HABITS.--This interesting animal, geographically so isolated, lives in the luxuriant forests in small companies, and feeds chiefly on the abundant fruits which these forests provide. In its {283}disposition it appears to be more amiable and docile than the African Baboons. Some kinds of Monkeys, as Mr. Darwin observes, which have moveable ears, and fight with their teeth, draw back their ears when irritated just like Dogs, and then they have a very spiteful appearance.... Other kinds--and this is a great anomaly in comparison with most other animals--retract their ears, "and utter a slight jabbering noise when they are pleased by being caressed. I observed this in the _Cynopithecus niger_.... With the _Cynopithecus_ 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 recognised 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 is 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." When enraged, the _Cynopithecus niger_ depresses the crest of hair on its forehead, and shows its teeth; "so that," as Mr. Darwin continues, "the movements of the features from anger are nearly the same as those from pleasure; and the two expressions can be distinguished only by those familiar with the animal." See the figures in Mr. Darwin's "Emotions in Man," &c., p. 136. {285}APPENDIX. While this volume was passing through the press, a valuable paper by Messrs. Oldfield Thomas and Ernst Hartert has appeared in the Hon. Walter Rothschild's Journal "Novitates Zoologicæ." It deals with the Mammalia collected in the Natuna Islands by Mr. Alfred Everett, and the following additional notes must be recorded. p. 20. TARSIUS TARSIUS. _Tarsius spectrum_, Oldfield Thomas and Hartert, Nov. Zool., i., p. 655 (1894). Mr. Everett says that on Banguran Island he could hear nothing of the existence of the Tarsier, but on Sirhassen Island the Malays described it to him unmistakably under the name of "Imbing." p. 33. NYCTICEBUS TARDIGRADUS. Mr. Everett procured specimens of the Javan Slow-Loris on the island of Banguran, where, he says, it is probably not rare, though not often captured; the native name is "Kukáng." The natives of Banguran did not appear to know the animal. p. 100 _et sequent._ PROPITHECUS MAJORI. _Propithecus majori_, Rothschild, Nov. Zool., i., p. 666, pi. xiv. (1894).