132 SCINCIDE. 
B. Palatine bones in contact on the median line of the palate (fig. 5). 
1. Tympanum, 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. 6). 
a. No supranasals. 
Lateral teeth with obtuse or spheroidal crowns ; an azygos occipital 
in contact with the interparictal; subdigital lamelle divided. 
3. Trachysaurus, p. 142. 
Lateral teeth with obtuse or spheroidal crowns; subdigital lamellee 
Undivided. swstsoereas as seas sa0% 4. Tiliqua, p. 143. 
An enormous crushing-tooth on each side of each jaw. 
5. Hemispheriodon, p. 148. 
B. Supranasals present. 
Lateral teeth with compressed, denticulated crowns; a series of 
suborbital shields ............ 6. Macroscincus, p. 149. 
Lateral teeth conical ............ 7. Mabuia, p. 150. 
b. Pterygoids in contact (at least quite anteriorly) mesially, 
the palatal notch not extending anteriorly to between the 
centre of the eyes (fig. ¢). 
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. 
a b c 
a. Palate of Egernia whitii. 6. Of Mabuia carinata. 
e. Of Lygosoma olivaceum. 
The dotted line indicates the position of the centre of the eye. 
