428 



PALEONTOLOGY. 



?), a large raised central circular plate is surrounded by 

 smaller portions. The species named G. reticulatus, G. tuber- 

 culatus, G. omatus, etc., have their names from other modi- 

 fications of the sculptured surface of their armour. Above 

 the principal figure in cut 169 are shewn the front and back 



Fig. 169. 

 Extinct gigantic Armadillo (Olyptodon clavipes). 



margins of the body-armour ; below it, opposite the left hand, 

 are upper and under views of the cranium, which was defended 

 by a tesselated bony casque. The tail also had its indepen- 

 dent osseous sheath, supported by the vertebrae within, as 

 shewn in the figure opposite the right hand. 



Toxodon* Macrauclunia^ and Protopithecus^ are additional 

 evidences of extinct South American Mammals, matched only 

 by species now peculiar to that continent. 



Australia in like manner yields evidence of an analogous 

 correspondence between its last extinct and its present abori- 

 ginal mammalian fauna, which is the more interesting on 

 account of the very peculiar organization of most of the 



* Owen, "Fossil Mammalia of the Voyage of the Beagle," 4to, 1839. 



f lb. I Lund. Annales des Sciences Nat., 2d series, torn, xiii., p. 313. 



