1907.] RUDIMENTARY ANTLERS IN THE OKAPI. 



Text-fig. 52. 



131 



The diagram C shows the direction iu which certain cuts have been made in the 

 left osseous horn (ossicone or ossicusp) of the Edinbiirgh Okapi (also illustrated 

 in PL VI. figs. 1 to 8). 



a, anterior border ; h, posterior border. L, left side ; R, right side. 



A is a drawing three times the natural size of the cut surface of the bisected horn, 

 the bisection being effected in a plane erected on the line ah of the diagram C. 

 It shows the eating in of the transverse fissm'es into the dense bony substance, 

 and a number of irregular spaces and fissures which are probably cavities due to 

 re-sorption of the bone. B is a drawing of the other half of the same bisected 

 horn-tip. 



Text-fis-. 53. 



Drawing of three times the natural size of the surface of a section obtained by 

 cutting half of the same bisected horn-tip through a plane erected on the line R 

 of the diagram, separating the shaded from the iinshaded area. The penetration 

 of the transverse fissures is shown. The cavities m, n, o correspond to the 

 transverse fissures labelled in, n, o in fig. 5 of Plate VI., representing the same 

 specimen before it was divided. 



9* 



