168 



REPRODUCTION 



develop male and female reproductive organs (testes and 

 ovaries) and they reproduce, in their turn, sexually. They 

 break off from the parent hydroid and swim away. The 



Fig. 58. Bougainvillea fmduosa, ma,gm^ed ahout 12. From Allman. ^. The 

 fixed hydroid form with numerous hydroid polyps which produce by budding 

 (asexually) the jelly-fishes or medusae. These are seen in various stages of 

 development. B. The free-swimming sexual medusa broken away from A, 

 will produce by ova and spermatozoa (sexually) the hydroid form. 



