56 
NATURAL HISTORY. [NEW BUILDING. 
cartilage at the part beneath the tip. Of these the 
Atelina have very slender bodies and long limbs, like 
the Long-armed Apes; some have no thumb on the fore 
hand, as the Spider Monkeys, Ateles and Brachyteles; 
and others, as the Negro Monkeys (Lagothri: r), have a 
distinct thumb. They are slow, mild, and gregarious, 
eating insects and fruits. (Cases 22—24.) 
The other American Monkeys with prehensile tails 
(Mycetina ) have a very large tumid cellular Adam’s 
Apple, (or larynx,) and are called howlers, from the con¬ 
tinual loud noise they make in the woods, especially at 
night. They live on leaves, and are as slow and more 
melancholy in appearance than the Spider Monkey, as 
the genus Mycetes . (Cases 25, 26.) 
The remainder of the American Monkeys have their 
tail entirely covered with hair. 
Some of these, as the Cebi , have nevertheless the 
faculty of curling their tail, and using it to assist them in 
climbing. They live on fruits and insects, are lively and 
gregarious, and are playful when young. 
The tail of the other kinds is not curled. Some 
of these have a slender tufted tail, as the Callithrix, 
which are diurnal, lively, with a moderately sized face 
and orbits, and the Nyctopitheci , which are nocturnal, 
with a very small face and large orbits, like an owl’s. 
The Pithecice (Cases 27 — 28) are diurnal, but have a 
thick hairy tail, which is nearly as long as the body, 
and they are often furnished with a dense beard; the 
Brachyuri only differ from them in having a shorter tail. 
The Iacchi (Case SO) are very like the former, but 
they have only five grinders on each side of each jaw. 
They are small, lively, and live on insects; some have 
a ringed tail, and a tuft of long hair on the side of the 
ears; others, as the species of Midas , have a uniformly 
coloured tail and no ear-tufts, but are often furnished 
with an elongated mane. 
Thefamily of Lemurs ( Lemuridce , Cases 81—33) are 
much more quadruped-like in their form than the Mon¬ 
keys ; their lower cutting teeth are produced and slanting ; 
and the fore fingers of their hinder hands are armed with 
an elevated pointed claw. They eat fruits and insects, and 
