With the Cynopithecus
(fig. 17), the corners of the mouth are at the same time
drawn backwards and upwards, so that the teeth are exposed.
Hence this expression would never be recognized by a stranger as one
of pleasure. The crest of long hairs on the forehead is depressed,
and apparently the whole skin of the head drawn backwards.
The eyebrows are thus raised a little, and the eyes assume a
staring appearance. The lower eyelids also become slightly wrinkled;
but this wrinkling is not conspicuous, owing to the permanent
transverse furrows on the face.
_Painful emotions and sensations_.--With monkeys the expression of
slight pain, or of any painful emotion, such as grief, vexation, jealousy,
&c., is not easily distinguished from that of moderate anger;
and these states of mind readily and quickly pass into each other.
Grief, however, with some species is certainly exhibited by weeping.
A woman, who sold a monkey to the Zoological Society, believed to have
come from Borneo (_Macacus maurus_ or _M. inornatus_ of Gray), said
that it often cried; and Mr. Bartlett, as well as the keeper Mr. Sutton,
have repeatedly seen it, when grieved, or even when much pitied,
weeping so copiously that the tears rolled down its cheeks.
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