PROTOZOANS 109 



nent ? How is the mouth closed ? Compare with the amceba 

 in this respect. 



Find the esophagus and anal opening. Are the positions 

 of the two constant? 



Does the animal appear to have a nervous system? Does 

 it seem to perform actions of its own accord? Does it 

 seem to be irritated when other objects come around it? 

 Do the cilia on the different sides coordinate in movement? 

 Has the slipper animalcule the sense of touch and of taste? 



Make a large drawing of the Paramecium showing and 

 naming the parts studied. 



Note. — If amoebae cannot be found, the white blood corpuscle of 

 the frog or of any mammal may be used, as they have all the com- 

 mon characteristics of amoebae. 



(4) The Vorticella: It is likely that some of the slides 

 prepared will show this simple form of life. It may be 

 readily distinguished by the fact that it is bell-shaped in 

 form and has a stem by which it is generally attached to 

 leaves or sticks in the water. Examine under microscope. 

 Note its shape and length and compare it with Amoeba and 

 Paramecium. Do you find the ectosarc, endosarc, nucleus, 

 and vacuole as in the Paramecium? Study the base by 

 which the animal is attached. How is it attached? Re- 

 move one with a needle. Is it difificult to remove? Do you 

 think it could remove itself and attach itself ? Why ? Does 

 it grow singly or in colonies? Study the stem. Does it 

 seem to have the same structure as the body ? Does the body 

 have the power of movement ? Look at the size of the heads. 

 Do you find any in the process of division ? Do you find a 

 mouth? Where? Of what use are the cilia? Reproduc- 

 tion may take place by simple fission as in the Amoeba, and 



