rni: ORir.iN of \ f.r n:r.R.\ iti> animals [S3 



confined to the Australian region and America ; the 

 kangaroo and opossum are examples of this group. 

 (3) Placenta! inauunals, such as the horse, doer, lion, 

 whale, hat, and monkey. 



JNIoxotremata.— These are in many respects the 

 most primitive, and it is therefore well to concentrate 

 our attention on them. 



FV,. •- 



4?M 



The Oniithorlivnchus (Fig. ;,_A is one of the most 

 r< markable of animals, and was first described by 

 Shaw in 1 700. The animal is from 1 S to 20 inches in 

 length, and is covered with short soft hairs. It has 

 a horny beak, something like that of a duck, and 

 possesses teeth when young, although these are 

 lost in the adult state. It has small eyes, and no 

 external ears. The limbs are short and strong, and 



