1880.] MR. W. A. FOUBES ON THE UAKARI MONKEYS. 627 



In an apparently somewhat j^ounger specimen the same faint 

 brownish tint appears on the under tail-coverts. In the same speci- 

 men the pale rufescent margins of the wing-coverts and lesser 

 remiges are more distinct. Feet very slender. 



7. On the External Cliaractcrs and Anatomy of the Red 

 Uakari ]\Ionkey {Brachyums rubicundm) ; with Remarks 

 on the other Species of that Genus. By W. A. Forbes, 

 B.A., F.L.S., Fellow of St. John's College, Cambridge, 

 Prosector to the Society. 



[Eeoeiyecl Norember 30, 1880.] 

 (Plates LXI.-LXIII.) 



On May 24th, 187!), the Society purchased a female specimen of a 

 red-haired short-tailed American JVIonkey, wliich on its arrival was 

 somewhat doubtfully entered as an example oi Brachyums 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, Brachyiirus differs in lio 

 essential respect from its allies, the great rarity of Monkeys of this 

 genus in captivity makes it advisal)le 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 unauchyloscd. 



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 - 

 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. 187?, p. 551. 2 Avcb. d. Mus. v. pi. 30. 



