CHAPTER VII 



The Amoebae (Continued) 



Endolimax nana. lodamoeha butschlii. Dienta- 

 moeba fragilis. Other Amoebae 



ENDOLIMAX (ENDAMOEBA) NANA 



This small amoeba was long confused with other 

 parasitic and free living forms. Although it is a 

 very common amoeba of man and had been observed 

 by several protozoologists before that time, it was 

 first described by Wenyon and O'Connor in 1917. 

 Its main interest lies in the fact of its commonness 

 and the liability of confusion with Endamoeba histo- 

 lytica. 



As it occurs in the stool it is inconspicuous in any 

 but very careful study. It is usually sluggish or 

 practically non-motile and its small size, 6 to 12 mi- 

 crons, allows it to be passed by under the eye of a 

 casual observer. When fresh and kept at body 

 temperature it is more active. The ectoplasm and 

 endoplasm are not sharply differentiated, the for- 

 mer sometimes showing as a clear hyaline rim in the 

 rounded resting stage. Pseudopodia are ordinarily 



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