CHAP. Vl] THE DENTAL SYSTEM OF THE PRIMATES 



247 



In the Orang-utans .supernumerary molar teeth are extraordinarily frequent, 

 and particularly so in the male sex : the additional tooth is usually placed be- 

 hind the third molar 1 . This subject will be further discussed in connection 

 with anomalies of the dentition. The great length' of the roots of all the 

 teeth has been remarked as a characteristic feature of the dentition of the 



Fig. 174. 



Fig. 175. 



Fig. 172. Pig. 173. 



Fig. 17'2. Pdght upper canine and post-canine teeth of an Orang-utan (ad. 3 

 W. L. H. D. priv. coll.). 



Fig. 173. Left lower canine and post-canine teeth of an Orang-utan (ad. <? 

 W. L. H. D. priv. coll.). 



Fig. 174. Right upper canine and post-canine teeth of a Gorilla (ad. <f W. L. H. D. 

 priv. coll.). 



Fig. 175. Left lower canine and post-canine teeth of a Gorilla (ad. j W. L. H. D. 

 priv. coll.). 



Orang-utan (cf. Tomes, Dental Anatomy, ed. 1898), while reference to Figs. 

 172 and 173 shews that the Orang-utan. provides an excellent illustration of 



1 Cf. Bolk in Koninklijke Akademie van WetenscMppen. Proceedings, April 27, 

 1906, p. 789. 



