Ids 



DR. E. EAT LANIvESTEE ON OK API A. 



natives and received in this country '. But there is evidence that the integument was 

 very closely applied to the bone of the supraorbital bosses and that there was a specially 

 vascular condition of the periosteum in the centre of the boss. A figure (text-fig. lo) 

 of this appearance is here given. The hair on the integument is arranged so as to 

 converge on the centre of the boss, and there is a distinct upstanding of the hairs around 

 it and a bare spot at the actual centre (text-tig. 14, p. 299, a and c). The arrangement 



Tcxt-fiff. 13. 



Drawing (natural size) of a portion of the skull of the Okapi (larger specimen), to show the surface of the 

 right frontal hoss. The surface of the bone shows numerous grooves occupied by blood-vessels, indicating 

 that the periosteum was here in close vascular continuity with the subcutaneous connective tissue. 



[The peculiar vascular condition of the surface of the bone at the supraorbital tumescence now receives its 

 explanation in the later growth liere of the bony tissue to form the large conical ossicusp. — May 27th, 

 1902.] 



of the hair over the two orbital bosses {a and c) and above the nasal tumescence (r/), 

 as shown diagrammatically in text-tigure 14, p. 299, is very remarkable. 



It is improbable that at this age and size our Okapi, if a male, had yet to develop 



' The existence of such a rudiment was at iirst supposed by me to exist, and a notice bj' mo in an 

 illustrated weekly paper is quoted by Dr. Diirst (loc. cit.) to that effect. I found, however, on cutting open 

 the skin of the head after it had been received from the taxidermist that there were no thickenings of the 

 integument over the frontal bosses, but that the taxidermist had taken the liberty of inserting a smaU plug 

 of cotton-wool over each frontal boss, so as to give a strongly marked prominence to the integument in this 

 position. — E. 11. L., April 30th, 1902. It now appears (May 23rd) that my original supposition was probably 

 correct, since the Brussels skuU of an adult Okapi shows ossicusps three inches in length, though their mode 

 of growth is not yet ascertained. 



