4 REPTILES. 



4. Lacertinid^. Supra-orbital plate bony. Teeth hollow, root- 

 ed. Scales small, granular or lozenge-shaped. Old world. 



** Sides with a distinct longitudinal fold covered with small 



granular scales. 



5. ZoNURiD^. Ears distinct. Limbs distinct, or rarely quite 

 hidden. 



6. Chalcidj;. Ears hidden under the skin. Limbs very short ; 



femoral pores none. Lateral fold indistinct. 



*** Sides rounded, covered with scales like those on the back. 



7. Anadiad^. Scales of the back and sides thin, imbedded, 

 smooth, in alternating cross series ; of the tail elongate, smooth, 

 in longitudinal series. Ears distinct. Femoral pores distinct. 



8. Chirocolid^. Scales of the back imbricate, 6-sided, lanceo- 

 late, keeled, narrow, in cross series ; of the tail in rings, alter- 

 nating with each other. Ears hidden. Femoral pores distinct. 



9. Cercosaurii)^. Scales of the back, sides, and upper part 

 of the tail keeled, in longitudinal series. Limbs 4 : feet for 

 walking. 



10. Cham^ssaurid^. Scales imbricate, all elongate, rhombic, 

 keeled, in longitudinal series, the keels forming longitudinal 

 ridges. Limbs simple, undivided. Temple scaly. 



Tribe II. Geissosaura. Scales of the belly and (almost always) of 

 the back and sides quincuncial, rounded, imbricate. Sides 

 rounded. Tongue narrow, short, flat, end slightly nicked. 

 Head with regular shields. 



a. Eyes distinct, exposed, eyelid rudimentary. Head conical. 



n. GymnophthalmidtE. Head-shields normal. Nostrils lateral, 

 in a nasal shield. Limbs 4 or 2. Body fusiform. 



12. Pygopid^. _ Head-shields normal. Nostrils over the upper 

 edge of the first labial. Pupil round or oblong. Abdominal 

 shields 6-sided, in 2 or 3 series. Tail with a central series of 

 larger shields. Limbs 2, posterior. Australasia. 



13. ApRASiADiE. Head-shields normal. Nostrils in a suture be- 

 tween the nasal and first labial, (sometimes united ?). Limbs 

 none. Ventral and dorsal scales nearly similar. Australasia. 



14. LialisiDjE. Head-shields subimbricate, scalelike. Cheeks 

 scaly. Nostrils in a small single nasal on ridge of the face. 



