UNICELLULAR ANIMALS 



PHYLUM PROTOZOA 

 I Rhizopoda 

 1. Amoeba 

 ANATOMY— The amoeba is so transparent that it Is 

 difficult to find without a great deal of care and some 

 experience in the use of the microscope. - After a good 

 specimen is found note size, shape, and structure. Can It 

 be seen without the aid of a microscope? Examine other 

 specimens and compare as to size. What is the shape? 

 Note any change in form that may occur. If there are 

 any projections they will be called p^eudopodia. Is the 

 number of pseudopodia constant? Are they In the same 

 position at till times? What is the meaning of the term 

 pseudopodium? Sketchi the animal in five different posi- 

 tions. Is there any difference in appearance in any part 

 of the animal that would seem to indicate a differentiation 

 In strueture? If so an outer clear area Will be seen, the 

 ectosarc. Is this seen all over the body? Why? The 

 Inner granular portion Is Known as the endotarc. How 

 does the quantity of this compare with that of the ectos- 

 arc? Is the endosarc uniform throughout? Do the gran- 

 ules always occupy the same position? A denser portion,^ 

 the nucleus, will be seen in the endosarc. What is' its size, 

 shape, and position? Are these all constant? Do they 

 vary in different specimens? If the nucleus is not visible 

 run a drop of dilute iodine under the cover. What effect 

 does this have upon the entire Animal? If iodine has beea 

 used the slide must be carefully cleaned and a new speci- 

 men found for the completion of the work. Look for clear 

 areas in the endosarc. If one is found that varies regularly 

 In size It will be called the contractile vacuole. How many 



