326 
ANIMALS OF EGA. 
Chap. Y. 
furred and long-haired apes, apes with excessively long 
tails, and apes with rudimentary tails. The second 
American family, the Marmosets, have thirty -two teeth, 
like the Old World monkeys and man ; but this identity 
of number arises from one of the true molars being 
absent ; the Marmosets have three premolar teeth, like 
the Cebidse, and are therefore quite as far removed as 
the Cebidse from all the forms of the Old World. They 
are, moreover, a low type of apes, having a smooth 
brain, and claws instead of nails, although they are 
gentle and playful in disposition, and have a visage 
which presents an open facial angle. 
The Old World apes, as just observed, are far more 
diversified amongst themselves, than are those of the 
New World. They form, in the first place, two widely 
distinct groups or sub-orders, Pithecidae and Lemurs, 
and comprise about 125 species, divided into twenty- 
one genera. The Lemur group contains a remarkably 
great diversity of forms ; this is shown by their being 
naturally divisible into four families,* and twelve 
genera, although containing only twenty-five species. 
Their teeth are very irregular in number and position, 
but never correspond with those of the Pithecidse or 
Cebidag. These four families, in structure, are more 
widely separated from each other than are the two 
American groups of the same denomination. The 
Lemurs also contain a number of anomalous or isolated 
forms, which, by their teeth, number of teats, and other 
features, connect the monkeys with other and lower 
orders of the mammal class ; namely, the Rodents, the 
* True Lemurs, Tarsiens, Aye-Ayes, and Galeopitheci. 
