﻿600 
  

  

  GEORGE 
  WAGNKU. 
  

  

  Pig. 
  3. 
  — 
  Common 
  method 
  of 
  travel 
  in 
  Hydra. 
  A. 
  Body 
  bending 
  

   toward 
  substratum. 
  B. 
  Tentacles 
  attaciiiug 
  themselves. 
  C. 
  Foot 
  

   loosened 
  and 
  body 
  contracted. 
  D, 
  Body 
  re-extended, 
  foot 
  end 
  

   beginning 
  to 
  bend 
  over, 
  E. 
  Foot 
  attaching 
  itself 
  near 
  hypostome. 
  

   F. 
  Upright 
  position 
  regained. 
  

  

  