_ C.1MIC 



l0idinium 



FIG. 19. Various forms of Ciliata. qa shows part of a colony, b a single zooid, and 

 C a couple of nematocysts; a, anus; c. vac, contractile vacuole; f. vac, food 

 vacuole; g, gullet; mg. mi, meganucleus; mi. nu, micronucleus; mth, mouth; 

 nu, nucleus; ntc, nematocyst; /.tentacle; . mb, undulating membrane; vac, 

 non-contractile vacuole; vst, vestibule. (From Biitschli's Protozoa^ after vari- 

 ous authors.) 



E 49 



