THE FAT-TAILED LEMURS, 61 
Length of body, 8% inches ; tail, 13 inches; skull high and 
arched ; outer and hinder portion of ear-capsules (periotic- 
bones) and squamosal swollen; frontal bone longer than in 
Opolemur and Chirogale , occiput less sloping from behind 
and above forwards and outwards. Upper median and pos- 
terior molars with one inner and two outer cusps, united by 
a curved ridge, cingulate all round, and with a small cusp or 
cingulum at the hind inner angle ; posterior pre-molars smaller 
and shorter than the molars, with strong and vertically longer 
outer cusp, anda much more feeble inner cusp; posterior lower 
molar lengthened behind by a fifth cusp. 
Distribution.—Coquerel’s Dwarf-Lemur, or the “ Sisiba,” as 
the natives call it, is found round Passandava Bay, near Mouroun- 
dava, on the south-west coast of Madagascar. 
Habits.—The Sisiba, like its congeners, is nocturnal and 
arboreal, constructing in the trees a nest of twigs. It feeds 
on fruits and leaves. 
THE FAT-TAILED LEMURS. GENUS OPOLEMUR. 
Dpolemur, 1%. Gray, P. Z. 5:,. 1872, p.. 853. 
The term Ofolemur, by which this genus is designated, is 
not altogether appropriate, and is, indeed, even somewhat mis- 
leading. It was applied in the first instance to the typical 
species on account of the thickened base of its tail, which in 
the type-specimen was a very conspicuous character. The 
deposit of fat by which this thickening was caused was not 
then known to be merely transitory—a store of food collected 
at the base of the tail and on other parts of the body, to supply 
the needs of the animal during the arid and foodless season, 
when it retires into-a state of torpidity. It is now known that 
