THE SKIN AND SKELETON. 137 
bone; but in the development of the various parts, and 
especially of the appendages, there is endless variety. 
Fishes come nearest to the archetype skeleton ; but while 
they possess a complete set of skull-bones, they have no 
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representatives of fingers and toes. The Snake has plenty 
of ribs and tail, but no breast-bone; the Frog has a breast- 
bone, but neither tail nor ribs. As the skeleton of a Fish 
is too complicated for the primary student, we will select 
for illustration the skeleton of a Lion—the type of quad- 
