SKELETON 51 



heliiiid the junction tliere are only two little vertel)ra3 

 to repiTHent the tail hones. Note also that the for- 

 ward end of this hony rod (called the urostyle) has on 

 each side a projection against which the bones to which 

 the legs are fastened join directly. This really makes 

 throo stilT I'ods side l>v side in the hack here to I'esist 



the sudden thrust of the powerful hind legs. Many 

 creatures leap, hut none have themselves hurled for- 

 ward by a stroke directly at the rear end of the spinal 

 column, as the frogs. These projecting pieces at the 

 forward end of the rod are called " the transverse 

 processes of the sacral vertebras," and may or may 

 not be more or less expanded at their outer ends, 



