150 



DE, H. P. STANDING ON SUBFOSSIL 



with certain of the South-American forms, as the accompanying figure shows (text- 

 fig. 45). 



It should, moreover, be noted that the obliquity of the orbits is apt to disguise the 

 extent to which the frontal in reality enters into the formation of the brain-case. 



Again, it has been urged that the horizontal direction of the facial extension of the 



Text-fig. 45. 



Showing backward extension of frontal of Palceopropithecus compared with that of Chirojootes. 



Text-fig. 46. 



Facial angle of (A) Alouaita helzehul compared with that of (B) Mesojpropitheciis pithecoides. 



frontal off'ers no analogy to the condition seen in the Monkeys. We have found, 

 however, m the case of Archceolemur , and especially of Mesopropitliecus, that this 

 region of the frontal is by no means horizontal, but forms a true " forehead." In 

 text-fig. 46 the profile of Mesopropithecus is compared with that of Alouatta, the facial 



