106 ON THE UAKAEI MONKEYS. 



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 com- 

 parison 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 Geoff roy'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 

 P. Z. S. 1880, the tail having apparently shrunk much after the removal of the bones 

 p. 028. inside. Other specimens in the Paris Museum, Mr. Blanford informs 

 me, have tails of about the same length as ours, while they closely 

 correspond in other respects, the amount of grey on the crown of the 

 head varying in different specimens. 



The accompanying plate (Plate IV.), taken from a sketch made by 

 Mr. Wolf shortly after the animal's arrival, will give a more correct 

 impression of this Monkey than the figures hitherto published of it. 



The weight of our specimen, considerably emaciated, was 2 Ib. 11 oz. 

 The following measurements were taken on the body before being skinned 

 or otherwise interfered with : 



Total length (measured in a straight line from super- i nc h eg 



ciliary ridges, over head and body, to tip of tail) . . 21 



Length of tail, including hairs 6'5 



Fleshy part of tail 5-65 



Length of head, from occipital prominence to glabellum 2-65 

 From occiput to anterior margin of upper lip, in a 



straight line 3'65 



Breadth of face (just above the eyes, from outer margin 



of orbits) 2-0 



Breadth of nasal septum O75 



Breadth of mouth v . . 1*2 



Length of arm 5'5 



Length of forearm 5-0 



Length (extreme) of manus : 3*5 



Length of thigh 6-5 



Length of leg 5-75 



Length (extreme) of pes (plantar surface) 5-25 



* Arch. d. Mus. v. pi. 30. 



