11 years, Upper Jaw. The marks Lave disappeared. 



C 



The Mark, dissected a& it 

 were. (See page 58.) 



c, The Dentinal star, some- 

 times mistaken for the 

 mark. (See page 209.) 



12 years, Lower Jaw. Change in shape is now clearly denned. 

 The respective pairs (centrals, dividers, corners) assume in turn 

 (from 12 years till old age) various shapes semi-square, rounded, 

 triangular, wedge-shaped, etc, 



