134 ON RUDIMENTARY ANTLERS IN THE OK API. [Feb. 5, 



Text-fig. 54. Text-fig. 55. 



Text-fig. 54. — Drawing of the right ossicone (not j'et ankylosed) of the Okapi 

 brought by Capt. Boyd Alexander from the Welle River. 



The relative age of this Okapi is indicated by the fact that whilst the deciduous 

 molars are still in place in everj' socket, yet thej' are ver^^ much worn and all 

 the true molars in both upper and lower jaw are " through " and moderately 

 worn. 



Text-fig. 55. — Section through the tip of the same specimen to show the incomplete 



trabeculated ossification, contrasting with the dense ivory-like ossification of the 



ossicone of Major Cotton's specimen (Plate VII.). 

 The relative age of this Okapi is shown by the fact that the deciduous molars are all 



shed and the premolars moderately worn, whilst the molars are all " through " 



and moderately worn. 



the larger and older ossicone, whilst less spongy than that of the 

 smaller and younger one.j 



EXPLANATION OF THE PLATES. 



Plate VI. 



Figs. 1 to 8 represent various views of the " horn-tips " of the ossicones or 

 ossicusps of the Okapi in the Royal Scottish Museum, Edinburgh, of 

 the natural size (Specimen A). 



Figs. 1, 4, 5, and 7 are views of the left horn-tip. 

 Figs. 2, 3, 6, and 8 are views of the right hom-tip. 



Fig. 1. Left ossicone, outer side ; y, depression due to shedding of a piece of the 

 bone. 



2. Right ossicone, inner (mediad) side ; x, cup-like cavitj- due to shedding of a 



portion of the bone. 



3. Right ossicone, outer side. 



4. Left ossicone, inner (mediad) side; i/ as in fig. 1. 



5. Left ossicone, from behind and below. 



6. Right ossicone, from behind and below. 



7. Left ossicone, from in front and above. 



8. Right ossicone, from in front and above ; .r as in fig. 2. 



Figs. 9 to 12 represent two views of the " horn-tips " of the ossicones of a 

 specimen of Okapi lent by Messrs. Rowland Ward and now in 

 America (Specimen B). 

 Fig. 9. Left ossicone, outer side. 



10. Right ossicone, outer side. 



11. Left ossicone, from in front and above. 



12. Right ossicone, from in front and above. 



