10 MAMMALIAN GALLERY. 



rhini, the anterior are longer than the posterior their 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) Tne 

 Yarkees 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 Monkeys by having 

 scarcely any tail ; one species (O. calva), exhibited in this Case, 

 is quite bald ; and all are very thinly haired, in marked contrast to 

 the Yarkees. (5) The Squirrel-Monkeys (Nyctipithecus, Callithrix, 

 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 partly 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 Platyrrhiui are the Hapalidae 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 f, 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 tropical 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 human 

 u 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." 



