20 MANUAL OF ZOOLOGY SECT. 



7. Insectivora, including the Moles, Shrews, and Hedge- 

 hogs. 



8. Chiroptera, or Bats, and Fruit-eating Bats ("Flying 

 Foxes.") 



9. Primates, comprising the Lemurs, Apes, and Monkeys, 

 and the Human Species. 



The two genera of the Prototheria, Ornithorhynchus and 

 Echidna, differ somewhat widely from one another in 



FIG. 289. Duck-Bill (Omithorkynchus anatinns). (After Vogt and Specht.) 



general appearance. The former (Fig. 289) has the surface 

 covered with a close, soft fur, and its upper jaw is pro- 

 duced into a depressed muzzle, not unlike the beak of a 

 duck, covered with a smooth, hairless integument. The 

 eyes are very small, and there is no auditory pinna. The 

 legs are short, and the five digits end in strong claws and 

 are connected together by a web, so that the limbs are 

 equally adapted for burrowing and for swimming. The 

 tail is elongated and depressed, and covered with fur. The 

 male has a sharp-pointed, curved spur on the inner side of 



