CLASSIFICATION OF VERTEBRATA 25 



with sutural symphysis. Pectoral girdle at least vestigial, 

 except in the degraded families, 13-17. 



1. Sub-order GECKONES, Spix. Lepospondylous. With 

 columella cranii. Sternum, girdles and limbs complete. Eibs 

 prolonged ventrally across into abdominal ribs. Cosmopolitan, 

 warmer zones. About 270 species. 



G-eckonidae. Amphicoelous ; parietal bones distinct. 



Gecko, Teratoscincus, etc. 

 Uroplatidae. Amphicoelous; parietal single. 



Uroplates in Madagascar. 



Eiiblepliaridae. Probably a heterogeneous group. Pro- 

 coelous ; parietals fused into one. 



West Africa, Central America, Indo-Persia. 



Eublepharis, etc. 



2. Sub-order LACERTAE, Spix. Stereospondylous, pro- 

 coelous. With columella cranii, except in most of the burrow- 

 ing, degraded families. Cosmopolitan. About 1300 recent 

 species. 



1. Agamidae. Acrodont ; without supra temporal arch ; 

 without osteoderms. Tongue thick and short. With postorbital 

 and postfronto-squamosal arches. Limbs well developed. Asia 

 and SE. Europe, Africa excluding Madagascar, Australian region. 



Calotes, Draco, Agarna, Chlamydosaurus, Uromastix, 

 Moloch, etc. 



2. Iguanidae. Pleurodont, without supratemporal arch ; 

 without osteoderms on body. Tongue thick. 



With postorbital and postfrontal arches. Limbs well 

 developed. 



America, Madagascar, Fiji, and Friendly Islands. 



Anolis, Basiliscus, Polychrus, Iguana, Phrynosoma. 



Amblyrhynchus. Galapagos ; algivorous. 



Chalarodon and Hoplurus in Madagascar. 



Brachylophus. Fiji and Friendly Islands. 



3. JCenosauridae, Differs from Iguanidae by the teeth 

 not being hollow at base, and by 'the anterior part of the 

 tongue being retractile. 



Xenosaurus grandis. Mexico. 



4. Zonuridae. Like the Iguanidae, but the supra- 

 temporal fossa is roofed over by dermal bones. Distinguished 



4 



