THE BLACK SEILER MONKEY . 
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covering. It is larger than the Coaita, and is black, and covered with long hair, but the face is brown. 
The tail is considerably longer than the body. 
THE BLACK SPIDER MONKEY. 
This Spider Monkey is more interesting for its geographical range and favourite localities than for 
anything else. It lives in Central America, north of Panama, and is common in the neighbourhood of 
the volcano called Orizaba, in the state of Vera Cruz. It lives in companies in the deep barrancas, up 
to an elevation of two thousand feet above 
the sea, and in the State of Oaxaca it roams 
in the forests up the country to a height of 
four thousand feet, being the same elevation 
to which the Tapir often reaches in its 
roaming. It is a black Ateles, with very 
long hail', which spreads out in all direc- 
tions, but there is grey- white on the inside 
of the limbs, and underneath. It has no 
thumbs on the hands. 
The position which the Ateles take in 
resting is often very curious. The great 
Apes of the Old World can lie on their 
backs like a man, and the Monkeys with 
callosities sit on them, and, drawing up the 
knees, let the head fall on to them, or on to 
the breast, bringing the arms forward when 
they sleep. But the want of callosities, 
and of the peculiar flatness of back which 
characterises the Anthroponiorpha, prevents 
the American Monkeys from adopting 
either of these positions. Many lie on their 
sides, and others huddle up in parties, but 
the Ateles often lie across two or three rope- 
like horizontal stems, with the face looking 
downwards, a turn being taken by the tail 
round the support to insure safety. The 
length of the back has something to do with 
this, and of course with their extraordinary 
agility. The dorsal region of the back-bone, 
or that which bears ribs, is as long in corn- 
regions as in any Monkey ; indeed, the 
maximum of length is attained. There are 
either thirteen or fourteen back-bone pieces 
(vertebrae), which have ribs attached to them. The lower vertebrae are four or five in number, and 
the tail is at its maximum of length in relation to that of the body, its pieces (caudal vertebrae) 
being very complicated near its root. There, eight pieces (vertebrae) are so like those of the back 
that they have spines, cross processes, of course without ribs, jointing processes, and a similar nervous 
canal to those which are higher up in the body. The spinal marrow does not go down it, however. 
Underneath them are the V-shaped or chevron bones. The end bones are short and thick. 
THE VARIEGATED SPIDER MONKEY. * 
These Monkeys appear to go in small parties, passing through the forests at a rapid pace, feeding 
on different kinds of berries. The berries which Mr. Bartlett found in their stomachs resembled a 
* Ateles variegatm. 
parison with the other (neck and loin) 
