216 



CHARLES R. STOCKARD AND A. L. JOHNSON 



matic width the English bulldog is far above the other two, 

 but this is due almost entirely to the general differences in 

 skull size, and the type value of this character is about equal 

 in all three skulls. 



The relation of the total anteroposterior dimensions of the 

 maxillary premolar teeth to the maxillary premolar region 

 is highest in the Boston terrier, next in the French bulldog 

 and lowest in the English bulldog. The same relation holds 

 for the total mandibular premolar anteroposterior dimensions 

 to mandibular premolar region. This means, of course, that 



I 



BOSTON TERRIER 



1 FRENCH BULLDOG 



| ENGLISH BULLDOG 



LIMITS OF VARIATION 



; 



ENGLISH BULLDOG 

 FRENCH BULLDOG 

 BOSTON TERRIER 



: - 





Text-figure 53. Comparison of skull measurements and indices of the Boston 

 terrier, Trench bulldog and English bulldog. The values indicated are based 

 on averages of actual measurements of nine English bulldog, four French bulldog 

 and five Boston terrier skulls. 



