KUNQL: SV. VET. AKADEMIBNS HANDLINGAR. BAND. 58. N:0 2. 



41 



small process on the frontal ridge over each orhit near end of nasals », about which the 

 author quoted speaks, is also present, but it is nothing characteristic to this race of Ba- 

 boons, nor to Baboons as for instance a similar process can be seen in Cercocebus skulls 

 as well (cf. PL XII, fig. 2). 



The nasals of the females and the young animals are anteriorly flat and not raised, 

 (cf. PI. VII). In the females the lateral parts of the snout are not swollen, nor forming 

 elevated ridges. In the males on the other hand this masculine characteristic begins 

 to ^how at a very early period. Already in the quite young male with only milk -dentition 

 a swelling or inflation is apparent in the upper anterior portion of the maxillary ( PL 

 VII, fig. 1 ). In the young male with the first molar developed this inflation is still larger, 

 but it is yet evenly rounded off (PL VII, fig. 2). In the semiadult with the second molar 

 developed the swellings are already very large (PL VII, fig. 3); there is a deep and broad 

 pit on the sides of the maxillary above the roots of the molars, and the upper surface 

 of the rostrum displays longitudinal grooves between the elevated nasals and the lateral 

 swellings. The la;tter have, however, still a smooth surface and are broadly rounded off 

 on the sides. Finally in the adult (PL VII, fig. 4) the rostrum gets its definite shape; the 



1 Last molar not yet visible, c not much higher than first premolar. 



2 Only first molar developed, dc present. 

 = Only milk-dentition. 



« From Hoima, Uganda. • 



K. Sv. Vet. Akad Handl. Band 58. N:o 2. 6 



