HOLOTRICHA 



505 





Fig. 232. Ichtkyophthirius multifiliis. a, free-swimming individual, 

 X75 (Blitschli); b-e, development within cyst; f, a young individual, 

 X400 (Fouquet); g, section through a fin of infected carp showing 

 numerous parasites, XlO (Kudo); h, a catfish, Ameiurus albidus, 

 heavily infected by the ciliate (Stiles). 



but without caudal cilia; cytostome with flaps which beat 

 alternately; ciliation uniform. 



S. viride K. (Fig. 233, c). Spherical or oval; always with green 

 food vacuoles containing Euglena and allied flagellates; cytostome 

 at anterior end; cytopharynx with trichocysts, which are ex- 

 tensible at the time when food is taken in; cilia on about 20 rows, 

 near cytostome somewhat longer; macronucleus round; body 

 50-75^t long; sapropelic. 



