THE GROWTH OF JELLY-FISHES. 



745 



Turritopsis, the jelly-fish, which is infested by the Ciiiiina lar- 

 vae, has a life-history which is very similar to the one given in 

 this diagram, with the addition of a slight but highly important 

 modification. * 



Fig. 15.— TuERiTOPSis. 



The planula is shown in the left-hand lower corner of Fig. 2. It 

 soon attaches itself to some solid body and becomes a root, which 

 goes no further, but, as shown in the right-hand lower corner of 

 Fig. 2, soon produces a bud which becomes a feeding hydra. Mul- 

 tiplication by budding now goes on rapidly, in such a way as to 



