106 ALLEN'S NATURALIST'S LIBRARY. 



hair forming a fringe all round. Median nose-pad high and 

 narrow ; pupil of eye circular ; body elongated ; arms about 

 one quarter of the length of the legs ; hands very long, the four 

 outer fingers united by a membrane as far as the first joint, and 

 the toes to the centre of their middle segments ; hands and feet 

 haired to the tips. Tail rudimentary. 



Skull longer and less vaulted ; brain-case proportionately 

 more compressed from side to side ; the muzzle longer, and 

 the orbit smaller, than in Avahis ; floor of orbit higher than 

 the bony margin of the jaw ; inter-orbital space flat ; nasal bones, 

 though long, not extending in front as far as the end of the pre- 

 maxillary bone ; mandible elongated, narrower, and less deep 

 than in Avahis. Bony palate short, posterior margin thickened, 

 and with a foramen behind the posterior molar ; line of union 

 of the two halves of the lower jaw shorter than in Avahis ; 

 its angle very large. No central bone in the wrist (or 

 carpus] ; hind-limb (with or without the foot), compared with 

 the fore-limb (with or without the hand), longer than in any 

 other of the Primates, except Galago. Upper teeth: Incisors, 

 sub-equal, set close together and subject to variation in size ; 

 canine, vertically taller than, and not separated by a gap from, 

 the pre-molar; pre-molars compressed, and havingan inner cusp; 

 anterior molars, four-cusped, with the supplementary cusps 

 weak, and with no oblique ridge ; anterior and median, with 

 their outer and inner cusps opposite; posterior molar, which is 

 the smallest grinder of the jaw four-cusped, with transverse, 

 but no oblique ridges. Lower teeth: Incisors, with marked 

 longitudinal ridges to the outside (peculiar to this genus) ; pre- 

 molars sub-equal; molars all four-cusped, and the posterior ones 

 expanded behind. 



Brain highly organised. A large laryngeal pouch (present 



