430 A MANUAL OF DENTAL ANATOMY. 



lower jaw, so that these two teeth can be to a slight extent 

 separated from one another. 



The upper canine is often present as a very minute 

 rudiment, but in no kangaroo does it attain to a greater 

 size. 



The dentition of the Kangaroo is somewhat perplexing 

 to, the student, for two reasons : the one, that the last or 

 third permanent premolar not only displaces the solitary 

 milk molar, but also, as in Hypsiprymnus, on account of its 

 greater size, the second permanent premolar, which was in 

 front of the milk molar ; and, besides this, in animals past 

 adult age, teeth are shed off from the front of the molar 

 series till at last only the last two true molars on each side 

 remain. 



Thus the dentition of the kangaroo at successive ages 

 may be thus represented : 



.301 14 



1 r ' o p T dm I m ? 



or, in all, six molar teeth. Then the third premolar dis- 

 places the second true permanent premolar as well as the 

 milk molar, and we have 



i j e - p - (a new one) m -, 



or, in all, only five molar teeth. 



Then, one after another, teeth are shed off from the front 

 of the molar series, just as in the Phacochserus (see page 

 328), till all that is left is 



3002 

 i i c - p - m -. 



The milk molar of the kangaroo is a fully-developed 

 tooth, which takes its place with the other teeth, and is not 

 distinguished from them by any special characters, so that 

 mere inspection of the jaw of a young Kangaroo having 

 it in place, at the same time with a premolar in front of it 



