90 Dr. T. Wright on the Paleontology of the Isle of Wight. 



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 ^^ths ; 

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

 widest part exceeds 1 inch, and its transverse diameter is y^oths 

 of an inch {d). 



The crown {d, b, 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, b) is convex and sabre-shaped, 

 and the posterior border {a, b) is slightly concave ; the external 



