ORDER, DISORDER; TORSION, DETORSION 55 



Foetfingcria lives in tlio gastrovasciilai' fluid of cooleii- 

 terates. The size of the trophont varies from 20 to (UK) /x. 

 Its structure shows nothing remarkable. 



If the trophont, whatever its size may be, is taken out of 



.■■qj2? 



Fig. 21. Foettingeria actiniarum: trophont. 



the Actinia, it encysts and undergoes a detorsion. Very 

 early, the kinetosomes of the row 1 produce by division a 

 field of granules w^hich is then oriented in one, and later on 

 in three, rows. A perfectly bipolar structure is produced. 

 Division starts and produces some thousands of tomites. 

 The formation of the tomite is somewhat more complicated 

 than in the other species. The rows x, y, z are reduced pro- 

 gressively to the size they will have in the trophont, but at 



