314 DK. E. RAT LANKESTEE OX OKAPIA. 



PLATE XXXII. 



Fig. 11. View of the right side of the smaller skull drawn in fig. 1, Plate XXXI. 

 The drawing is reduced to three-eighths of the natural size. — Reference letters : 

 a, the supraorbital tumescence of the frontal bone (site of the future ossicusp 

 or bony horn-core) ; c, the pra?Iacrymal vactfity. The tumescence of the base 

 of the nasal bones is well seen in profile. 



Kig. 12, View of the right side and right I'amus of the lower jaw of the larger of the 

 two skulls, viz., that drawn in Plate XXXI. fig. 2. The drawing is reduced 

 to three-eighths of the natural size. The basal part of the cranium is broken 

 away in this as in the smaller skull, and the maxillary teeth of the right side 

 only are preserved. — Reference letters : «, the supraorbital tumescence of the 

 frontal bone ; i, the absent praeraaxillary bone, sketched in lightly of pro- 

 portionate size from the same region of the smaller skull ; c, the prajlacrymal 

 vacuity ; d, the median tumescence of the base of the nasal bones ; e, the 

 parietal bone ; f, the occipital crest ; y, the three anterior incisors and canine 

 of the lower jaw. The extremely small relative size of this group of teeth, as 

 compared with the dimensions they exhibit in the Giraffe (and all other 

 Pecora), should be realized by comparing this figure with the text- figure 12, 

 representing the skull and lower jaw of a very young Giraffe, reduced to very 

 nearly the same scale, that of the young Giraffe being one-ninth larger in 

 scale. 



Fig. 13. The molar teeth of the right upper series of the larger of Sir Harry Johnston's 

 two skulls of Okapi, showing the crowns. The third true molar is broken and 

 therefore not figured. — dni^, the anterior milk-molar, not yet slied ; ^m-, the 

 second premolar, exposed by the shedding of the second deciduous molar, but 

 not yet "cut"; pii^, the third premolar, exposed by the shedding of the third 

 deciduous molar, but not yet cut ; m^ anterior or first true molar (cut) ; 

 m", second true molar (cut). 



Fig. 14. The molar teeth of the right upper series of the smaller skull of the Okapi. — 

 Am}, din^, dm^, the three deciduous molars ; m^, the first true molar. The second 

 true molar had been cut, but is not preserved in the specimen ; the third true 

 molar had not yet been cut. 



