242 IGUANIANS. 



4 



series, the cone is more or less obtuse ; but in general it is expanded, 

 more or less trilobate, or dentated along the margin of the crown. 



In the Polychrus, the anterior score of teeth are simple, slightly 

 recurved and obtuse ; the remainder are straight, compressed and 

 tricuspid. The pterygoid teeth form a single row on each bone, and 

 are short and conical. 



In the Urostrophus Vautieri (d. and b.) the upper jaw has forty- 

 six, or forty-eight teeth ; the lower jaw forty or forty -two teeth : the 

 anterior ten or twelve^ are conical with obtuse apices in both jaws ; the 

 rest are tricuspid. The pterygoid teeth are six or eight in number 

 in each bone, and present the form of moderately wide cones. 



The Anolians have the same anterior conical, and posterior com- 

 pressed tricuspid teeth as in the previous genera ; but the latter are 

 relatively fewer in many of the species : in Anolis loysiana, for exam- 

 ple, out of fifty-four teeth in the upper jaw only the eight or nine 

 posterior ones are distinctly compressed and tricuspid : and this form 

 is restricted to the hinder six or seven of the forty premandibular 

 teeth. In the Anolis chloro-cyaneus fourteen of the sixty maxillary and 

 twenty of the fifty-six premandibular teeth are tricuspid ; these are as 

 usual at the posterior part of the series. 



In the Anolis Carolinensis four or five of the posterior tricuspid 

 teeth are sensibly larger than the rest. In the Anolis alligator 

 {Lacerta himaculata, Shaw), there are three or four short but strong 

 teeth on each pterygoid bone. The Anolis chamcBleonoides resembles 

 the chameleons not only in external appearance, but in its dentition, 

 in so far as that none of the teeth present the tricuspid form : the 

 thirteen anterior ones are pointed, the others simply obtuse : there are 

 sixty two upper and fifty lower teeth in this species. 



The genus Chamaleopsis {Corythophanes, Boie) has the posterior 

 teeth tricuspid as in the ordinary Anolises. 



The dentition of the Basilisks differs little from that of the Anolis ; 

 the posterior teeth are rather trilobate than tricuspid : the anterior ones 

 are small, circular, pointed and shghtly curved : there are generally 

 from five or six conical teeth on each pterygoid bone, but in the 

 Mitred Basilisk there are twelve teeth in each of these rows. 



In the Aploponoti, the pterygoid teeth are arranged in two series on 

 each side. 



