638 



TROE. H. G. SBELEY ON 



[Aug. 1900, 



tibia. The exposed condylar surfaces of the distal eud are rounded 

 from above downward. The lower half of the shaft is longitudinally 

 channelled in front by a deep groove, which stops short abruptly 

 above the distal extremity, and appears to penetrate into the bone 



Fig. 6. — Right hind-limb of Aristodcsmus Riitimeyeri. 

 (Nat. size.) 



] lium. 



Femur. 



between the condyles in a foramen, in the way seen in the femur 

 of Propappus and Pareiasaunts. There is some approach to this 

 channelling of the distal articulation of the femur in Iguanodon 

 and some Ornithischian reptiles ; but I have not observed it in any 



