8 ALLEN'S NATURALIST'S LIBRARY. 



I. THE LEMURS SUB-ORDER LEMUROIDEA. 



The Aye- Aye, the Tarsier, and the True Lemurs constitute 

 this first sub-order. They are characterised by having the 



Fig. I. Lemuroid Ear. Fig. 2. Anthropoid Ear. 



muzzle long and narrow, more or less Dog-like in shape, and the 

 upper lip often divided into two by the nose-pad. The external 

 ears (Fig. i) are enlarged, with flattened margins, but have no 

 ' hem " as in the higher Anthropoids. (Fig. 2.) 



The trunk is relatively long and compressed, and the tail 

 when long is never truly prehensile. Of the limbs, the pos- 

 terior are longer than the anterior, and all have five digits, each 

 bearing a flat nail except the second toe, which has invariably 

 a long pointed claw, their tips ending in prominent discoidal 

 tactile pads. (Fig. 3.) 



Of the digits, the index is sometimes quite rudimentary, 

 while the thumb is large, and the great toe especially so, both 

 being opposable. Teats occur on the breast, on the abdomen, 

 or on both. 



Of the skeleton, the eye-sockets, or orbits, are directed for- 

 ward, and have complete bony margins, which, however, are not 



