16 A MANUAL OF DENTAL ANATOMY. 



larly in the root. The cornu of the pulp which corresponds 

 to the inner cusp is but feebly developed. 



The second lower bicuspid differs a good deal from the 

 first ; its crown is much squarer and larger in all its dimen- 

 sions. The inner cusp reaches to a higher level and is 

 stouter, and the greater development of the ridge which 

 bounds the posterior (distal) border of the grinding surface 

 makes it attain to such a large size as to make the tendency 

 towards a transition from the bicuspid type to the quadri- 

 cuspid type of a true molar very evident. 



Having completed the brief description of the forms of 

 these several teeth, it is worth while to note one or two 

 general characters of the series. The differences between a 

 well-marked incisor, canine, or premolar are so strongly 

 pronounced that the resemblances which underlie them are 

 apt to be overlooked, and it might be supposed that in shape 

 they had little in common. 



Nevertheless a very distinct gradation may be traced, and 



FIG. 6 O. 



it is far from uncommon to meet with teeth which possess 

 in a marked degree transitional characters. If the external 

 or distal angle of a lateral incisor be sloped off more than 

 usual, while at the same time its cingulum and basal pro- 

 minence be well marked, it makes no bad imitation of a 



( : ) Lower first bicuspid, seen from the inner side, and showing the pre- 

 ponderance of its outer over its inner cusp. 



