Ml . R. Lydelvkor on TIondeKs Okapies. I'liS 



wlilcli it a;;rcc.s with tlm typical .sj)3ciin mi prcsentel by Sir 

 Harry Johnston to the Briti.sh Museun, and desciibe'l by 

 Sir Ray Lankesfer in the ' Transactions of the Z')oIo;^ical 

 Seciety/ vol. xvi. pt. G (1902). In respect of their lar^'C 

 stature, both these specimens difEer from the two horned 

 okapies exliibited in the Museum alongside tlie one presented 

 by Sir II. Johnston. The skull associated with it in liaites, 

 from the circumstance that the premolars are not fully pro- 

 truded, that the latter is immature; and although the stature 

 of the atiimal may have attained its full development, it is 

 probable that there would have been some increase in the 

 size of the skull. Although no sexual features are shown in 

 the skin, Sir Harry Johnston's specimen is now generally- 

 regarded as a female ; and if this be the case, the same will 

 hold good for the one receritly in the possession of Mr. Ward, 

 Of the former the shoulder-height (as mounted) is 5 feet 

 1 inch (153 cm.), while that of the second is 5 feet and \ inch 

 (1523 cm.). On the other hand, the horned example pre- 

 sented to the Museum by Major Powell-Cotton stands only 

 4 feet 8^ inches (1-14*5 cm.) at the shoulder, while the some- 

 what younger one given by the late Mr. Boyd Alexander is 

 4 feet 5i inches (13C)"5 cm.). The former of these, as indi- 

 cated by the skeleton mounted in the same case, is adult, 

 although not old, and has, I infer, approximately reached its 

 full size. The length of the skull is 339 mm. 



In the memoir by ^I. Fraipont published in the ' Annales' 

 of the Congo ^luseum uo details are given with regard to the 

 height of the mounted specimens referred to ; but a horned 

 example at Madrid described by Sefior A. Cabrera in 1907 is 

 stated to stand 4 feet 5 inches (137 cm.) at the withers, and, 

 so far as I can recall, none of the mounted specimens with 

 horns which have been shown from time to time at Mr. Ward's 

 establishment were equal in size to the aforesaid hornless 

 examples. 



So far, then, as the evidence of the five specimens men- 

 tioned is concerned, it is manifest that the hornless individuals 

 exceed in height those with horns to an extent which can 

 scarcely be explaint d by difference of age, especially when it 

 is borne in mind that one of the hornless examples is imma- 

 ture, while at least one of those with horns is adult. Neither 

 does it seem that such differences are within the ordinary 

 limits of individual variation. 



On the other hand, it has to be mentioned that while the 



skull of Sir H. Johnston's immature hornless specimen 



measures 375 mm. in length, that of a horned okapi in the 



Tervueren Museum has a length of 377 mm. (Lankester, op. 



Ann. d- Ma<j. X. Hist. Ser. 8. Vol. vi. 15 



