PROTOZOA. 



11 



5. Can they distinguish their food ? 



6. What is the probable use of the pulsating vacuoles ? 



7. Is there any evidence that Paramoecia can breathe ? 



8. What is the advantage to the animal of so much 



moving about ? 



J. Points difficult to make out. 



1. The fine vibratory hairlike structures (cilia) by 



means of which the animal moves. (Use h.p., 

 turn the rotary disk to shut off most of the 

 light and look sharply at the edge of an animal 

 that has been " cornered.") 



2. The larger cilia lining the gullet. Their movement 



directs the food particles floating in the water into 

 the gullet. 



3. The radiating canals which appear like the spokes 



of a wheel when the pulsating vacuole disappears. 

 (They are best seen after the animal has been quiet 

 awhile or has been " cornered.") 



3. A COMPARATIVE STUDY OF PROTOZOA. 



Prepare a table similar to the one indicated below. 

 Place the name of the animal studied at the head of the 

 column and fill in your answers below these headings. 

 Draw a horizontal line across the page after each question 

 to separate it from the one following. Use the two left- 

 hand columns for the topics, printed in blackfaced type, 

 and the number of the question. 



