148 DK. C. I. EOESYTH MAJOR ON THE [Peb. 19, 



Br. M. No. 78.8.30.4 ; S. sabanus, Br. M. No. 93.3.4.3) the lacrymal 

 shares' with the maxillary the anterior boundary of the fossa. 



Colobus (PI. XII. fig. 3). 

 The lacrymal is slightly more developed in front than in 

 Semmpiihecus, thus more approaching the condition attributed to 

 the latter genus by Gregenbaur. 



Nasalis. 

 In Nasalis (PL XII. fig. 11) the antero-superior angle of the 

 lacrymal and its lateral portion — the hamulus-region — extend 

 forwards ; between them, the maxilla borders the fossa and 

 sometimes even descends into it. As the crista anterior is, 

 however, much flattened, a condition approaching Ateles is the 

 result. 



Papio. 



Papio is the very reverse of Semnopithecus. In the 52 specimens 

 examined, the anterior margin of the fossa is, almost without any 

 exception, formed by the lacrymal alone (PI. XI. figs. 9 & 10). 

 In ten specimens the crista anterior is supported exclusively by 

 the lacrymal, which in several individuals expands forwards 

 beyond the crista ; so that, whenever the crista ant. is flattened — 

 an occurrence met with in young and adult specimens (PI. XI. 

 fig. 9) — the fossa is as much extra-orbital as in many cases of 

 Mycetes and Ateles. 



In the majority of specimens the crista anterior is formed by 

 the lacrymal in conjunction with the maxilla. 



CynopitJiecus. 



In CynopitJiecus the conditions nearly resemble those of the 

 preceding genus. In the seven skulls examined, the lacrymal, 

 however, never protrudes on the face, the crista anterior being 

 always formed by both lacrymal and maxilla. In three cases the 

 boundary of the anterior margin of the fossa is supplied exclusively 

 by the lacrymal. 



Macacus. 



Seventy-nine skulls have been examined. In eight specimens 

 the condition of the lacrymal was found to be similar to that 

 prevailing in Semnopithecus, viz., the crista anterior formed by the 

 maxillary alone, which generally descends also into the fossa. The 

 eight specimens belong to M. philippinensis (2), M. cynomolgus, 

 M. radiatus, M. pileatus, M. rhesus, M. speciosus, M. sp. (Br. M. 

 No. 45.1.8.4). In six cases — M. silenus, M. philippinensis, 

 M. cynomolgus (2), M. rhesus, M. sp. (Br. M. No. 69.3.5.15)— the 

 maxillary forms the larger portion of the anterior boundary of 

 the fossa. Conversely in one instance, an old individual of 

 M. nemestrinus (Br. M. No. 28 c) (PL XII. fig. 12), the extreme 

 condition of some specimens of Papio is approached, the lacrymal 



