326 ANIMALS OF EGA. Chap. V. 



furred and long-haired apes, apes with excessively long 

 tails, and apes with rudimentary tails. The second 

 American family, the Marmosets, have thirty -two teeth, 

 like the Old World monkeys and man ; but this identity 

 of number arises from one of the true molars being 

 absent ; the Marmosets have three premolar teeth, like 

 the Cebidse, and are therefore quite as far removed as 

 the Cebidae from all the forms of the Old World. They 

 are, moreover, a low type of apes, having a smooth 

 brain, and claws instead of nails, although they are 

 gentle and playful in disposition, and have a visage 

 which presents an open facial angle. 



The Old World apes, as just observed, are far more 

 diversified amongst themselves, than are those of the 

 New World. They form, in the first place, two widely 

 distinct groups or sub-orders, Pithecidse and Lemurs, 

 and comprise about 125 species, divided into twenty- 

 one genera. The Lemur group contains a remarkably 

 great diversity of forms ; this is shown by their being 

 naturally divisible into four families,* and twelve 

 genera, although containing only twenty-five species. 

 Their teeth are very irregular in number and position, 

 but never correspond with those of the Pithecidse or 

 Cebidse. These four families, in structure, are more 

 widely separated from each other than are the two 

 American groups of the same denomination. The 

 Lemurs also contain a number of anomalous or isolated 

 forms, which, by their teeth, number of teats, and other 

 features, connect the monkeys with other and lower 

 orders of the mammal class ; namely, the Rodents, the 



* True Lemurs, Tarsiens, Aye-Ayes, and Galeopitheci. 



