HOLOTRICHA 



631 



Genus Spirophrya Chatton and Lwoff. Trophonts ovoid, pointed 

 anteriorly; 16 uninterrupted ciliary rows of which striae 1 and 2 ap- 

 proach each other in posterior-dorsal region; phoronts attached to a 



Phoront 



(Idyaea furcata) ^f. 



Young trophont 



Fig. 296. Diagram illustrating the life-cycle of Spirophrya 

 subparasitica (Chatton and Lwoff). 



crustacean; when eaten by Cladonema, trophonts enter the crusta- 

 cean body and complete growth; protomonts upon leaving the host 

 body encyst and each divides into 4-82 tomites (Fig. 296). One 

 species. 



