34 ZOOLOGICAL GARDENS. 
wont to treat the still greater Naturalist of the North, 
seems to have been so little known to Button, that the 
latter, setting aside the positive assertion of Marcgrave, 
whom alone he quotes, maintains that the Exquima 
must have been one of the prehensile-tailed Monkeys 
of the Western world. From this strange assertion, to 
which he was probably induced by the figure of one of 
these being erroneously introduced in the text in place 
of that of the African Monkey which was given on 
another page, and from his making no further mention 
of the animal, it appears that he had never seen a 
specimen. Allamand, however, in the Dutch edition of 
Bufton’s Natural History, gave an excellent account of 
two living individuals which had fallen under his notice 
at Amsterdam, which he imagined to belong to a new 
species, and to which he first assigned the name of the 
Palatine, on account of the peculiar ruff of the fore part 
of the neck, but changed it afterwards for that of Rolo- 
way, by which he was informed that it was called in 
Guinea, from whence his specimens were brought. By 
this latter title it was received into the posthumous 
Supplement to Buffon published by Lacépéde; and 
Gmelin, Pennant, and other compilers have adopted 
it as forming a distinct species from the Diana; a 
distinction altogether without a difference. We cannot, 
however, agree with M. Fréderic Cuvier in considering 
the Monkey figured by him, under the name of Diana, 
in the splendid Histoire Naturelle des Mammiferes, as 
belonging to this species, of which it has none of the 
characteristic marks. It appears to us to be entirely 
new; but at the same time to be much more closely 
allied to Cercopithecus Mona than to the subject of 
the present article. 
The animal before us clearly belongs to that exten- 
sive croup of Monkeys of the Old World with long 
