90 Dr. T. Wright on the Palceontology of the Isle of Wight, 



fers so much from our specimen, that we cannot suppose .(i^jv 

 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 |^f ths ; 

 behind % inches and g^Qth ; the antero-posterior diameter at its 

 widest part exceeds 1 inch, and its transverse diameter is -jj^ht/ 



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The crown [d, h, c) is unequally convex in front and concave (a) 

 behind. The general form of the crown is shown in a,b,c; 

 the anterior side thereof {a, h) is convex and sabre-shaped, 

 and the posterior border (a, h) is slightly concave ; the external 



