A MANUAL OF ZOOLOGY B 



are found? Make a, careful drawing to illustrate all the 

 structures of the amoeba. 



PHYSIOLOGY — ^Describe the movements of the ani- 

 mal. Does the body change in shape as the animal pro- 

 ceeds? How does the movement seem to be brought 

 about? How are the pseudopodia formed? Note the 

 method of taking food. If your specimen is not taking food 

 add a little ground carmine to the water under the cover. 

 The animal will take this as food. What would be the natur- 

 al food of the animal? The activities of the animal must 

 necessarily produce waste matter. Are there any organs 

 of excretion?" Has your specimen cast off any waste mat- 

 ter at any time during your study? Remove the cover or 

 mount a new specimen without a cover. While looking at 

 the specimen touch it with a bristle or tap the slide. What 

 effect does it have? Warm the slide to 45 degrees C. 

 Note the effect. Touch the slide with a glass rod heated 

 and note the effect. The amoeba reproduces by, the simple 

 method of fission. Some one in the class may be fortunate 

 enough to find a specimen in the act .of dividing. If so the 

 attention of the whole class should be called to this 

 specimen. Is there any way of knowing which is the 

 parent in this simple method of reproduction? 



II INFUSORIA 

 ( 1. Paramoeclum 



ANATOMY — Compare this form with the amoeba as 

 to shape and activity. What is the shape of this animal?^ 

 Is it constant? If it changes compare with the change in 

 the amoeba."*^ iltf^e any way of determining an anterior 

 and a posterior end? How does the paramoeclum compare 

 in size with the amoeba? Can you account in any way 

 for its permanency in shape? Is there a cell wall? Does 

 it extend over the entire surface? Is there an ectosarc, an 

 endosarc, a contractile vacuole, or a nucleus? Compare 

 in each ca'se with the amoeba. In the paramoeclum two 

 nuclei may be found: a large one, macronucleus; and a 

 small one near the large one, micronucleus. Look for cilia. 

 Are they all over the body? Are they all alike? Kill 

 a specimen with 1 per cent osmic acid. Study the cilia. 

 Look for a row of striations under the cuticle, trichocysts. 

 What is the position and shape of the mouth? la it con- 



