Objects of natural history are frequently brought in a great variety by the proas from the different islands of the Eastern Archipelago. Prepared birds of paradise, and living Loris, pink cockatoos, and occasionally the magnificent, Crowned or Dampier’s pigeons, as well as Rhinoceros birds, may be often purchased. An orang-utan was lately brought from Borneo to Singapore, by a commander of a vessel, who sold it for seventy-five dollars. During a visit to Singapore, in 1830, I procured, through the kindness of E. Boustead, Esq., a male specimen of the Ungka ape, (_Hylobates syndactyla_.) The animal had been recently brought by a Malay lad, in a proa, from the Menangkabau country, in the interior of Sumatra. The Malays at Singapore always called the creature Ungka; but I observe, in the Linnean Transactions, it is called by Sir Stamford Raffles, Siamang, and the Ungka is therein described as a different animal; the same as that under the name of Onko, in the splendid work on the Mammalia, (vols. v. and vi.) by F. Cuvier. The natives, however, at Singapore denied this being the Siamang, at the same time stating that the Siamang resembled it in form, but differed in having the eyebrows and hair around the face of a white colour. The _Hylobates syndactyla_ is described and figured also in Dr. Horsfield’s Zoology of Java, but the engraving does not give a correct idea of the animal, nor have I as yet seen one that does. Three beautiful drawings were taken for me, from the specimen I possessed, after its death, in different positions; and having preserved the skeleton in the skin, its general appearance was more natural than stuffed specimens usually are; they were executed by the able pencil of Charles Landseer, Esq. On board the ship Sophia, during the passage to England, ample opportunities were afforded me to study this singularly interesting little animal. Its measurement was as follows:—From the os calcis to the vertex of the head, two feet four inches; span of the arms, four feet; length of the arm, from the axilla to the termination of the fore-finger, one foot ten and a half inches; length of the leg, from the groin to the os calcis, eleven inches; length from the xiphoid or ensiform cartilage to the crest of the pubis, seven and a half inches.