THE SLOW-LEMURS. 25 



cally longer than the median, while both the median and pos- 

 terior have, to the outside, one main cusp with a minute one on 

 each side of it, and two inner cusps; the molars are all cingulate, 

 and have to the outside two main cusps (separated by a minute 

 cusp) and two inner cusps, the outer and inner cusps alterna- 

 ting. Of the anterior and median molars, the two main out- 

 side cusps are sub-equal, and are flanked on each side by a 

 minute cusp ; the posterior molar is short and wide, and has 

 only one minute cusp in front of its anterior main cusp. Of 

 the lower jaw, the pre-molars are canine-like, the anterior being 

 vertically long and having a posterior heel ; the posterior pre- 

 molar, which differs in size from the anterior, presents two 

 main cusps to the outside and one minute cusp in front ; the 

 molars, both anterior and median, are four-cusped, with a 

 minute cusp in front, the posterior being five-cusped, while all 

 have their front cusps vertically taller than the hind ones. 



Among the Lorisince the dorsal and lumbar vertebrae together 

 number from ' twenty-one to twenty-three. The caecum, at 

 the junction of the larger and smaller intestine, is long. The 

 main artery of the fore- and hind-limbs breaks up into a rete 

 viirahile of numerous small parallel branches. 



The Slow-Lemurs are distributed in the western parts of 

 the African continent, and in the Indian, Malayan and Indo- 

 Chinese portions of the Oriental region. It is a remarkable 

 fact that this group should be confined to one portion of 

 Africa and be entirely absent from Madagascar, the country 

 where the Lemurs form so characteristic a feature in the fauna. 



The Lorisince embrace three genera, the Pottos {Perodicticus) 

 from the African continent ; the Slender Loris {Loris)^ and the 

 Slow-Loris {Nycticebus\ both of which inhabit the Oriental 

 region. 



