HO ORGANS OF SUPPORT, 



alone separates the the two large temporal muscles 

 from each other. The sides of the cranium often assume 

 a compressed form, especially where the temporal muscles 

 are of great force as in the hyaena and in old carnivora, where 

 many of the cranial sutures also disappear. The mastoid 

 process (A. r,) forms a large cavity or bulla communicating 

 with the tympanum, and enlarging the organ of hearing in these 

 as in other nocturnal animals. The zygomatic arch (e, e,) is 

 of great magnitude and strength, and is convex above. The 

 temporal fossse are continuous with the orbits from the de- 

 ficiency of the frontal, (B. #,) and the malar bone (B. A,) 

 behind the orbits, and the zygomatic process (B. c, d,) 

 extends laterally at a right angle from the squamous por- 

 tion (A. c,) of the temporal, in order to form a long trans- 

 verse glenoid cavity for the transverse articular condyle (A. #,) 

 of the lower jaw. The parietal bones (b, b,) early anchylose 

 in the animals of this order, so as to resist the tearing action 

 of the temporal muscles, which have a great surface for inser- 

 tion on the large coronoid process (A. t,) which forms the 

 entire ramus of the lower jaw. There is a strong ossified 

 tentorium extending inwards between the brain and cerebel- 

 lum, to protect these delicate organs from the effects of their 

 leaping and bounding movements. The infra-orbitary fora- 

 men (/, /,) is large for the nerves of the upper part of the face, 

 and the upper part of the nasal cavity is enlarged for the 

 ethmoid and turbinated bones, by the great breadth of the nasal 

 process (k, k,) of the superior maxillary bone and of the nasal 

 bones, (z, i.) The intermaxillaries (o, o,) contain each three 

 teeth, the outer of which are the largest, and the canine teeth 

 (w, ,*) above and below are large, conical, curved, and insert- 

 ed in very deep alveoli, (m, m.) The large transverse condyle 

 (A. #,) of the lower jaw is little raised above the base, and is 

 secured in a very deep glenoid cavity of the temporal bone 

 that the jaws and teeth may meet with great precision, 

 especially the molar teeth which have sharp cutting crowns 

 (A. u, v, w,) directed longitudinally, and entirely covered with 

 a very dense and thick layer of enamel. The anterior small 

 detached molar teeth (w,) behind the canine (n y ) are the false 

 molar es ; the larger prominent cutting molar tooth, with a 

 tubercle at the interior of its base, is the carnivorous tooth ; 

 (A. u,} ; and the flat broad-crowned tuberculated teeth, which 

 are more or less developed behind these are the tuberculated 



