buccal cavity 

 membranelle 



cytopharyngeal 

 rod 



undulating membrane ^•^i^^^*^?" 



mm 



cirrus 



►marginal cirri 

 mjdventral cirri 



transverse cirri 



somatic 

 cilium 



ciliary 

 ^ row 



stylus 



somatic cilium 



peniculus 



vestibulum 



Figrure 1. — Holosticha diademata, ventral aspect. 

 Figrure 2. — Uronema sp., oral aspect. 



Figure 3. — Dysteria sp., ventral aspect. Ciliary rows indicated by dash lines. 

 Figure 4. — Frontonia sp., oral aspect with reg-ion of buccal cavity enlarged in the dia- 

 gram to the right. 

 Figure 5. — Diagram of a ciliate with a lateral vestibulum. 



Simple cilium A cilium that emerges singly 



from the cell surface and is morphologically 



and functionally a unit. 

 Somatic cilia All kinds of simple and compound 



cilia of the general body surface, usually used 



in locomotion (see Fig. 2). 

 Stylus A posterior cirruslike extension of the 



cell surface in members of the Dysteriidae, 

 resembling the posterior projection of some 

 rotifers. It is a secretory organelle for tem- 

 porary attachment (see Fig. 3). 

 Thigmotactic Capable of crawling along sur- 

 faces, and resisting removal from such sur- 

 faces. 



