Dr. T. Wright on th,< l*alaontology of the hie of Wight. 231 



Hordwell, Beacon, and Barton Cliffs*, from whence Mr. Falconer 

 obtained the specimen which formed the subject of Professor 

 Owen's paper. It is important, therefore, to note that these 

 mammalian remains have been found in precisely the same geo- 

 logical horizon on both shores of the Solent sea ; thus affording 

 another link in the chain of evidence which proves the former 

 union of these tertiary beds. I have promised the loan of this 

 specimen to Professor Owen, who will figure it in the forthcoming 

 new edition of his ' British Fossil Mammalia f for this reason I 

 have not figured it here. 



Tooth of an unknown Saurian. 



I had the good fortune to meet with a very perfect reptilian 

 tooth in the Wealden clay of Brixton Bay; the accompany- 

 ing figure, of the natural size, was drawn on wood by Mr. W. 

 H. Baily, as it is important that palaeontologists should possess 

 a faithful drawing of its singular form, to enable them to com- 

 pare future discoveries with the subject of this note, and even- 

 tually to determine the genus of Saurians to which it belonged. I 

 had the pleasure of showing this tooth to Professors Forbes, Ger- 

 vais and Owen, Dr. Mantell, and Messrs. Waterhouse and Wood- 

 ward, who were all unacquainted with the form. Dr. Mantell 

 thought it had some resemblance to a tooth found in the Wealden 

 of Tilgate Forest, and which he imagined belonged to the Hy- 

 Ueosaurus. " These teeth," he observes, " are about \\ inch in 

 height, and commence at the base with a cylindrical shank, 

 which gradually enlarges into a crown of an obtusely lanceolate 

 form, convex in front, slightly depressed, and terminating in an 

 angular rounded apex, the margins of which are generally more 

 or less worn, as if from dentrition. The crown is solid, but the 

 fang encloses a small pulp-cavity ; the surface is enamelled, and 

 covered with very fine longitudinal striae ; the base in every spe- 

 cimen appears broken transversely, and has not a smooth sur- 

 face, as if it had been loosened by absorption and shed natu- 

 rally -j\" The Doctor has given a figure of this tooth which dif- 

 fers so much from our specimen, that we cannot suppose it 

 belonged to a reptile of the same genus. 



Description. — Our new tooth is divisible into the crown and 

 the root : the line of demarcation between these parts is clearly 

 defined by the terminal undulation of the enamel. The crown 

 is somewhat of a bayonet-shape ; from the frontier line of the 

 enamel to the apex, it measures in front 1 inch and j^ths; 

 behind 2 inches and ^th ; the antero-posterior diameter at its 



* See p. 120 of these Proceedings. 



t Hand-Book of the Fossils of the British Museum, p. 326. 



t2 



