15 Didlnium 



w \ij IS.Trachelius IS.Ophryoglenc 



16, Condyle-stoma ' 



I70palinopsls 



Fig iq. ^Various forms of Ciliata. qa shows part of a colony, b a single zooid, and 

 C a couple of nernatocysts; a, anus; c. vac, contractile vacuole: /. vac, tooa 

 vacuole' g gullet; mg. nil, meganucleus ; mi. nu, micronucleus; »/M, mouth; 

 «u nucleus- ntc, nematocyst; /, tentacle; a. w4, undulating membrane; tw, 

 non-contractile vacuole; -list, vestibule. (From BUtschli's Protozoa, after vari- 

 ous authors.) 



F 49 



