Anderson, The Notes on the Temporal bone in Mammalia etc. qoq 



has 2 pms. and i molar, so that the cranium appears large and 

 the jaws small. A chimpanzee (2) with last two molars not emer- 

 ged gives the antero-posterior measurement of squamosal part as 



5.2 cms, Vertical 2.2 cms. The upper border of squamosal is 

 7 cms below sagittal, but if a "Wormian" bone be excluded 6 cms. 

 The coronoid of Mandible is 9 cms from the middle line of skull 

 above and 4 cms from lower border of the mandible. The supra- 

 orbital prominences are distinct but the other lines are not di- 

 stinct. Tympanic flattish below and in front. Internal pterygoid 

 fossa is continued up to a groove that leads on up to Eustachian 

 aperture. Mastoid, the external surface is prominent especially 

 below where it joins the occipital. 



A Chimpanzee with a thick (hydrocephalic) skull, no 

 molars up, has Ant. post. 5.2 cm. Height 2.3. Temp. Par. Suture 

 7 cms from sagittal suture, 2.8 cms from zygoma. A Wormian 

 bone is not counted in with squamous. Its height is 1 cm, if 

 added the height would be 3.3 cms, and this may represent the 

 products of the 2nd (bipartite) centre. The distance from sagittal 

 would be then 6 cms. The petrous is more prominent than the 

 basilar. The tympanic is prominent and the mastoid has a con- 

 vex outer surface that runs on to the external surface of the 

 occipital. 



Hylobates leuciscus. Ant. post. sq. 2.5, frontal ext. fossa 

 1 cm. Temporal (adult) vertical 1.5. Parietal vert. 2. Parietal 

 does not reach sphenoid. Temporal ridge barely visible. Depth 

 of mandible 1.75 cm. at Coronoid process, nearly same as distance 

 of Coronoid from Temporal ridge. The Mastoid surface is flattish. 



Hylobates agilis. Ant. post. temp. 3.8 cm. Vertical 1.2 cms. 

 Temp. -parietal suture to crest 2.8 cms. Crest to mid. line 1.5 cm. 

 Coronoid to crest 4.5 cms. Coronoid to lower border 2.4 cms. 

 Tympanic prominent, L-shaped and curved. It extends from 

 Eustachian to external tabes. The Mastoid is flattish. 



Hylobates Mulleri. Ant. Post. 3.5 cms. Vertical height 0.7 cm. 

 Lower (Antr.) edge of base of zygoma to temporal ridge 4.2 cms. 

 Ridge to sagittal suture 1.8 cms. Coronoid to temporal crest 



4.3 cms. Coronoid to lower border jaw 2.7 cms. 

 Semnopithecus sp. The mastoid part which is convex is one 



fourth the antero-posterior measurement of temp. mast. The 

 vertical height is proportionally greater. Ant. post. temporal 

 equal to 3 cms. Breadth of sphenoid in temp. fossa is 1 cm. 



The temporal reaches frontal in Semnopithecus obscurus, and 

 Semnopithecus maurus, as it does in Gorilla and Chimpanzee 

 sometimes. It nearly reaches frontal in Semnopithecus entellus. 



Semnopithecus maurus. Ant. -post. sq. 2.6 cms. from front, 

 to back and 1.5 cms in height. The temporal crest is 2.1 cms 

 above temporal, and 2.1 cms from middle line. The coronoid 

 process is 3.6 cms below the crest, and 3.6 cms above lower border 



