378 



A MANUAL OF DENTAL ANATOMY. 



from side to side, and have an anterior and a posterior 

 sharp ridge ; they are also slightly flattened on their inner 

 surfaces. 



The premolars are flattened from side to side, pointed, 



FIG. 164 ( 2 ). 



increasing in size from before backwards, and have small 

 basal accessory cusps (see fig. 163). The fourth upper pre- 

 molar is the sectorial tooth, and is very much larger than 

 the third premolar ; the blade is well pronounced, ' and the 



(*) Dentition of Australian Dog (Canis dingo). 



( 2 ) Milk and permanent teeth of Dog (after Prof. Flower). 



