THE DEVELOPMENT OF THE TEETH. 125 



In the lizards the new tooth germs are formed a very long 

 way beneath the surface, so that the neck of the enamel 

 organ becomes enormously elongated, for the dentine papilla 

 is, just as in the newt, situated at first quite at the level of 

 the floor of the area of tooth development. The teeth of 

 the lizards have a more complete investment of enamel, 

 hence the enamel cells are developed upon the side of the 

 dentine germ to a much lower point than in the newt. The 



germs also acquire an adventitious capsule, mainly derived 

 from the condensation of the connective tissue around 



( ] ) Transverse section of the lower jaw of common English Snake, e. 

 Inward dipping process of epithelium. /. Oral epithelium. 1, 2, 3, &c. 

 Tooth germs of various ages. 8. Tooth in place, cut somewhat obliquely, 

 so that its tip apparently falls short of its surface, and does not project 

 above the mucous membrane. 



