280 



VERTEBKATA 



groups. The sea lions resemble the seals, but have no 

 external ears and no hair or claws on the front flippers. 

 The neck of the sea lion is much longer than that of the seal. 

 Sealskin fur is not derived from a seal, but from the sea 

 lion (Callolaria ursina), breeding only in the region of the 

 Behring Sea, although making circuits in winter as far 

 south as San Francisco. 

 Primates. This order includes the lemurs, monkeys, 



FIG. 317. Skull of man on the right and young chimpanzee on the left. Photograph. 



and man, all of which have hands and handlike feet, and 

 in most cases the thumb is opposable to the fingers, so as 

 to grasp a limb. The lemurs of Madagascar are the lowest 

 Primates, and with the exception of their grasping hands 

 and feet resemble externally some of the Carnivora. The 

 common black and white lemur is about as large as a cat. 

 About twenty species of monkeys of a low order extending 

 from Mexico to Brazil are included in one family, the 

 marmosets. They are all small, but few being larger than 

 squirrels, and are characterized by toes with pointed claws, 



