LACERTILIA. 



341 



Fig. 186.— Skull of Uromastix (after original drawings by J. -J. Lister). A dorsal, B ventral, 

 C posterior, D side view, E and F lower jaw. i premaxilla : 2 maxilla ; .'i prefrontal ; 

 4 palatine ; .5 transpalatine ; 6' jugal ; 7 pterygoid ; 8 quadrate ; .'* squamosal ; 10 

 exoccipital and opisthotio ; 11 basioccipital ; 12 supraoccipital ; 13 posttemporal fossa ; 

 14 supratemporal bone ; 15 supratemporal fossa ; 16 postfrontal : 17 pineal foramen ; i.s 

 olfactory capsule ; 19 vomer ; Si) parietal ; 21 frontal ; 22 nasal ; 23 columella cranii 

 (epipterygoid) ; 24 basisphenoid with which a basitemporal ossification has united ; 25 

 columella auris ; 2H prootic ; 27 alisphenoid cartilage ; 28 parasphenoid ; 29 septomaxillary ; 

 3(1 Meckel's cartilage ; 31 articular ; 32 coronoid ; 33 supraangular ; 34 dentary ; 35 

 angular ; 3ii splenial. 



median backward process of the parietals, thus forming the 

 casque of the^e skulls. 



The lower jaw contains the usual six bones (Fig. 186), and the 

 distal end of Meckel's cartilage persists. The two rami are 

 usually firmly connected at the symphysis. The hyoid consists 

 of an elongated body, and two long cornua on each side. It is 

 mainly cartilaginous the posterior cornua being partly ossified. 

 In the geckos the anterior cornua are connected to the skull. 



