LÖNNBERG, ON A NEW ORYCTEROPUS FROM NORTHERN CONGO. 9 



male of the same species is also mucli narrovver anteriorly 

 wlien it leaves the frontal siiture than at fwamen lacrimale^. 

 In O. cethiopicus lacrimale is broadest at its posterior end at 

 for. lacrimale, and narrovver in front, but it extends only 

 along Vt, or 7» (Matschie) of the lower frontal suture. In 

 O. af er tJie lacrimale is as broad in front as behind and it 

 extends only along -/s or sometimes only '\h, of the lower 

 frontal suture. The greatest width (14,5 mm.) of lacrimale 

 in O. erikssoni is a little in front of the middle and it is as 

 broad (12 mm) at the point where it leaves the frontal su- 

 ture as at the anterior margin of for. lacrimale. It is in con- 

 tact with the lower frontal suture only along ^/r, of the length 

 of the same, but the whole length of the lacrimale is equal 

 to about '/lo of the length of this suture. 



The distance from the point where sutura nasomaxillaris, 

 s. nasointe7'maxillaris and s. maxillo-intermaxillaris meet, to 

 the gnathion of the anterior end of the intermaxillary is. 

 according to Matschie, about equal to half the length of 

 sutura nasalis in O. haussanus but in O. afer, cethiopicus and 

 erikssoni the former distance is much shorter than half the 

 latter. 



The snout and facial portion of the skull of O. erikssoni 

 is more strongly developed than the same in O. afer and 

 cethiopicus. This is apparent from the comparison made above 

 between the length of sutura frontalis and sutura nasalis of 

 the different species but it becomes still more confirmed by 

 comparison of some other measurements. In O. afer and 

 cethiopicus the distance from for. lacrimale to the anterior end 

 of sutura 7iasointermaxillaris is decidedly shorter than the 

 distance (measured in the mesial line) from the occipital 

 crest to sutura frontonasalis, but in O. erikssoni the contrary 

 condition prevails. From this comparison and others hinted 

 at above it appears that O. erikssoni is the most long-suouted 

 animal of the whole genus as far as the present knowledge 

 goes. This is, as it seems, mostly effected by the great de- 

 velopment of the praedental portion of the jaws. This is elu- 

 cidated by the following comparative measurements. In O. 

 erikssoni is the distance from the posterior side of the last 



^ According to a kind communication in a letter from my friend 

 Professor Matschie: »ist bei dem Togo-Stiick das Lacrymale vorn stark 

 verschmälert, vorn 6, am Vorderrande des Foramen 11 mm. hoch». 



