DE. E. EAT LANKESTEE ON OKAPIA. 



287 



Giraffe skulls, except those of old individuals. The preelacrymal vacuity occurs in other 

 Pecora besides the Giraffe, being well developed both in Alces and in Antilocapra and 

 other CervidfE and Bovidse. 



We have not so far found any character, beyond the general shape of the skull, 

 which tends to associate the Okapi with GirafRdee rather than with Bovidse or Cervidee. 

 And, as a matter of fact, though an enumeration of details, such as shape of the nasals 

 and each of the cranial bones, the absence of lacrymal fossa, and presence of prselacrymal 



Text-fig. 7. 



/ Co, 



Vertical longitudinal section of the skull of a female Water-buck {Kohvs ellipsiprymnus), to show the high 



cranio-palatine angle in a hornless Bovid. 



c.a., basicranial axis ; pji., palatine horizontal. 

 Text-fia;. 8. 



Vertical longitudinal section of the skull of the Domestic Goat {Capra), to show the high angle formed 



by the cranial axis (c.a.) and the palatine horizontal (p.Ji.). 



occ, occipital crest. 



vacuity, would result in a totality of agreements with Giraffa greater than with any 

 other form, still we have not yet mentioned any one character peculiar to Giraffa 

 which also is found in Okapia. There is, however, such a character, and this is found 

 in the peculiar bifoliate form of the crown of the lower incisor on each side. If we 

 compare the group of eight teeth forming the biting-apparatus of the lower jaw in 

 Giraffa and Okapia, we observe that the group of teeth is relatively larger and more 

 widely spread (in proportion to size) in the former than in the latter. The group of 

 VOL. XVI. — PART VI. No. 2. — August, 1902. 2 t 



