55 
MAMMALIA ROOM.] NATURAL HISTORY. 
(P. nemceus ,) was formerly erroneously considered to be 
destitute of callosities, and was therefore formed into a 
genus under the names of Pygathrix and Lasiopyga. 
The Monkeys ( Cercopiihecina , Cases 12—17) have 
nearly the same form as the former, but their body is 
stronger, their limbs are shorter, and their face is rather 
more produced. They are playful when young, but be¬ 
come ferocious as they grow old. The Thumbless Mon¬ 
keys ( Colobu-s ) have no thumb on the fore hand ; they 
are confined to Africa. The Colobus Guereza is peculiar 
for having the hairs on the upper part of the back much 
elongated, so as to fringe the sides of the body: the 
skin of this animal is used by the Abyssinians to form 
shields. The other genera have a distinct thumb to 
both the fore and hind hands. Some, as the Cercopitheci , 
have only four tubercles to the hinder grinder on each 
side of the lower jaw : they are found both in Africa and 
Asia. Others, as the Mangabeys ( Cercocebus ) of Africa, 
and the Bonnet Apes ( Macacus ) of Asia, have five tu¬ 
bercles on the lower hinder grinders, and rather produced 
shelving faces, with the nostrils in the middle of the face; 
the Cercocebi have elongated hairy tails; the Macaci 
have shorter tails, and their eye-brows very prominent. 
One, theMagot (Inuus), has only a very rudimentary tail. 
The Baboons or Dog-faced Apes ( Cynocephalina , 
Cases IS—21) are so called because their noses are pro¬ 
duced and cut off at the end like a dog’s. They have five 
tubercles to their lower hinder grinders, and are confined 
to Africa. Some have cylindrical tails, tufted at the end, 
as the Cynocephali . The Maimons have a very short tail, 
as the Mandril and the Dril; the former is peculiar for 
having the nose of the adult animals brightly coloured. 
The family of American Monkeys ( Cehidce , Cases 
22—SO) differ from the Monkeys of the Old World, in 
their nostrils being wide apart, and as it were opened on 
the sides of the nose ; they have no cheek pouches, they 
never have any callosities on the rump, and their tails, 
which are usually long and strong, are often prehensile, 
and used as a fifth hand, to assist them in climbing. 
They mostly have six grinders on each side of each jaw. 
Some have a truly prehensile tail, having a naked 
