THE GREAT CHIMPANZEE. 403 



13. The alisphenoid extends outwards more beyond the ecto-pterygoid before it 

 ascends upon tlie side of the cranium. 



14. The greater length of the spheno-maxillary fissure. 



15. The more outward development of the malar process of the maxillary. 

 IG. The squarer form and less oblitjue plane of the orbits. 



17. The prominence of the upper half of the nasal bones. 



18. The narrower and less produced muzzle (alveolar part of premaxillaries and 

 contiguous parts of maxillarics lodging the canines). 



19. The absence of orbito-malar foramina. 



20. The greater breadth of the interorbital space. The smaller size of the orbito- 

 sphenoids (lesser alx of the sphenoid). The greater development of the frontal 

 sinuses. 



21. The greater breadth of the sella turcica and the wider separation of the optic 

 foramina. 



22. The minor convexity of the roofs of the orbits at the sides of the olfactory fossa. 



23. The ento-jugular process of the petrosal, and the size, shape and position of the 

 aquccductus vestibuli with its overhanging plate. 



24. The configuration of the grinding surface of the premolars and molars. 

 The Pithecus Wurmbii more nearly resembles Man : — 



1. In the greater relative extent of the convex part of the calvarium. 



2. In the minor prominence of the supraorbital ridges. 



3. In the greater length and breadth of the upper part of the alisphenoids, which 

 more commonly join the parietals than in the Chimpanzee. 



4. In the greater proportion of the orbital plate of the sphenoid, and the less propor- 

 tion of that of the malar. 



5. In the larger size and squarer form of the lachrymal, which joins more constantly 

 and to a greater extent the os planum (orbital part of prefrontal). 



6. In the greater length and depth of the pterygoid fossae. 



7. In the triangular form of the fissura lacera anterior. 



8. In the deeper fossae for the natiform protuberances. 



9. In a minor development of air-cells in the squamosal and aUsphenoid. 



These characters of nearer approach to Man, besides being fewer in number, are of 

 less importance in the Orang, since they depend for the most part on the inferior deve- 

 lopment of characters which are nevertheless present, and which are strictly apish, 

 distinguishing both the large anthropoid species from Man, and only not equally so, 

 because they are j)resent on a larger and more decided scale in the skull of the Chim- 

 panzee, and give it a more brutish and forbidding physiognomy. 



