1907.] 



HORNS OF THE GIRAFFE. 



Ill 



Since it is clear then that the Giraffe's horns comprise two 

 bony factors, the question arises which of the two coiTesponds 

 with the horn-core of Bovidae, or whether either or neither had 

 such a correspondence. 



Text-fie-. 34. 



en h 

 plat*. 



hastsph. pi<^'f</- 



kull cut in the direct 

 d (linear) of the natui 



(Prom the Proc. Zool. Soc. London, 1904, vol. i. p. 154.) 



fnnt. 



'fit/ifit, 



p If/a I- 



View, looking forwards, of the skull cut in the direction of the line 4 in text-fig. 33. 

 One-third (linear) of the natural size. 



is more strongly marked in the horn-bearing skull of Okapi brought by Capt. Boyd 

 Alexander from the Welle River than in any other specimen seen bjMiie. No " ossi- 

 cone" or tegumentary cap has been observed in Okapi in connection with this 

 median tumescence. Has there been one present in the ancestors of Okapi ? Or 

 does the tumescence precede the formation of a tegumentary ossicone ? 



