IKEEaULARITIES OF THE TEETH. 



In Fig. 21, both middle incisors are double. 



99 



Fig. 21. 



In Fior, 22, we have a front and back view of a mouth 

 with a middle permanent supernumerary incisor, lying 

 across the jaw. 



Fig. 22. 



H 2 



