AMOEBA 



Classification : Phjdiim Protozoa, Class Rhizopoda, Order 

 Amoebina. 



There are numerous species which are commonly referred to 

 as the "amoebas" but not all of these belong to the genus 

 Amoeba in its technical or restricted sense. These differ from 

 one another in the form and number of pseudopodia and in finer 

 details such as size and structure of the nucleus in stained 

 preparation. The large species. Amoeba proteus, is most com- 

 monly used for laboratory study. 



If the same species is used throughout this study, care 

 should be exercised to avoid making broad generalizations. 

 Facts observed for one species are not always applicable for other 

 members of this genus. 



While many amoebae lead independent lives, utilizing mi- 

 croscopic plant and animal matter as food, others exist as para- 

 sites. Especially important are those which parasitize man. One 

 species (Endamoeha histolytica) is the cause of the amoebic 

 dysentery. 



1. Method of Examination : 1. Upon a clean glass slide 

 mount a small piece of the ooze containing Amoeba. Cover with 

 coverglass. Note appearance under low power. 



2. If a full answer cannot be given at once, make tem- 

 porary notes, reserving the final answer until all observations 

 are completed. 



3. From time to time, add a drop of water to the slide, at 

 the margin of the coverglass, to replace loss by evaporation, 



II. General Form. Is the form constant? Is there any 

 plane of symmetry? Anterior or posterior end? Is there a 

 characteristic form? Notes required. 



III. Structures and Functions. 1. Study under high 

 power. The outer clear or non-granular region is the ectoplasm. 

 Structure? What part does it play in the movements of the 

 animal ? 



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