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| Keywords: The Quarterly journal of the Geological Society of London (12733708853).jpg INTERMEDIATE BETWEEN BIRDS AND REPTILES 15 <br> affords we need no longer be doubtful as to the origin of the many <br> bipedal tracks which occur in the Trias and upwards <br> Some are very probably the spoor of Struthious birds which <br> may have existed fully as far back as the beginning of the Secondary <br> Period; but most are no doubt due to the bipedal habit of our <br> Secondary reptiles a peculiarity still maintained by the Australian <br> Chlamydosaurus <br> Discussion <br> Mr Seeley thought that the footprints on the slab cited in the <br> paper had been produced by some saurian such as a Pterodactyle <br> the fore limbs of which were wider apart than its hind limbs rather <br> than by Compsognathus If the foot-track had been due to a saurian <br> walking on its hind legs only he thought that the principal im- <br> pressions must of necessity have been nearer together He disputed <br> the correctness of the term adaptive modification as applied to <br> the air-cavities in bones He was inclined to regard the Pterodactyle <br> as more closely allied to birds than did the author of the paper <br> The condition of the carpus as well as the tarsus in these reptiles <br> showed their ornithic affinities He cited jerboas kangaroos and <br> other forms in which the hind legs were mainly used for pro- <br> gression but in which the sacrum and other bones were not modified <br> as instances calculated to inspire caution in connecting the mode of <br> progression with structure <br> Mr Hijlke could not regard the tracks as those of a Pterodactyle <br> as the inner marks were much less distinct than the outer and would <br> therefore hardly be due to the hinder limbs on which the weight <br> would mainly fall <br> Mr Blanford agreed with Mr Seeley that the mere fact of the <br> Chlamydosaurus walking on its hind legs did not suffice to prove any <br> affinity with Dinosaurians <br> Mr Woodward in reply stated that the two points on which <br> he had mainly founded the paper were ” 1st the occurrence of <br> footprints in the Solenhofen limestone characteristic of a bipedal <br> progression of some saurian which had moreover used its tail from <br> time to time to give it a forward impetus ; and 2ndly the method <br> of walking of Chlamydosaurus With regard to animals thus pro- <br> gressing he was not prepared to accept the view that there was no <br> corresponding modification in structure 35765862 110599 51125 Page 14 Text v 30 http //www biodiversitylibrary org/page/35765862 1874 Geological Society of London NameFound Chlamydosaurus NameConfirmed Chlamydosaurus EOLID 35715 NameBankID 2546853 NameFound Compsognathus NameConfirmed Compsognathus EOLID 4433879 NameBankID 4123015 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 30 1874 Geology Periodicals Smithsonian Libraries bhl page 35765862 dc identifier http //biodiversitylibrary org/page/35765862 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12733708853 2015-08-26 19 59 31 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1874 Photos uploaded from Flickr by Fæ using a script | ||||
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