Il SKELETONS OF BIRD AND REPTILE 13 
The Breastbone and the Bones that meet at the shoulder- 
Jornt. ; 
A powerful wing would be of no use without 
powerful machinery for moving it, and a lizard with 
a bird’s wings would be no more able to fly than any 
Fic. 5.—(z) Sternum of Iguana, wali tnterctawicle, coracoid, precoracoid, and 
. clavicle. 
cL, clavicle ; co, coracoid ; 1cL, interclavicle ; pco, precoracoid ; st, sternum; 
(8) Coracoid, scapula, and clavicle of fowl. 
co, coracoid ; sc, scapula; cL, clavicle. 
ordinary lizard. In the bird’s skeleton the enormous 
breastbone suggests a great deal. They must be 
strong muscles which have so strong and big a bone 
to which to attach themselves. No two things can 
be more unlike than the breastbones of the bird and 
the lizard, and the same may be said of the associated 
bones. In the lizard the whole apparatus is flat and 
