INTRODUCTION. 



xxv 



In another specimen of C. cancrivorus there was no third lower molar, 

 but a rosette made up of five very small denticles in its place (fig. 11, 

 p. xxiv). A third upper molar has also been found in C. cancrivorus, 

 and Professor Mower, C.B., has observed a second upper molar in a 

 specimen of Icticyon venaticus. 



In Domestic Dogs abnormalities are more frequent, especially in the 

 form known as the Japanese Pug, in which the teeth may be extraordi- 

 narily defective, as will be noted when we come to treat of the domestic 

 Dog. 



Almost always the fourth upper premolar and the first lower molar 

 are larger than the others, with sharp cutting-blades which play one 

 against the other, on which account they are often spoken of as the 

 " sectorial " or " carnassial " teeth. In Otocyon, however, they hardly 

 differ in this respect from those adjacent to them. Taking the teeth of 



Fig. 12. 



Side view of the teeth of a Wolf. 



such a form as the Dingo or the Wolf as a type of the Canida, we find, 

 if we compare it with the teeth of one of the Felidce, or Cats, that the 

 incisors are larger relatively both above and below. The four median 



