no 



is divided by an oblique groove into two parts, and in some species of 

 Armadillo this groove is represented by an entering notch. 



Presented by Sir Woodbine Parish, K.H. 



520. The metacarpal bone of the second digit of the left fore-foot of the Glyp- 



todon clavipes. Presented by Sir Woodbine Parish, K.H. 



521. The distal phalanx of the second digit of the left fore-foot of the same 



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



522. The distal phalanx of the third digit of the left fore-foot of the same 



animal. 



In both these phalanges the proximal extremity offers a double shallow 

 articular pulley ; it is placed obliquely, so that the end of the bone 

 must have been inclined somewhat downwards. The upper and outer 

 margin is produced ; the bone is thicker on the inner than the outer 

 side, towards which it is slightly bent ; the upper surface is evenly con- 

 vex, but pitted with numerous vascular impressions, which are strongest 

 at the margin ; the under surface of the phalanx presents at its posterior 

 half a rough convex protuberance. 



Presented by Sir Woodbine Parish, K.H. 



523. The shaft and distal epiphysis of the femur of the Glyptodon clavipes. 



It is flattened from before backwards, but in a less degree than in the 

 Mylodon, being more constricted laterally in the middle of the bone ; 

 above this part on the outer side there is a large projection which 

 appears to have formed the third trochanter as in the Armadillos. The 

 rotular articular surface is distinct from the internal condyle, the outer 

 condyle is broken away. Presented by Sir Woodbine Parish, K.H. 



b2\. The anchylosed distal extremities of the tibia and fibula of the left hind- 

 foot of the Glyptodon clavipes. 



The Mylodon, Megalonyx and Scelidotherium differ from the Glyp- 

 todon and the existing Armadillos in having the two bones of the leg 

 distinct from each other ; but the Megatherium resembles the Glyptodon 

 in their anchylosis. Sufficient of the tibia remains to show that it had 



