IGUANIANS. 241 



Polychrus, Urostrophus, Anolis, Corythophanes, Basiliscus, AploponotuSy 

 Amblyrhynchus , Iguana, Metopoceros, CycluruSy Brachy tophus, Leio- 

 saurus, Hypsibates, Procfotretes, Ecphymotes, Stenocercus and Oplurun. 



The following pleurodont genera of Tguanians have no pterygoid 

 teeth, Hyper anodon, Tropidolepis, Phrynosoma, Callisaurus. 



The Acrodont Iguanians include the genera Istiurus, CaloteSy 

 Lophyrus, Otocryptis, and Chlamydosaurus in all of which the maxillary 

 teeth may be divided into anterior laniary and posterior molary teeth. 



In the crested Istiurus of Amboina the four anterior simple 

 conical teeth in both upper and lower jaws are very small and repre- 

 sent incisors ; the six following teeth, three on each side, are larger, 

 more sharply pointed and incurved ; they are followed by thirteen 

 molars with compressed, triangular, trenchant, but undivided crowns, 

 which gradually increase in size as they are placed backwards ; the 

 posterior ones being strong teeth, separated by intervals. 



In the blue Calotes may be distinguished five incisors in the 

 intermaxillary bone, a median and two shorter ones on each side ; a 

 single long laniary and eighteen or nineteen tricuspid molars on each 

 side of the upper jaw. In the lower jaw there are two canines on 

 each side. 



The molars are more close-set and numerous in the Lophyri, 

 there being sometimes twenty on each side, these are obtusely tri- 

 cuspid. 



In the Otocrypt {Otocryptis bivittata) the intermaxillary bones 

 each support a single tooth, which is conical and straight; the third in 

 succession, in the superior maxillary bone, is a very large laniary, with 

 a slightly recurved point. Of the twelve molars which succeed these, 

 the anterior are small, simple and compressed ; they increase in size 

 and complexity as they recede backwards, the large posterior molars 

 having three lobes, but the series is terminated by teeth of small size 

 and simple form. 



The Chlamydosaurus presents a similar dentition, but the teeth 

 are relatively larger, and a greater proportion terminates in simple and 

 pointed summits. 



In the pleurodont Iguanians the teeth never present the true 

 1 laniary form ; and if simply conical, as at the extremes of the maxillary 



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