THE TAIL 



backward the arches and processes gradually disappear, and the bodies 

 become compressed and elevated vertically. At a point corresponding 

 to the posterior part of the peduncle there is an abrupt change in the 

 character of the vertebrae, and thereafter those which in life were sit- 

 uated within the confines of the flukes become smaller and broader, the 

 column ending in a series of vertebrae that are no more than bony but- 

 tons. To the vertebrae of the flukes pass bundles of large tendons, both 

 from the apaxial mass above, and the hypaxial musculature below. 



[205} 



