102 



Journal of Agriculture, Victoria. [10 Feb., 1919. 



Plate VIII. — At ten years, 

 o indicates groove at the side of the upper corner incisor 



Plate IX. — Fifteen years. 



h indicates groove reaching half-way down 

 the corner incisor. 



Plate X. — Twenty years. 



Groove extends whole length of the 

 corner incisor. 



