40 



MORPHOGENESIS IN CILIATES 



has to select a female before ecdysis. A delicate pinching of 

 the female limbs apparently enables him to recognize a 

 change of consistency of the tissues 24 to 48 hours before 

 the molt. He then climbs on the back of the female and 



Fig. 14. Synoplirya hijpertrophica. Last division of the hypertomont 

 and morphogenesis of the hypertomite with a trophontal structure. 



waits. If such a male-carrying female is sacrificed, one finds 

 that all the hypertrophonts are undergoing palintomy. 

 Division is induced by some changes which take place 48 

 to 24 hours before ecdysis. However, this hyperpalintomy 

 yields hundreds or thousands of ciliates with the typical 

 structure of the trophont. They will escape after ecdysis, 

 enter the molted exoskeleton, and behave as normal tro- 

 phonts. Here, as in Phoretophrya, the ciliates formed after 



