68 THE DESEADO FORMATION OF PATAGONIA 
Fig. 33. Left side of pelvis—natural size. 
The pelvis is elongated, slender and lightly built, indicat- 
ing the same characteristics in the whole hind limb. The 
femur has a small rounded head on a well marked neck. It is 
excessively long, longer than that of Pachyrukhos, and also 
FN 
Fig. 35. Patella— 
natural size. 
Fig. 34. Left femur— Fig. 36. Tibia and fibula 
natural size. —natural size. 
