ANIMAL DENTISTRY. 39 



extremity. They cannot be said to be as perfectly juxta- 

 posited as in the horse, as the internal surface of the arcades 

 has deep depressions at the interdentia. The arcade will 

 average 12 centimeters long and from 15 to 22 millimeters 

 wide. 



The inferior molars are very narrow and closely juxta- 

 posited, as in the inferiors of the horse, but in shape and 

 arrangement of the enamel each tooth differs from the oth- 

 ers. The first is triangular in shape and contains but a single 

 ring of enamel. The second and third are rectangular and 

 their enamel is arranged into the form of an irregular figure 

 having five to six indentations. The fourth and fifth con- 



FlG. 28. 

 Table of a Superior Molar of the Ox. 



sist of two lobes, each having a central enamel ring and 

 infundibulum, while the sixth has three lobes with central 

 enamel infundibula on the two anterior lobes. The arcades 

 measure from 11 to 15 millimeters wide. The first three are 

 from 52 to 54 millimeters long and the posterior three meas- 

 ure from 88 to 93 millimeters in length. 



TEETH OF THE DOG. 



The dog has in all forty-two teeth — six incisors, two 

 canines and six molars in the superior jaw and six incisors, 

 two canines and seven molars in the inferior jaw. All of 

 the teeth of the dog are simple teeth, i. e., they are covered 

 with enamel on the table through life. The incisors are 

 small as compared with the other teeth, and they do not 

 contact each other until the dog is more than a year old. 



