520 RALLUS. RAIL. 



by no precise line, for the principal distinction between these 

 genera lies merely in the length of the bill, which in the former 

 is longer than the head, and in the latter shorter. The Galli- 

 nules in like manner pass into the genus Porphyrio, and the 

 latter into Fulica. 



Only one species of Rail occurs in Britain. 



