EXTINCT ANIMALS 



and fifteenth years of life. The first big molar 

 comes into place in the fifteenth year, and lasts 

 for ten years, when its place is taken by the 

 second, which is already showing its crown in 



Fig. 76. — Lower jaw of an Indian Elephant, sliowing two molars 

 on each side, the front ones wearing away as the back ones 

 come up into position. The transverse ridges on the 

 teeth are well seen. 



the twentieth year. The third comes forward 

 in the same way about twenty years later. 



The molar teeth of the Indian elephant and 

 of the mammoth have a great number of narrow 

 transverse ridges set across the crown of the 



no 



