' WART-HOGr 221 



their full growth, of both sexes, have, in the inter- 

 maxillary bone, two incisors, which have their 

 crowns turned inward, and their roots sharply 

 pointed in an outward direction, wedged into the 

 lower plate of the intermaxillary bone. These 

 upper incisors are of greater size in males than in 

 females, are generally larger in animals that have 

 obtained their full growth than in younger ones, 

 and do freely rise a few lines above the axis of 

 the palate. In the lower jaw, we observe six 

 incisors, which are not wanting even in the very 

 old animals. The lower incisiors, to the number 

 of six, have invariably been found of larger size 

 in old animals than in young ones, and none of 

 the oldest individuals we possess want either of 

 these teeth. 



Second, The upper corner teeth have on their 

 outer and inner surface a groove, which is con* 

 tinued with the curve at the teeth. This groove 

 is wanting in the lower corner teeth, which in old 

 animals are by a third smaller than the upper 

 ones. 



Third, In all which we used for our general 

 description, both in young animals and such as had 

 obtained their full growth, of both sexes, we found 

 ~n the upper jaw four back teeth, and three in 

 the lower jaw. The first and second are small^ 

 narrow, roundish, with simple crown-globules, 

 and with two roots wedged into two separate 



