38 MORPHOGENESIS IN CILIATES 



Just as those of Gymnodinioides, trophonts of Sijnophrya 

 take up food in the discarded exoskeleton. They abandon 

 the molt, encyst, and divide, and tomites are differentiated 

 which encyst on the integument of the crabs. But the 



Discarded 



Nebalia 



Nebalia 



Typical Cycle 



Atypical Cycle 



Fig 12 I'horetophrva nebdiae: life cycle. Normal cycle on the left. 

 On the right, formation of the huge apotomite which will encyst on 

 a Nebalia and in which division is induced by the pre-ecdysic phe- 

 nomena. The phoretotomite has a trophontal structure. 



