. 198. Photograph of a Hydra reproducing ; a,young bud about six hours old ; 

 6, bud four days old ; c, base fixed to a stem. Enlarged thirty diameters. 



FIG. 199. Several hydroid colonies each containing from 10 to 20 animals, growing 

 on a piece of rotten wood in the ocean. The three lowest animals on the tafl 

 colony in the middle are reproductive polyps. Photograph enlarged four 

 diameters.. (171) 



