76 COPE 



II. Petrosal produced anterior to semicircular canal, 

 not articulating above with the edge of the parietal. 



a, Clavicle proximally expanded ; olfactory lobe 

 underarched by frontal. 



Tongue papillose or smooth ; hemipenis 



calyculate ; 4 Nydisaura. 



aa, Clavicle proximally simple ; olfactory lobes 

 underarched by frontal. 



Vertebrae amphicoelous ; no supratem- 



poral arch ; tongue papillose ; 5 Urolatoidea. 



Vertebrae procoelous; a supratemporal arch; 

 interclavicle anchor-shaped ; tongue 

 smooth ; hemipenis flounced ; 6 Thecaglossa. 



Vertebrae procoelous, no supratemporal 

 arch ; interclavicle simple ; tongue 

 papillose ; hemipenis flounced ; 7 Helodermatoidea. 



aaa, Clavicle simple proximally, olfactory lobes 

 not underarched by frontal. 



Interclavicle cruciform ; tongue papillose ; 



hemipenis flounced ; 8 Diploglossa. 



aaaa, Clavicle proximally expanded ; olfactory 

 lobes not underarched. 



Vertebrae procoelous ; tongue scaly ; hemi- 

 penis flounced or plicate ; 9 Leptoglossa. 



III. Petrosal produced anterior to the anterior semi- 

 circular canal, articulating above with the border 

 of the parietal. 



a, Olfactory lobes underarched by frontals, no 

 supratemporals, nor ceratohyals ; cervical and 

 caudal intercentra coossified with the middle 

 of the centra. 



