



Figure 5 



This drawing, which was made from a culture in the Osborn Zoological 

 Laboratory, Yale University, shows many Brown Hydra (Pelmatohydra) living 

 under normal conditions. They are attached to water plants or other con- 

 venient objects at almost every angle. Continual movement is noted. The 

 animals, searching for prey, extend their tentacles to great lengths and then 

 contract them, and the entire body also is contracted or expanded as the condi- 

 tions happen to require. 



59 



