10 
MAMMALIAN GALLERY. 
rhini, the anterior are longer than the posterior — tlieir rudimentary 
thumbs^ and long prehensile tails. (2) The Howling Monkeys 
{Mycetes, Case 7), the males of which possess a most extra- 
ordinary voice, the resonance of which is increased by a peculiar 
chamber formed by the middle portion of the bone of the tongue 
(see p. 70) : they are stout, thick-set animals, with well-developed 
thumbs, prehensile tails, and are generally of a uniform red, brown, 
or blackish colour; the males are furnished with short thick 
beards. (3) The Negro-Monkeys [Lagothrix, Case 8). (4) The 
Yarhees and Uakaris {Pithecia and Ouakaria), two closely allied 
genera, the first with peculiarly long thick hair all over its body 
and tail, which latter, though long, is not prehensile ; the second 
distinguished from all the other American ^lonkeys by having 
scarcely any tail ; one species (0. exhibited in this Case, 
is quite bald; and all are very thinly haired, in marked contrast to 
the Yarkees. (5) The Squirrel-Monkeys [Nyctipithecus, CaUithrix, 
and Chrysothrix, Case 9) are all beautiful little creatures, with 
soft bright-coloured fur, long, hairy, non-prehensile tails, and 
well-developed thumbs; they live ])artly on insects. (6) The 
[Case 9 ] Sapajous, or Capuchin Monkeys [Cebus, Case 9), are a genus of 
numerous dull-coloured species, with thick prehensile tails and 
well-developed thumbs. Being comparatively hardy and easily 
tamed, trained specimens are frequently exhibited in this country. 
The second family of the Platyrrhini are the HapaVidm or .Mar- 
mosets, differing from the others by their non-opposable pollex *, 
which is provided with a claw instead of a nail, their rudimentary 
hallux t; long, hairy, and never prehensile tail, and the different 
number of their teeth. They are small animals, some not exceed- 
ing a rat in size, and of bright and varied appearance, many being 
ornamented with long tufts of hair on their ears, and all being 
more or less brightly coloured. They are almost entirely con- 
fined to the forests of tro])ical South America, a single species 
only extending as far north as Panama. 
The second Suborder of the Primates — the Lemuroidea — 
consists of a number of very remarkable animals, of a far lower type 
* The first or innermost digit of the fore limb, corresponding to the Immau 
thumb,” a name inapplicable when it is not opposable to the other digits, 
t The first digit of the hind limb, corresponding to our “ great toe.” 
