274 PHILOSOPHY OF ZOOLOGY". 



1. CCSTA. Dorsal scales small and smooth. 



Some of the species, as Lacerta bicarinata, have the tail 

 with a crest, while, in others, as L. teguexin, the tail is 

 smooth. The teeth are notched. Under each thigh there- 

 is a row of pores. 



Tail rounded. 



1%. AMEIVA. Head sub-pyramidal. Lacerta Ameiva. 



(B.) Scales on the head, belly and tail, small and imbri- 

 cated. 



14. MONITOR* This genus was formerly termed Tu- 

 pinambis, by a mistake of Seba. There appear to be indica- 

 tions of three divisions. 1. Tail compressed and carinated, 

 as M. elegans. 2. Tail round and carinated, as Lacerta 

 Nilotiea. 3. Tail round and plain as the monitor of Egypt. 



a. Tongue short, and limited in its motion. Number of 

 toes indeterminate. 



(A.) Feet furnished with suckers. 



The suckers occur on the under side of the toes, the 

 surfaces of which are broad. They consist of transverse 

 pouches, with fringed margins. These enable the animal 

 to climb perpendicular walls, like the common house fly *.. 

 The tail has circular folds. 



Teeth serrated. 



15. ANOLIUS. The antepenult joint of the toe enlarged 

 to form the sucker. 



The body is shaped like the lizards. The throat, in 

 some of the species, is capable of inflation, and of changing 

 colour. There are palatine teeth. Several species are na- 

 tives of America, some of which have rounded tails, and 

 others where a crest may be observed. 



* See an interesting " Account of the feet of those animals, whose pro- 

 gressive motion can be carried on in opposition to gravity," by Sir EVE- 

 BARD HOME, Phil. Trans. 1816, p, 149, 



