1904.] FOREST-PIG OP CENTRAL AFRICA. 199 



hand, nor of the specialised hypsodont nature of those of Phaco- 

 chcerus on the other, but at least it may be said that they present 

 a basis out of which the latter might have been formed. Their 

 structure will be better seen by the figures than by a detailed 

 description, though attention may be drawn to the resemblance of 

 m^ to that of PhacocJuerus, and to the development of the median 

 secondary cusps of the lower teeth, these having each its obvious 

 homologue in the complicated hypsodont molars of the derivative 

 form. 



The measurements of the typical skull are as follows (the 

 older imperfect skull is only infinitesimally larger, so that the 

 type has evidently reached its full size) : — 



Greatest median length above 415 mm. ; basal length 355 ; 

 zygomatic breadth 213 ; nasals, length 235, breadth 52 ; inter- 

 orbital breadth 95 ; tip to tip of postoi'bital processes 124 ; inter- 

 temporal breadth 92 ; breadth across lateral occipital protuberances 

 116; height from basion to top of occipital crest 123 ; least breadth 

 of maxillary zygomatic processes 57 ; breadth across sockets of 

 ■canines 130; breadth between tips of canines 217; palate length 

 252 ; least palatal bi'eadth (between m") 44 ; basal diameter of 

 canine (c.) 34 ; horizontal length of p'^ 9, p^ 12"5, mp^ 14, m^ 18"5, 

 m^ 26, m^* 38. 



Lower jaw — length (bone only) 320 ; breadth across symphysis 

 at base of canines 111 ; least breadth across diastema 82 ; height 

 at diastema 45 ; tip to tip of canines 200 ; lower canines — basal 

 diameter of outer face 19, inner face 20, posterior face 12"5; 

 horizontal length of Pj 15, m^ 19, m^ 26'5, va^ 41. 



In conclusion, I may congratulate Lieut. Meinertzhagen on the 

 interest and importance of his capture and ourselves as zoologists 

 on the discovery of so fine a •' missing-link" as Hylochmrus proves 

 to be. And I would express the hope that before long specimens 

 of this animal may be received in a condition fit for movmting, 

 while further skulls of difterent ages will elucidate the develop- 

 ment of its dentition. 



EXPLANATION OP THE PLATES. 



PlATE XIV. 



Sylochcerus meinertzhageni. 



Skull of type ; upper, lower, and lateral views. 



Plate XV. 



Syloclicerus meinertzJiageni. 



Figs. 1, 2. Skull of type, anterior and posterior views. 

 Pig. 3. Upper cheek-teeth, right side, of type. 



4. Lower ditto. 



5. Upper cheek-teeth, right side, of older specimen. 



