II SKELETONS OF BIRD AND REPTILE 27 
very little way forward and a long way backward, a 
slender bar of bone, united for part of its length with 
the Ischium. To discuss here whether this is all 
Fic. 8.—Left side of Pelvis (2) of Lizard ; (4) of Bird. 
A, acetabulum ; IL, ilium; 1s, ischium; pr, pubis; v, vertebra fused. 
In (a) the ischium and pubis slope inwards to meet their fellows from the opposite 
side. In (2) all three bones are fused where they meet. The ilium extends forwards 
as well as backwards from the acetabulum. 
Pubis proper, or whether a pubic “ process” has 
been added, would be out of place. The term 
process, meaning an out-growth, is a favourite one 
with anatomists, and is often useful as a name, 
though, it must be owned, it does not explain much. 
