324 DR. C. J. FORSYTH MAJOR ON FOSSIL GIRAFFID^, [May 5, 



cavities filled with matrix exactly the same as those beneath the so- 

 called impaired horn of the Giraffe. So that what in the figure 

 appears as the posterior half of the nasals is in reality situated in the 

 frontal region behind the nasals. "We have thus here the homologue 

 of the median protuberance of the Giraffe. 



The postorbital portion in the Sivvalik hornless skull is a little more 

 elongated than in Sivatherium and Hydaspitherium, and would have 

 exactly the form of Hydaspitherium if the horns of this genus were 

 removed ; in the hornless skull the superior profile is nearly hori- 

 zontal. 



In the Helladotherium from Pikermi the parietal region is more 

 elongated still, as has been already stated. Gaudry describes on its 

 middle a feeble elevation of 2 cm. by 8 cm. in length, adding that 

 it corresponds perhaps to a sort of horn or central pyramid. The 

 examination of the original preserved in the Paris Museum showed 

 me that we have in reality two crests, as is visible too in the side 

 view, diverging a little forwards and circumscribing a sort of elevated 

 plateau, which in front is about 1 decim. broad, at the back 75 millim. 



Hellacl other ium duvernoyi. 

 Side view of skull, one-sixth nat. size (after Gaudry). Pikermi, Attica. 



In front of these the profile runs nearly horizontal as in Snmotherium, 

 and very different from the proclivous direction in the Siwalik skull, 

 which besides is much higher in this part. 



The orbits in both skulls are relatively small as in Sivatherium 

 and Hydaspitherium ; in the Helladotherium from Pikermi they 

 are situated farther back. 



There are several other differences between the two skulls which 

 for the present purpose may be omitted. On the whole my conclu- 

 sion is that, apart from a general likeness, they are so different from 

 each other, that far from belonging to the same species they must 

 even be ascribed to different genera. The Siwalik skull, except its 

 being hornless, approaches so near to the horned forms of the Siwaliks 

 just mentioned, but especially to Hydaspitherium, that I think the 

 original view of Falconer, which later on was shared by Murie, is not 

 so far from the truth as has been since supposed. Falconer con- 

 sidered it to be the female of Sivatherium, the only one of the three 



