PLATE VI 



CILIATE INFUSORIA 



FIGURE 9a. A large reddish brown animal, common in all the lakes. It is covered 

 all over with short cilia, which appear to continue beneath the surface as short 

 rods, making a thick skin. A bundle of pbaryngeal rods forms a kind of narrow 

 cage, tapering downwards, as in Nassula, &c. 



FIGURE 96. Probably the same animal as Fig. 9a, at a different stage in its life- 

 history. The cage of pharyngeal rods is of the same form, and projects far above 

 the surface. The skin is thin, and not ciliated. Many of these colourless 

 examples were found at the same time. 



FIGURE 10. A narrow curved animal, narrowing to one end. It is marked longitu- 

 dinally with faint ridges, which are seen in profile to be finely undulate. It is 

 ciliated on all the ridges, the cilia being long and not very close together. 

 They gradually elongate to the broad end. All are motile but only those on a 

 limited area move actively. No mouth could be detected. 



FIGURE 11. A ciliate with projecting crest ; no other details noted. 



FIGURE 12. Ciliate with a beak, a series of strong cilia at the mouth, and another 

 series round half the circumference of the body. 



FIGURE 13. Large oval ciliate, ciliated all over, and with a vibrating membrane 

 occupying an elliptical area. The cilia appear to be continued under the skin 

 as rods (as in the species figured in 9a). 



FIGURE 14. A dark brown ciliate, with cilia all over the body. It is elliptical in 

 form, with the poles produced into rounded processes. No mouth or other 

 organs could be seen. As it travels along in the direction of its long axis it 

 at the same time revolves round it. 



FIGURE 15. An oval ciliate, marked with longitudinal ridges. There are four 

 strong setse at each end, a row of motile setae half-way down one side, and 

 a single seta on the same side. 



