404 



MAMMALIAN ANATOMY 



number of upper teeth, the denominator the number of lower teeth, 



of any one kind : Milk teeth = di -, dc -, dm . 



3 1 2 



Permanent teeth = / r , c -, pm '-, m -. 



The teeth are numbered from the middle point of the jaw in 

 front backward ; for example, the internal lower incisor is the first 



incisor,. expressed by-; the middle incisor is the second, - -; the 



i 1 i 2 



lateral incisor is the third, ; and so on. 



i o 



FIG. 319. 



Inrisors. 



Canine. 



Premolars. 



Molar. 



Condyle.- 

 LOWER JAW, FROM ABOVE. 



It must be borne in mind when reading works on Comparative 

 Anatomy and Zoology that in the permanent set the premolar and 

 molar teeth are very generally numbered not as they appear in the 

 jaw, but according to what is believed to be their relative value 



