92 



DE. H. P. STANDING ON SUBFOSSIL 



The median incisors have thus been brought into close proximity, in all probability, 

 indeed, meeting in the middle line. Unfortunately the incisors are missing in all the 

 specimens, but the alveoli give us indications for determining their position and 

 direction. This region of the palate is more strongly developed than in any of the 



Text-fig. 17. 



d 



£ 



Nasalia of («) ArchceoUmur edwardsi and (6) Mesopropiihecus pithecoides, compared with each other 

 and with those of (c) Propiihecus and of three Monkeys {d) Pitheeia leticocephala, (e) PitJiecia 

 rujlventer, and (/) Chirojwtes ater. 



extant members of the subfamily, and it is very probable that the front teeth still 

 functioned as true " incisors," being used for biting and nibbling, as in the case of 

 Archceolemur . The nasal aperture is almost circular in form in the one skull where 

 the margins of the encircling bones are intact. 



The Tenvporal Region. — As stated above, the zygomatic arch spreads widely away 

 from the skull, the malar process taking a somewhat upward direction as in 

 Archceolemur. This malar element does not extend backwards along the whole lower 

 border of the arcade, though forming a longer horizontal suture than in Palceopra- 

 jnthecus. The anterior part of the arch has a much smaller vertical extension than 

 the posterior, the maximum and minimum heights being respectively 16"5 mm. and 

 7 mm. The whole arcade has a far greater thickness than that seen in any of the 

 extant genera, its conformation, indeed, presenting a strong contrast with these latter 

 and closely allying it with Archceolemur. The zygomatic process of the squamosal 

 bears some resemblance to that of Propithecus, but it is again more massive in every 

 way and differs also from the latter in having a much greater forward extension of the 

 horizontal plate which connects the skull-wall and the vertical portion of the arcade. 

 This fact, combined with the very convex curvature of the whole arch, has given at 

 this point a nearly circular horizontal section to the temporal muscle, again recalling 

 the condition of Palceop'opithecus and Archceolemur rather than that of Propithecus 

 and Indris, where the temporal fossa is elongated in a direction parallel to the long 

 axis of the skull. 



The sharp superior margin of the zygomatic arch is continuous by a long flat 



