THE TARSIERS. 19 
limb, with or without the hand, is longer than the trunk ; its 
digits also are long and slender (the third being longest, and 
the second equal to the fourth) and, like those of the foot, 
terminate in round sucker-like discs. Both the wrist and ankle 
are haired. 
The long and Rat-like tail is longer than the body, and 
has a tufted termination. The skull presents enormous eye- 
cavities, the inner margins of the latter almost meeting in the 
centre. The orbits are nearly closed in from the temporal 
fossa by the union of the malar and alisphenoid bones—a 
character in which they differ from all other Lemurs, and 
approach the Anthropoid section of the Primates. Their 
dental formula is 12, Cl, P?, M3=34. Of the upper jaw, the 
incisors are prominent and unequal, the anterior ones being 
larger than the posterior, and in contact in the middle line, 
thus leaving no central gap in the front of the jaw, as is the 
rule among Lemurs; the canines are about as long vertically 
as the inner incisor, and are smaller than the corresponding 
tooth in the True Lemurs; the pre-molars are canine-like, 
sharp, pointed, and furnished with a cingulum; the anterior 
pre-molar is smaller than the two others ; the posterior pre- 
molar has one external and one internal cusp ; the molars, all 
nearly equal in size, are wide transversely, strongly cingulate, 
and have two prominent external cusps. In the lower jaw, 
the solitary incisor in each half is small, and, instead of pro- 
truding horizontally, is nearly erect; the canines “are also 
almost erect, and less like incisors than is usual in the Sub- 
order. The pre-molars are sharp, but the anterior is smaller 
than the two posterior ; the anterior and median molars have 
four cusps, and are cingulate, while the posterior molar has 
five cusps. 
