io ALLEN'S NATURALIST'S LIBRARY. 



or two smaller or subsidiary ones on the crown ; the cingulum 

 is well developed. The posterior molars have generally three 

 cusps. 



In the lower jaw the incisors are close-set and comb-like, 

 remarkable for protruding in front, like the teeth of a Rat or a 

 Rabbit. The canines also protrude horizontally, and, being 

 placed alongside of the incisors, are difficult to distinguish from 

 the latter excepting that they are broader and thicker. 



Fig. 4. Skull of Lemuroid. Fig. 5. Skull of Anthropoid. 



From Blanford's " Mammalia From Blanford's "Mammalia of 



of British India " (by per- British India " (by permission 



mission of the author). of the author). 



Of the pre-molars the anterior are canine-shaped, the median 

 and posterior ones have three main, and one or two sub- 

 ordinate, cusps on the crowns. In both the upper and lower 

 molars, cross-bridges stretch between the outer and inner front 

 cusps as well as between the outer and inner hind cusps. 



