EAGLES AND HAWKS. 47 



The number of vertebrae in six species of this family 

 is as follows : 



The posterior dorsal vertebrae are sometimes, but 

 rarely, anchylosed. It will be understood that I do 

 not allude to the lumbar and sacral, which with the pel- 

 vic bones form a large continuous mass, so that their 

 number can be determined only by counting the fora- 

 mina. 



