28 FOSSIL REPTILIA OF THE KIMMERIDGE CLAY. 



the thin borders of the base of the pulp-cavity, where probably an additional 

 inch of the length of the tooth has been broken away. The characteristic 

 Pliosaurian modifications of the coronal enamel — smooth on the outer or longi- 

 tudinally convex side (fig. 2), and boldly ridged on the front (fig. 1) and back 

 (fig. 3) sides — are so truly and sharply delineated by Mr. Dinkel's skill as to 

 dispense with verbal illustration. 



In comparison with the tooth from the Kimmeridge Clay near Oxford (p. 15, 

 Tab. VII, of a former Monograph), 1 the crown in the present specimen, from the 

 same formation at Kimmeridge, Dorsetshire, is shorter in proportion to its 

 breadth, especially taken from the outer to the inner side of the base of the crown, 

 and there is a difference in the number and disposition of the ridges, but neither 

 of these amount to a distinction of specific value. 



1 Tom. cit., Tab. VII. 



