Branch Protozoa ii 



II. — Watch the motion of the cilia on the surface of the 

 body, and see the effect produced by such motion. If 

 the Stylonychia forces itself along among the particles 

 on the slide, notice the flexibihty of the body. 



III. — Find two or three groups of spine-like processes much 

 larger than the cilia. Are they movable ? See if you 

 can determine their use. 



IV. — Find the gullet, appearing as a light streak near the 

 centre of the .body. Notice the motion within the gul- 

 let. Trace the buccal-groove from the gullet to the end 

 of the body. Observe the enlarged cilia along it. Ob- 

 serve the relation between the buccal-groove and the 

 direction in which the creature moves. 



V. — Run a little powdered carmine under the cover glass. 



Wait a little until it reaches the Stylonychia ; then see 

 if you can observe the passage of some of the particles 

 into the body. By patient watching, the course of the 

 food masses through the body may be traced, the pro- 

 cess being similar to that already seen in the Paramecium. 



VI. — The indigestible particles are forced out through the 

 ectosarc near the posterior end. Find if you can a 

 mass of particles to be egested; observe intently the 

 surface near the base of the spines, and quick, jerky 

 twitchings of the protoplasm will be seen ; this forces 

 out the particles. 



VII. — Observe the contractile vacuole and the two large 

 nuclei ; to see the latter, it may be necessary to use a 

 staining solution. 



VIII. — Draw a Stylonychia, showing the structural char- 

 acters you have seen. Make the sketch at least an 

 inch long. 



