1889.] Synopsis of the Families of Vertebrata. 867 
A clavicle proximally simple ; an anchor-shaped 
interclavicle ; a columella; tongue papil- 
lose, not sheathed ; Iguania. 
III. Prootic bone not produced beyond arched body; 
dentition pleurodont, or nearly so ; two suspensoria. 
a. Clavicle simple proximally ; olfactory lobes not un- 
derarched by frontal. 
Interclavicle cruciform ; tongue papillose ; Diploglossa. 
aa. Clavicle proximally simple ; olfactory lobes under- 
arched by frontal. 
Vertebrae procoelous ; tongue smooth ; Thecaglossa. 
Vertebrae amphicoelous ; tongue papillose; Geccovarani. 
aaa. Clavicle proximally expanded ; olfactory lobes un- 
derarched by os frontale. 
Tongue papillose or smooth ; Nyctisaura. 
aaaa. Clavicles, when present, expanded proximally; 
olfactory lobes not underarched. 
Clavicles, interclavicle, and sternum present ; 
surangular distinct ; tongue scaly ; Leptoglossa. 
Clavicles, interclavical and sternum absent; 
tongue scaly ; Typhlophthalmi. 
IV. Prootic bone produced beyond arched body ; one sus- 
pensorium (=supratemporal wanting) ; pelvic arch rudi- 
mentary or wanting. 
Frontal bone underarching olfactory lobes ; su- 
praoccipital gomphosis internal ; no orbito- 
sphenoid ; Anguisauri. 
Frontal bone underarching olfactory lobes ; su- 
praoccipital gomphosis external ; an orbito- 
sphenoid ; Opheosauri. 
The families of these suborders are the following : 
Rhiptoglossa ; Chama^leonidae. 
Acrodonta ; Agamidae. 
Iguania ; Iguanidae, Anolidae. 
Diploglossa; Zonuridae, Pygopodidae, Anguidae, Xenosauridae, 
Helodermidae. 
Thecaglossa ; Varanidae. 
