572 ZOOLOGY. 
the cloaca, asin birds. The sternum articulateswith a free cora- 
coid, and an inter-clavicle and epicoracoid bone are present. 
Fig. 498.—Spiny Ant-eater (Echidna hystrix).—From Brehm’s Thierleben. 
The brain differs from that of the members of the higher sub- 
classes.* Echidna lays large eggs, 2 cm. long, placing them 
* The hind skull is- intermediate between that of Amphibians and 
higher mammals. (Parker.) 
