596 



EDENTATES 



xxii. 5 





Fig. 373. Giant South American edentates of the Pleistocene. Megatherium, the 



giant ground sloth, was the size of a modern elephant. The glyptodonts were 



related to the armadillos. (From a mural by C. R. Knight.) 



Fig. 374. Great ant-eater, Myr?necophaga, from life. 



Fig. 375. Lesser ant-eater, Tamandua. (From photographs.) 



Fig. 376. Tree ant-eater, Cyclopes, showing one of the 



peculiar attitudes adopted, perhaps to startle an attacker 



(dymantic posture). (From a photograph.) 



spreading northwards in the United States with the destruction of its 

 carnivore enemies by man. The haemochorial placenta, at first diffuse 

 then discoidal, is modified as a result of the process of polyembryony. 

 After cleavage the embryo divides into eight or twelve secondary 

 embryos, all developing within a single amnion. 



