TtUh 



isniHiini,.~, 16.Condvlosl-oma 



l8.Trachelius IftOphryoglena 



opsis 



FlG. 71. — Various forms of Ciliata. 9a shows part of a colony, 6 a single zooid, and 

 c a couple of nematocysts ; a. anus ; c. (in 18) cuticle ; c. (in 19) excretory canals ; c. vac. 

 contractile vacuole; /. vac. food vacuole; <j. gullet; mff. nu. meganucleus ; mi. nu. micro- 

 nucleus ; mth. mouth ; nu. nucleus ; ntc. nematocyst ; p. (in 15) a Paramecium seized by 

 Didimium ; t. tentacle ; u. mb. undulating membrane ; vac. non-contractile vacuole ; vst. 

 vestibule. (From Btttschli's Protozoa, after various authors.) 



