XIII 



PHYLUM CHORDATA 



493 



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 



FIG. 1105. Duck -Bill (Ornithorhynchusunatinus). .(After Vogt and Specht.) 



a gland opening at its apex. Echidna (Fig. 1106) has the body 

 covered above with strong, pointed spines, between which are coarse 

 hairs ; the lower surface is covered with hair only. The jaws are 

 produced into a rostrum, which is much narrower than that of 

 Ornithorhynchus. The eyes are small, and there is no auditory 

 pinna. The limbs are short and powerful. There are five toes 

 on each foot, each ending in a very strong claw, by means of which 



Fir;. HOG. -Spiny Ant-Eater (Echidna aculeaia). (After Vogt and Specht.) 



the Echidna is able to burrow with rapidity. There is a spur on 

 the inner side of the hind foot, larger in the male than in the 

 female. The tail is vestigial. 



