REPTILES. '277 



Destitute of lateral expansions. 



Furnished with palatine teeth. Head plated. Throat 

 with a dilatable pouch. Body and tail with imbricated 

 scales. Thighs with glandular pores. 



21. IGUANA. Body and tail furnished dorsally with a 

 longitudinal crest, of vertical scales. Lacerta Iguana. 



22. POLYCHRUS. Destitute of a dorsal crest. Lacerta 

 marmorata. 



Destitute of palatine teeth. 



(AA.) Tail covered with rings of large scales. 



Head enlarged behind by muscles of the jaws. 



23. STELLIO. Ear surrounded with spines. Thighs des- 

 titute of glandular pores. Toes long and pointed. Lacer- 

 ta stellw. 



Head simple. Glandular pores on the thighs. 



24. CORDYLUS. Both the belly and back covered with 

 rings of scales, many of which are spinous. Lacerta cor- 

 dylus. 



25. MASTIGURA. Scales of the body small^ smooth, and 

 uniform. M. spinipes. 



(BB.) Scales of the tail not annulated. 

 Scales -on the back forming a crest. 



Crest covered with scales. It is supported by spinous 

 processes of the vertebrae. 



26. BASILICUS. Basilisk. Teeth strong and compres- 

 sed. Lacerta basilicus. 



Crest formed of single scales. Scales on many parts of 

 the body carinated and pointed. 



27. CALOTES. Crest confined to the back. Lacerta 

 calotes. 



