6oo MAMMALS. 



very small. The marmosets often bear three young ones 

 at a birth, whereas the other monkeys usually bear but 

 one. There are two genera Hapale and Midas. 



Family 2. Cebidse ( = Platyrrhini). American Monkeys. 



In the American monkeys the nose is flat, with a broad 

 internarial septum. They occur throughout tropical America, 

 but are most at home in Brazil. All are arboreal, and many 

 have prehensile tails. The digits have nails, not claws ; the 

 thumb, though not opposable, is divergent from the fingers, 

 except in the spider-monkey — Ateles — in which it is rudi- 

 mentary. The skull is rounded, and the frontals form a 

 V-shaped suture with the parietals. The dentition is char- 

 acteristic, for there are six back teeth ; the formula being 

 2133- 



Examples :— The howling-monkeys (Mycetes), with large vocal 

 organs protected by the expanded mandibles, and with an 

 inflated hyoid bone forming a resonating chamber ; the sakis 

 (Pithecia) with very long tail ; Nyctipithecus ; Chrysothrix; 

 the spider-monkeys {Ateles) with exceedingly prehensile tail ; 

 the capuchins (Ceim), so often imported into Europe. 



Family 3. Cercopithecidse (^Cynomorph Catarrhini). 

 Old World dog-like Apes. 



The Old World apes of this family are still quadrupeds, 

 and the snout or muzzle often justifies the term Cynomorph 

 or dog-like. There is a narrow internarial septum, to which 

 the term Catarrhine refers. The dentition is like that of the 

 anthropoid apes and man, 2123. The external auditory 

 meatus is bony. The thumb is opposable, except when it 

 is rudimentary as in Colobus. The tail is not prehensile. 

 Over the rough surfaces of the everted ischia the skin forms 

 callosities often brightly coloured. The breast-bone is 

 narrow. The caecum has no vermiform appendix. 



In the sub-family CercopithecinK, there are cheek -pouches, the 

 stomach is simple, the fore- and hind-limbs are almost equal. 



Examples : — the African baboons (Cynocephalus) e.g., the mandrill 

 ( C. maimon) notable for the bright colours of the face and hips 

 in the adult males . the macaques {Ma'cacus) all Asiatic except 



