HOW TOIVIITE MANUFACTURES TRICHOCYSTS 21 



The study of other forms of apostomatous ciliates will re- 

 inforce these conclusions and provide more data about 

 kinetosomes. 



Phoront 



Tomite 



Protomite 



Grown-up 

 trophont 



Fig. 8. Polyspira delagei: life cycle. 



Polyspira delagei lives as a phoront together with Gym- 

 nodinioides on the skin of hermit crab ; it grows in the exo- 

 skeleton and behaves like Gymnodinioides (Fig. 8). But 

 there is no encystment of the growii-up trophont, which 



