No. 2.] SCAPULAR AND PELVIC ARCHES. 233 



Synopsis of Genera. 



I. Nostril pierced in the nasal, or between the nasal and supra- or post- 

 nasal or first upper labial, not touching the rostral. 



A. Palatine bones separated on the median line of the palate; no supra- 

 nasal shields. 



No azygos occipital shield; Egernia Gray. 



An azygos occipital shield in contact with the interparietal ; tail prehensile ; 



Corticia Gray. 



A A. Palatine bones in contact on the median line of the palate. 

 I. 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. 



a. No supranasals. 



Lateral teeth with obtuse or spheroidal crowns ; an azygos occipital in con- 

 tact with the interparietal ; subdigital lamellae divided ; Trachysaurus Gray. 

 Lateral teeth with obtuse or spheroidal crowns ; subdigital lamellae undi- 

 vided; Ttltqua Grzy. 

 An enormous crushing tooth on each side of each jaw ; 



Hemisphceriodon Ptrs. 

 /3. Supranasals present. 

 Lateral teeth with compressed, denticulated crowns ; a series of suborbital 

 shields ; Macroscincus Bocage. 



Lateral teeth conical ; two frontoparietals ; Mabtiia Fitz. 



Lateral teeth conical ; one frontoparietal ; Monophyaspis Cope. 



b. Pterygoids in contact (at least quite anteriorly) mesially, the palatal notch 

 not extending anteriorly to between the centre of the eyes. 

 * Eyelids movable ; digits with non-retractile claws, 

 t Supranasal plates present (tympanum not concealed) . 

 X Lower eyelid with a transparent disk. 

 § Frontoparietal single. 

 Digits 5-5 ; Emoa Gray. 



Digits 5-4 ; Hagria Gray. 



Digits 4-4 ; Chiamela Gray. 



§§ Two frontoparietals. 

 Digits 5-5 ; Riopa Gray. 



Digits 2-3 ; Eumecia Bocage. 



X% Lower eyelid scaly. 

 § Frontoparietal single. 

 Digits 5-5 ; Monophorus Cope. 



§§ Two frontoparietals. 



Digits 5-5 ; Lepidothyris Cope. 



tt Supranasal plates wanting. 



X Lower eyelid with a transparent disc. 



II Tympanum not concealed. 



§ Frontoparietal plate single. 



