l!28 CLASS REPTILIA. 



A remarkable species is, 



The LophyruSf with Forked Casque, Agama Gigan- 

 tea. Kuhl. Seb. I. c. %. 



Which has its dorsal crest very high on the nape, 

 and formed of several ranks of vertical scales. Two 

 osseous ridges proceed from the muzzle, and finish 

 each in a point over the eye on its side joining the 

 temple. This singular Saurian appears to come from 

 the Indies.* 



The Gonocephala. Kaup. 



Approximate pretty closely to these lophyri. Their 

 cranium also forms a kind of disk, by means of a 

 ridge, which terminates above each eye by an inden- 

 tation. They have a crest upon the nape. Their 

 tympanum is visible. t 



The Lyriocephala. Merrem. 



Unite to the characters of the lophyri that of a 

 tympanum, concealed under the skin and under the 

 muscles, as in the cameleons. They have also a 

 dorsal crest, and a carinated tail. 



In the species which is known (^Lyriocephalus 

 Margaritaceus, Merr. ; Lacerta Sentata, L.), Seb. cix. 

 3, the osseus crest of the eyebrows is still more 



* It is not easy to say why Kuhl has given to this Saurian the epithet of 

 gigantic. Its size does not exceed that of the Agama and Calotes, which 

 are the nearest to it. 



f Isis, 1825, I. p. 590, pi. iii. 



