PLATE XV. 



LEFT FEMUR OF TRICERATOPS PRORSUS MARSH. 



(See p. 62.) 

 Plate prepared under the direction of Marsh. 



Specimen No. 4842, U. S. National Museum. 

 Fig. 1. External view. 

 Fig. 2. Internal view. 

 Fig. 3. Section of shaft. 



One-fourth natural size. 



228 



