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. Ofthe 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 Zorviseve@ the dorsal and lumbar vertebree together 
number from twenty-one to twenty-three. The cecum, at 
the junction of the larger and smaller intestine, is long. The 
main artery of the fore- and hind-limbs breaks up into a rede 
mirabile 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 Zoristne embrace three genera, the Pottos (Perodicticus) 
from the African continent ; the Slender Loris (Zovr7s), and the 
Slow-Loris (Vyctecebus), both of which inhabit the Oriental] 
region. 
