THE SKELETON OF THE DOG. THE TEETH. 



375 



become so intimately connected with the skull that they appear 

 to belong to the endoskeleton. 



Each tooth, as has been already described, consists of three 

 distinct tissues, dentine and cement of dermal origin, and 

 enamel of epidermal origin. 



FIG. 68. DENTITION OF A DOG (Canis familiaris) x ^. (Camb. Mus.) 

 i 2. second incisor. pm 1, pm 4. first and fourth pre- 



c. canine. 



molars. 

 m 1. first molar. 



The teeth of the dog (fig. 68) form a regular series arranged 

 along the margins of both upper and lower jaws, and imbedded 

 in pits or alveoli of the maxillae, premaxillae, and mandibles. 



