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| Keywords: The Quarterly journal of the Geological Society of London (12961575604).jpg MASON DAKOSAURUS <br> 219 <br> It is noticed by Prof Owen who rightly includes it among his <br> ' amphica3lian Crocodilia <br> Teeth of Bakosaurus are said to occur associated with remains of <br> PUosaurus Gyrodus Sjyhcerodus gig as c in the Potton Sands de- <br> scribed by Mr Seeley ; these are its companions both in the Upper <br> AATiite Jura of Schnaitheim and in the Kimmeridge Clay of England <br> Mr alkert also mentions it as occurring in beds probably of the same <br> age at Upware in the Pens of Cambridge and in similar company <br> I have examined through the kindness of Mr W Davies a suite <br> of the Potton fossils at the British Museum ; but it would be almost <br> impossible owing to the worn condition of these fossils which have <br> evidently been derived from older rocks to determine with any de- <br> gree of certainty its presence among them <br> The British Museum contains numerous specimens of Dakosaurus <br> from the German locality as well as a single tooth from the Kim- <br> meridge Clay of Boulogne and one from that of Ely near Cambridge <br> A comparison of these with the teeth from Oxford fails to discover <br> differences of specific value ; I therefore propose to retain M Quen- <br> stedt's name of maximus for the latter <br> Fig 3 <br> Fig 4 <br> a External view of tooth of Dakosaurus the <br> ridges forming the contour lines Side view of an anterior <br> b The same tooth showing the pulp-cavity tooth of Dakosaurus <br> This genus is characterized by large conical incurved and slightly <br> recurved teeth the smooth and polished enamelled crowns of which <br> are traversed by two sharp prominent minutely crenulated longi- <br> tudinal ridges one forming the posterior the other the anterior <br> margin of the tooth ; these ridges are situated midway between <br> the convex and concave curvatures of the tooth which is compressed <br> at the apex so as to give in transverse section a slightly oval figure <br> pointed before and behind ; but this character dies away towards the <br> base where the crown becomes cylindrical and ceases to be inter- <br> rupted by the ridges ; one of these the anterior is lost sooner than <br> the other which is continued a short distance into the cement- <br> Palgeontology 2nd edit p 300 t Geol Mag vol iv p 309 36103064 111288 51125 Page 219 Text v 25 http //www biodiversitylibrary org/page/36103064 1869 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36103064 dc identifier http //biodiversitylibrary org/page/36103064 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 N02/12961575604 2015-08-26 15 53 55 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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