and Giraffe from North oj India. 585 



The fourth specimen is the last false molar of the left lower jaw, 

 detached. It agrees closely with the corresponding tooth in the 

 recent female head above referred to. This tooth is thicker in pro- 

 portion to its length in the giraffe than in other ruminants, and this 

 constitutes one of the most distinctive characters of the giraffe's 

 premolars. The anterior semi-barrel appears a trifle longer than the 

 corresponding tooth of the recent animal ; but this is owing to a 

 difference of wear, and is not borne out by measurement. The 

 dimensions are : — 



Fossil. Recent. 



Length 10 inch. 10 inch. 



Breadth 0'9 0'86 



The authors are possessed of the same tooth of the right lower 

 jaw, detached ; but have not thought it necessary to figure it. 



The fifth specimen is the penultimate false molar of the right 

 upper jaw. It is of the same size and form with the corres- 

 ponding tooth in the recent female head, with this difference, that 

 it has three tubercles at the inside of the base. On a sixth specimen 

 of the first false molar of the right upper jaw, which is not repre- 

 sented among the figures, there are three similar tubercles similarly 

 placed. It would require an extensive comparison of recent heads 

 to determine what value attaches to this peculiarity ; whether the 

 tubercles are constantly absent from the teeth of the recent species, 

 or appear occasionally as a variation on those of individuals. The 

 dimensions of the penultimate false molar of the upper jaw are : — 



Fossil. Recent. 



Length l'O inch. 0*95 inch. 



Breadth 112 1-12 



There is a peculiar, finely reticular, striated and rugose surface to 

 the enamel of the teeth of certain quadrupeds, the appearance of 

 which the authors compare to that of a fine net, forcibly extended, 

 so as to bring the sides of the meshes together. This texture they 

 formerly described as existing on the surface of the molars of the 

 Sivatherium. It is found also on the teeth of the recent giraffe, 

 and is more or less conspicuous on those of the hippopotamus. It 



