202 FAUNA ANTIQUA SIVALENSIS. 



Fossil. Recent. 



Inches Inches 

 Joint length of the two back molars, upper jaw . . . .25 2-55 



Greatest width of last molar . . . . . . .14 1'3 



Ditto ditto of penultimate molar 1-45 1'35 



The second specimen (PI. XYI. fig. 6) is the rear molar of 

 the right upper jaw, corresponding exactly in size and form 

 with that of the left side, but if anything, rather more worn, 

 and belonging therefore probably to a different individual. 

 The agreement extends down to the small cone of enamel at 

 the base of the hollow between the barrels on the inside. 

 Its dimensions are : — 



Length 1-2 inch. 



Width 1-4 



The third specimen (PI. XVI. fig. 7) is a fragment of the 

 left lower jaw, containing the last molar. It has precisely 

 the form and proportions of the correspondmg tooth in 

 the left lower jaw of the female head referred to, and the 

 same development of its third barrel or heel, which is 

 always found in this tooth in ruminants. Its dimensions 

 are : — 



Length 1-7 inch. 



Greatest width . . . . . .1-0 



The fourth specimen (PL XYI. fig. 8) is the last false molar 

 of the left lower jaw, detached. It agrees closely with the 

 corresponding tooth ia the recent female head above re- 

 ferred to. This tooth is thicker in proportion to its length 

 in the giraffe than in other ruminants, and this constitutes 

 one of the most distinctive characters of the giraffe's pre- 

 molars. 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 1-0 inch. 1-0 inch. 



Breadth . . . .0-9 0-86 



The authors are possessed of the same tooth of the rio-ht 

 lower jaw, detached ; but have not thought it necessary to 

 figure it. 



The fifth specimen (PI. XVI. fig. 9) is the penultimate false 

 molar of the right upper jaw. It is of the same size and 

 form with the corresponding 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 represented among the 

 figures, there are three similar tubercles similarly placed. 



