xiii PHYLUM CHORDATA 465 



The former (Fig. 1042) has the surface covered with a close, soft 

 fur, and has the upper jaw produced into a depressed muzzle, 

 not unlike the beak of a duck, covered with a smooth, hairless 



FIG. 1042. Duck-Bill (Ornithorhynchus anatinus). (After Vogt and Specht.) 



integument, which forms a free fold or flap at the base. 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 con- 

 nected together by a web, so that the limbs are equally adapted 

 for burrowing and for swimming. The tail is elongated and 



FIG. 1043. Spiny Ant-Eater (Echidna aculeata). (After Vogt and Specht.) 



depressed, and is covered with fur. The male has a sharp-pointed, 

 curved spur on the inner side of the foot, having the duct of 

 a poison-gland opening at its apex. Echidna (Fig. 1043) has 

 the body covered above with strong pointed spines, between 

 which are coarse hairs; the lower surface is covered with hair 



VOL. II H H 



