ANOPLOTHERIUM AND GIRAFFE. 203' 



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 1-0 inch. 0-95 inch. 



Breadth 1-12 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 is not 

 observed in the camel, the moose deer, or the larger bovine 

 ruminants ; or if ever present, it is but faintly developed. 

 This texture is well marked on the enamel of the teeth of 

 this second species of giraffe. A magnified representation of 

 it is given in PI. XVI. fig. 1 0. 



The series of teeth last described, excepting the fifth and 

 sixth specimens, are all but undistinguishable from, those of 

 the Nubian giraffe ; and the authors have sought in vain for 

 any distinctive character by which to discriminate them. 

 There is no good evidence to show that this fossil species 

 and the living are even different ; but in putting the case 

 thus, the authors are far from advancing that the species are 

 identical. The materials are far too scanty to warrant a 

 conjecture to that extent. 



Since the neck of the G. Sivalensis was one-third too short 

 and slender to sustain the head that would have suited the 

 teeth last described, the authors consider it a necessary con- 

 sequence that these teeth belonged to a distinct species. 

 Had the difference been less considerable, they might have 

 hesitated regarding this conclusion ; but the difference 

 between 8 inches and 12 inches in the length of the same 

 cervical vertebra of two adult animals of the same genus 

 admits, in their opinion, of no other construction than distinct- 

 ness of species. For the present, until sufficient materials 

 shall be obtained to determine the relationship between the 

 African giraffe and the second Sewalik species, in refe- 

 rence to their supposed resemblance, the authors propose to 

 mark the latter by the provisional name of Camelopardalis 

 affinis. 



