The Edentata of North America. 
These huge beasts were all vegetable feeders, living on the 
foliage of the trees which they uprooted, or whose branches they 
could reach. They are of late arrival in North America, and 
two genera, Megatherium and Mylodon, are each represented 
by species which persisted to or even into the period of human 
occupation. 
In the Myrmecophagidae, the terrestrial habit has been retained, 
but the disuse of the teeth, following the habit of swallowing 
ants whole in saliva, has resulted in their loss. Corresponding 
habits and loss of teeth are seen in the Old World Manidae. No 
extinct species are known. 
The ancestors of the Glyptodontidae from the Miocene of the 
Parana, like those of the Megatheriidai from the same region, 
possess narrow bands of enamel on the teeth. This discovery, 
made by Ameghino, confirms the anticipation expressed by 
