102 



PROF. E. RAY LANKESTER ON THE 



Text-fig. 25. 



/>. OSS. 



[Feb. 5, 



Lateral view of tlie skull of a Giraffe, about two-thirds grown. 

 occ, occipital crest ; p.oss., parietal ossicone (epiphysis) overlj'ing the parietal conical 

 upgrowth and spreading on to the frontal hone ; sfp., fronto-parietal suture ; 

 o.t.l., position of the lateral frontal tumescence in the Okapi, absent here ; 

 g.t.m., the characteristic median tumescence of the Giraffe's frontal, devoid in 

 this specimen of anj' secondary cap or epiphysis, absent in the Okapi ; fLv., the 

 prselacrymal vacuity. 



(From Trans. Zool. Soc. vol. xvi. p. 284.) 



Text-fig-. 26. 



View from above of the fronto-parietal region of the skull of a verj' young Giraffe. 

 The parietal epiphyses were already ossified, but separable, and are here removed. 

 occ.li., exostosis of the occipital crest, which in some adult Giraffes forms a second 

 pair of " horns " (iive-horned Giraffe) ; c/tl., the Giraffine lateral tumescence, seen 

 here to originate in the parietal bone, which carries the conical ossicone aud forms 

 the Giraffe's paired " horns " ; ot.l., the position of the Okapi's lateral tumes- 

 cence of the frontal bone, absent in Giraffe ; zi/., z5'gomatic arch ; po., posterior 

 angle of the orbit ; ao., anterior angle of the orbit ; pl.v., prselacrymal vacuity 

 sof., supraorbital fossa ; sfp., fronto-parietal suture. 



(From Trans. Zool. Soc. vol. xvi. p. 291. ^ 



