47 173

Chap. IV

instance the Inuus ecaudatus, apparently do not thus act. Again other kinds, and this is a great anomaly in comparison with the expressions of most other animals, when pleased by being caressed draw back retract their ears backwards show their teeth, & jabber, when they are pleased by being caressed. I observed this in two or three species of Macacus, and carefully in the Cynopithecus niger. This latter monkey when pleased retracts the corners of its mouth and utters a jabbering noise, the teeth being thus exposed. At the same time the central crest of long hairs on the forehead is depressed and the ears are drawn flat back against the sides of the head. Brow expression, owing to our fal familiarity with dogs, this would never be recognised by those unacquainted with monkeys as one expression in the Cynopithecus and in the above species of Macacus, is never recognised as one of joy or pleasure. by a stranger not familiar with these animals. Judging from external appearances, the muscles which draw backwards and upwards the corners of the mouth and the skin of the forehead between the ears, seem as if in some manner physically connected with those which draw backwards the ears but whether any anatomical grounds exist for this conjecture I do not know.