HOLOTRICHA 



795 



Fig. 339. a, a newly excysted trophont of Hyalospira caridinae, X1000 

 (Miyashita); b-e, Cryptocaryum halosydnae (Faur6-Fremiet and Mugard) 

 (b, the infraciliature of trophont, X450; c, tomont of third or fourth gen- 

 eration; d, anterior end view; e, tomite in life, X800). 



the anterior region strongly thygmotactic. When freed in the sea 

 water, no encystment occurs, but division into eight to 16 sub- 

 spherical individuals in chain, takes place. Tomont 45^ long; to- 

 mites 20m by 16/x, asymmetrical, with a long caudal bristle. 



References 



Chatton, E. and Lwoff, A.: (1935) Les cilies apostomes. Arch- 



zool. exper. gen., 77:1. 

 Faure-Fremiet, E. and Mugard, Helene: (1949) Un infusoire 



apostome parasite d'un polychete: etc. C. R. Acad. Sc, 228: 



1753. 

 Miyashita, Y. : (1933) Studies on a freshwater foettingeriid ciliate, 



Hyalospira caridinae. Japan J. Zool., 4:439. 



