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Show 1880.] MR. W. A. FORBES ON THE UAKARI MONKEYS. 627 In an apparently somewhat younger specimen the same faint brownish tint appears on the under tail-coverts. In the same specimen the pale rufescent margins of the wing-coverts and lesser remiges are more distinct. Feet very slender. 7. On the External Characters and Anatomy of the Red Uakari Monkey (Brachyurus rubicundus); with Remarks on the other Species of that Genus. By W . A. F O R B E S , B.A., F.L.S., Fellow of St. John's College, Cambridge, Prosector to the Society. [Received November 30, 1880.] (Plates LXI.-LXIII.) On May 24th, 1879, the Society purchased a female specimen of a red-haired short-tailed American Monkey, which on its arrival was somewhat doubtfully entered as an example oi Brachyurus rubicundus of Isidore Geoffroy '. This animal lived in fair health till April 22nd last, when it died without any premonitory symptoms. On dissection, both lungs and liver, so frequently the seat of disease in Monkeys kept in captivity, were found to be perfectly healthy : indeed, with the exception of a little inflammation of the stomach and small intestines, and a slight intussusception of the transverse colon, no morbid appearances whatever were found. The death of this animal has enabled me to give that further notice of it promised on its arrival (vide Mr. Sclater's monthly report, infra cit.), as well as to give some notes on its anatomy. For though, as might.have been expected, Brachyurus differs in no essential respect from its allies, the great rarity of Monkeys of this genus in captivity makes it advisable to record any facts concerning the anatomy of its soft parts. In particular, the brain of this genus of Monkeys being hitherto unknown, the description of it will fill up one of the few gaps till now left in our knowledge of this organ amongst the Primates. Our specimen of Brachyurus was a female, not yet adult, though perhaps nearly full-grown. All the teeth are in place, but the canines, both above and below, have not yet finished cutting, and the epiphyses of the bones are still unanchylosed. As regards the name of our animal, I may at once state that, Mr. Blanford having been kind enough to take the skin to Paris for comparison with the types of Brachyurus rubicundus in the gallery of the Jardin des Plantes, no doubt remains that it really belongs to that species. The specimen from which Isidore Geoffroy's figure 2 was taken is still extant in Paris; and the apparent shortness of its tail, reproduced in the figure, is due in all probability to the " make " of the skin, the skin of the tail having apparently shrunk 1 P. Z. S. 1879, p. 551. 2 Arch. d. Mus. v. pl. 30, |