THE LIZARD. 139 



corresponding maxilla, and forming the posterior half ot 

 the ventral boundary of the orbit, and the ventral half of its 

 posterior boundary : a process of it extends forwards, within 

 the maxilla, almost to the anterior boundary of the orbit : 

 its posterior inferior region is produced into a blunt, back- 

 wardly -directed spur (see 47). 



46. The postorbitals, roofing bones, articulating one 

 with the outer border of each parietal. 



47. Between the outer border of the postorbital, the anterior border 

 of the quadrate, and the posterior border of the jugal, lie a number of 

 small, irregular, scale-like bones, which form a continuous bony sheet 

 behind the orbit, covering the posterior portion of the jugal, to see which 

 they must be removed. 



48. The prefrontal, a small bone, intercalated on each 

 side between the anterior lateral region of the frontal and the 

 ascending process of the maxilla, and extending downwards 

 to the anterior border of the orbit. 



49. The supraorbitals, two rows of small bones form- 

 ing the upper boundary of each orbit : the inner row, 

 articulating with the outer border of the frontal, and extend- 

 ing between the prefrontal in front and the postorbital 

 behind, consists of four bones, of which the foremost and the 

 hindmost are considerably smaller than the intermediate 

 ones : the outer row consists of five small bones, the 

 hindmost of which forms the upper part of the posterior 

 border of the orbit, while the others bound its dorsal 

 border. 



50. The lacrymal, a small bone perforated by an 

 aperture for the lacrymal duct, situated just within the 

 anterior boundary of the orbit, and articulating externally 

 with the ascending process of the maxilla. 



51. The supratemporals, two bones on each side, of 

 which the first overlaps the posterior edge of the postorbital, 



