PLATE XV. 



All figures three-eighths natural size. 



Aphelops fossiger. 



Figs. I, 2, and 3. Portions of left femur. 



Fig. 4. Left patella. Posterior aspect. 



Fig. 5. Left tibia. 



Fig. 6. Left fibula. 



Figs. 7 and 8. Right astragali. 



Procamelus major. 

 Fig. 9. Left radius and ulna. Distal extremity. 



Procamehis medius. 

 Fig. 10. Left radius and ulna. Distal extremity. 



