CLASS REPTILIA 537 



digits in groups of two and three, for grasping (see 

 Fig. 452)- 



Family i. CHAM^LEONTID^. CHAMELEONS. With 

 characters of the suborder. Examples: Chamcdeon 

 (Fig. 452), Brookesia, Rhampholeon. 



Suborder 2 . SAURIA (LACERTILIA) . LIZARDS. S QUAMATA 

 with transverse anal opening; paired copulatory organs ; 

 at least a vestige of,a pectoral arch; usually well- 

 developed limbs ; rami of lower jaw united. (Only ten 

 of the twenty families are listed below.) 



Family i . GECKONIDJE. GECKO. S AURIA with four legs ; 

 eyes usually without movable lids; tongue protrusible; 

 many with adhesive digits for climbing. Examples: 

 Gecko (Fig. 453), Gymnodactylus , Spharodactylus. 



Family 2. AGAMID^:. OLD-WORLD LIZARDS. S AURIA 

 with well-developed limbs; eyes with complete lids; 

 tongue broad and short; teeth usually differentiated 

 into incisors, canines, and molars (heterodont) , and 

 always situated on the edge of the jaw (acrodont). 

 Examples: Draco (Fig. 454), Gonycephalus, Calotes. 



Family 3. IGUANID.E. NEW-WORLD LIZARDS. SAURIA 

 resembling AGAMID.E, but usually with teeth similar 

 (homodont) and fastened in a groove (pleurodont) . 

 Examples: Anolis, Sceloporus, Phrynosoma (Fig. 457), 

 Iguana (Fig. 456). 



Family 4. ANGUID.E. OLD and NEW-WORLD LIZARDS. 

 SAURIA with teeth in a groove; anterior part of tongue 

 thin, and retractile into posterior part; limbs present 

 or absent; body protected by bony plates. 



Family 5. HELODERMATID.E. BEADED LIZARDS. SAURIA 

 with grooved teeth ; poisonous; tongue.bifid, protractile; 

 limbs short but strong. Examples : Heloderma (Fig. 459) . 



Family 6. VARANID/E. MONITORS. SAURIA with tongue 

 long, smooth, deeply bifid and retractile; tail long; 

 limbs well developed. Example: Varanus. 



