132 SCINCTD^. 



B. Palatine bones in contact on the median line of the palate (fig. 6). 



1. T)-mpanum, if distinct, more or less deeply sunk. 



a. Pterygoid bones separated on the median line of the 

 palate, the palatal notch extending anteriorly to an 

 imaginary line connecting the centre of the eyes (fig. b). 



a. No snpranasals. 



Lateral teeth with obtuse or sphoeroidal crowns ; an azygos occipital 

 in contact with the interparietal; subdigital lamcUfe divided. 



3. Trachysaurus, p. 142. 



Lateral teeth with obtuse or sphaeroidal crowns ; subdigital lamellae 

 undivided 4. Tiliqua, p. 143. 



An enormous crushing-tooth on each side of each jaw. 



5. HemisphaBriodon, p. 148. 



j3. Snpranasals present. 



Lateral teeth with compressed, denticulated crowns ; a scries of 

 suborbital shields 6. Macroscincus, p. 149. 



Lateral teeth conical 7. Mabuia, p. 150. 



6. Pterygoids in contact (at least quite anteriorly) mesially, 

 the palatal notch not extending anteriorly to between the 

 centre of the eyes (fig. c). 



Eyelids movable ; digits, if present, with non-retractile claws. 



8. Lygosoma, p. 209. 



Eyelid immovable, transparent, covering the eye. 



9. Ablepharus, p. 344. 



Eyelids movable ; claws retractile into a sheath. 



10. Ristella, p. 356. 



2. Tympanum exposed and superficial. 



Head normal 11. Tropidophorus, p. 359. 



Head a bony casque, well separated from the neck. 



12. Tribolonotus, p. 364. 



ale 



a. Palate of F.gcrnia whifii. b. Of Mabuia oavinata. 

 c. Of Lygosoma olivaceum. 



The dotted line indicates the position of the centre of the eye. 



