LACERTIANS. 257 



twenty-eight premandibular teeth. All the teeth save the eight or ten 

 anterior ones have their summit divided into three points, which in the 

 earlier teeth are sharper than in the later ones. 



In the genus Centropyx some species, as the Centr. striatus, have 

 a few small pterygoid teeth on each side the palatal fissure : the 

 maxillary and intermaxillary teeth resemble those of the genus 

 Cnemidophorus. 



In the coelodont group of Lacertians the * Swift Lizards' (Tachy- 

 dromus) have the pterygoid bones armed with very small teeth, more 

 easily felt than seen : there are ten small, pointed, slightly recurved 

 intermaxillary teeth : twenty-six maxillaries on each side, and about 

 thirty premandibular teeth. The teeth in both jaws are closely 

 arranged, and the posterior ones are tricuspid. 



The dentition of the Tropidosaurs resembles that of the Tachy- 

 dromes : some species, as the Algira, have small pterygoid teeth. The 

 true Lizards, like the other Ccelodonts, have two kinds of teeth, the 

 anterior small, conical and recurved, the posterior larger, subcom- 

 pressed and bi-or tricuspid : the pterygoid teeth are occasionally 

 present, but are not constant either in the species of the genus or 

 the individuals of the species. There are commonly eight or ten 

 intermaxillary teeth ; from thirty to thirty-six maxillary teeth on each 

 side, and about forty teeth in each premandibular bone. 



The viviparous Lizard {Zootoha crocea) has no pterygoid teeth : 

 the common Lizard {Lacerta agilis) has about twelve conical ptery- 

 goid teeth on each side of the palatal opening. In this species may 

 be counted from eleven to thirteen intermaxillary teeth ; forty teeth 

 in each superior maxillary bone, and fifty teeth in each premandibu- 

 lar bone. 



The Lacerta ocellata and the Lacerta Galloti both have twelve 

 small conical obtuse pterygoid teeth on each side of the palatal 

 fissure. 



The remaining subgenera of coelodont Lacertians have teeth on 

 the jaws like those of the preceding species ; but they have no ptery- 

 goid teeth. 



