THE ANIMAL KINGDOM 29 



pelvic extremities are absent in the adult. There are two abdominal 

 teats. Teeth may be replaced by whalebone. 



Order 9. CmROPTERA. Chiroptera are the bats and flying foxes. 

 Their anterior Hmbs are modified as wings, the fingers are joined by a 

 web, and the sternum has a keel. 



Order id. primates. The primates include lemurs, marmosets, 

 monkeys, baboons, apes, and men. They are mostly arboreal in habit. 



YOUNG CHIMPANZEE 



Fig. '25. — Young Chimpanzee, a t>pe of Anthropoid (From photograph by Fred 



Johnson.) 



Nearly all have five digits with flattened nails, and in all except the lowest 

 forms the thumb is freely opposable to the fingers. Mammary glands 

 are usually a single pair and thoracic. 



Primates are divided into two sub-orders. 



Sub-order Lemuroidea. The lemuroids include the lemurs and 

 tarsiers. They are arboreal and nocturnal, small and not especially 

 monkey-like. T>^ical lemurs have a claw on the second digit of the 

 hind-foot. Thumb and great toe are not completely opposable to the 

 other digits. The uterus is two-horned. 



