352 Osteological Description of the 



which is peculiar to the rhinoceros, and renders its pyramid 

 almost straight. In the hog even, which has a pyramid al- 

 most similar, it is inclined hackwards. 



The contour of the occipital is a semi-ellipse, which be- 

 comes broader towards its base, to produce a projecting 

 plate behind the foramen of the ear and the posterior base 

 of the zygomatic arch. 



The line of the base exhibits at its middle the condyles, 

 and at the sides the mastoid apophyses pointed and hooked: 

 in the hog they are exactly under the condyles. Before 

 each of these apophyses is another very large one, which 

 belongs to the temporal bone, and which contributes to form 

 the articulation of the jaw; it prevents it from moving much 

 from right to left, and it corresponds with an indentation 

 situated at the interior extremity of the Condyle. 



Between these two apophyses, but a little more inwards, is 

 another short apophysis, the end of which is hollow, and 

 reeeives the os styloides. 



The impressions of the muscles divide the occipital face 

 of the four fossa?.: the anterior face of the pyramid de- 

 scends, always becoming broader between the eyes, where 

 the post-orbitar apophyses of the frontal are the most di- 

 stant limits. The point of the nose completes the forma- 

 tion of the rhomboid, which characterizes the upper face 

 of the whole cranium. The region between the eyes is 

 concave in the longitudinal direction, and plane in the 

 transverse ; that of the bones of the nose becomes convex 

 in every direction. 



The parietals begin a little before the summit of the 

 pyramid ; they terminate towards the middle of the space 

 between that ridge and the orbitar apophyses ; the sutures 

 analogous to the coronal, and the lamdoid are perfectly 

 transverse. 



The scaly suture, or the limit of the parietal and temporal 

 in the temporal fossa, is parallel to the direction of the an- 

 terior face of the pyramid. 



The large ala of the sphenoid ascends only very little in-* 

 to the temporal fossa, and this bone is not articulated with 

 the parietal. 



The posterior half of the zygomatic arch belongs to the 

 temporal; all the rest belongs to the os jugale or the cheek 

 bone. 



The direction of the arch is like an Italic S, descending 

 obliquely from behind forwards : its inferior edge is very 

 thick in my adult individual, and projects considerably ; it 

 is much less in the young subject given by M, Camper. 



Tho 



