MAMMALIAN FAUNA IN NORTH AMERICA. 



587 



others) is traversed by triangular ridges admirably adapted to triturate 

 its coarse food. 



Megalonyx (big claw) (Fig. 957) is the name of another genus of 

 these gigantic sloths, and Mylodon of a third. Both of these genera 

 extended into North America. In fact, the Megalonyx was first dis- 

 covered in Greenbrier County, Virginia, and named Megalonyx by 

 Thomas Jefferson. The larger species of Mylodon and Megalonyx were 

 about the size of a buffalo, or larger. 



Fig. 958.— Skeleton of Mylodon robustus, Quaternary, South America. 



Of the Armadillos or mailed Edentates, there were several of gi- 

 gantic size belonging to the genera Glyjrtodon, Chlamydotherium, and 

 Pachytherium. The accompanying cut represents one of these eight 



Fig. 959. — Skeleton of Glyptodon clavipes, x -fa, Quaternary, South America. 



feet long, with an invulnerable coat of mail. Some species of the genus 

 Chlamydotherium were much larger — one as big as a rhinoceros, and 

 of Pachytherium as big as an ox (Dana). 



