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THE AMEBIC AN NATURALIST [Vol. XLIV 



and of Uromastrix (Figs. 5-8). Compare these for a 

 moment with the pelves of the huge sauropod reptiles 

 and you see immediately that there is an enormous dif- 



ference in general, and in countless details, which it is 

 not worth while to consume your time in describing. 

 Taking up now the articulation of the femur with the 



acetabulum of the pelvis, we discover in the first place 

 that the head of the femur in the lacertilia differs re- 

 markably from the head of the femur in the sauropoda. 



