similar to the mandible of Thalassochelys <br> In these respects the present mandible agrees very closely with 36940025 113696 51125 Page 232 Text 45 http //www biodiversitylibrary org/page/36940025 1889 Geological Society of London NameFound Chelone crassicostata NameFound Chelone longiceps NameConfirmed Chelone longireps Ow NameFound Euclastes NameConfirmed Euclastes NameBankID 4163308 NameFound Lytoloma NameConfirmed Lytoloma NameBankID 4228241 NameFound Lytoloma crassicostatum NameConfirmed Lytoloma crassicostatum Owen NameFound Lytoloma planimentum NameFound Lytoloma trigoniceps NameConfirmed Lytoloma trigoniceps Owen 1849 NameFound Propleura NameConfirmed Propleura NameBankID 4311972 NameFound Puppigerus NameConfirmed Puppigerus NameBankID 4324015 NameFound Thalassochelys NameConfirmed Thalassochelys NameBankID 212696 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36940025 dc identifier http //biodiversitylibrary org/page/36940025 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 N02/13937061631 2015-08-26 06 53 09 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 | ||||
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