The examples of our third class--of peculiar genera having little or no affinity with those of the adjacent islands--are almost entirely confined to Celebes, and render that island a district _per se_, in the highest degree interesting. _Cynopithecus_, a genus of Baboons, the extraordinary Babirusa and the singular ruminant _Ansa depressicornis_ have nothing in common with Asiatic mammals, but seem more allied to those of Africa. A quadrumanous animal of the same genus (perhaps identical) occurs in the little island of Batchian, which forms the extreme eastern limit of the highest order of mammalia. An allied species is also said to exist in the Philippines. Now this occurrence of quadrumana in the Australian region proves nothing whatever as regards a transition to the western islands, which, among their numerous monkeys and apes, have nothing at all resembling them. The species of Celebes and Batchian have the high superorbital ridge, the long nasal bone, the dog-like figure, the minute erect tail, the predaceous habits and the fearless disposition of the true Baboons, and find their allies nowhere nearer than in tropical Africa. The _Anoa_ seems also to point towards the same region, so rich in varied forms of Antelopes. In the class of birds, Celebes possesses a peculiar genus of Parrots (_Prioniturus_), said to occur also in the Philippines; _Meropogon_, intermediate between an Indian and an African form of Bee-eaters; and the anomalous _Scissirostrum_, which Prince Bonaparte places next to a Madagascar bird, and forms a distinct subfamily for the reception of the two. Celebes also contains a species of _Coracias_, which is here quite out of its normal area, the genus being otherwise confined to Africa and continental India, not occurring in any other part of the Archipelago. The Celebes bird is placed, in Bonaparte's 'Conspectus,' between two African species, to which therefore I presume it is more nearly allied than to those of India. Having just received Mr. Smith's Catalogue of the Hymenoptera collected during my first residence in Celebes, I find in it some facts of an equally singular nature. Of 103 species, only 16 are known to inhabit any of the western islands of the Archipelago, while 18 are identical with species of continental India, China, and the Philippine Islands, two are stated to be identical with insects hitherto known only from tropical Africa, and another is said to be most closely allied to one from the Cape.