Ill 



the compressed form and excavated inner surface characteristic of that of 

 the Armadillos ; that a similar wide space separated it from the middle 

 part of the fibula ; and that the anterior margin of the bone was con- 

 tinued obliquely as a strong ridge to the inner angle of the distal surface. 

 The distal articular surface presents two concavities separated by a con- 

 vexity, the outer hollow being the largest and deepest ; the external 

 malleolus forms a strong process, as in the Armadillos ; at the back part 

 of the tibia we find also two well-marked tendinous grooves separated by 

 a projecting ridge. The corresponding part of the skeleton of the Me- 

 gatherium deviates widely in the proportions of the tibia and fibula, and 

 in the conformation of the distal articular surface from that of the 

 Glyptodon. Presented by Sir Woodbine Parish, K.H. 



The following fossil bones of the Glyptodon clavipes belong to the left hind- 

 foot, which was articulated with the preceding specimen, and formed part of the 

 skeleton of the same individual. 



525. The astragalus. This bone agrees with the astragalus of the Armadillos 



in the form of the upper articular surface, not having the internal protu- 

 berance, which, in the Megatherioids, projects into the characteristic ex- 

 cavation at the corresponding part of the tibial articulation. 



Presented by Sir Woodbine Parish, K. H. 



526. The calcaneum. This, though a strong bone, has the posterior prolonga- 



tion less remarkable for its length and strength than in the Megatherioid 

 quadrupeds : the articulation between it and the astragalus is divided into 

 two parts by a narrow rough groove : the cuboidal facet is distinct from 

 the astragalar ones. In these respects the Glyptodon agrees with the 

 existing Armadillos. Presented by Sir Woodbine Palish, K.H. 



b'27 ■ The os naviculare. The posterior surface of this bone presents an uni- 

 form concavity, by which it differs from that of the Megatherioids, and 

 resembles that of the recent Armadillos : the anterior surface presents 

 three distinct articulations for three cuneiform bones, whilst in the Me- 

 gatherioids there are but two such articulations. 



Presented by Sir Woodbine Parish, K. H. 



