RHIZOPODA 



423 



Endamoeba Dysenterise.— It is evident that the dysentery 

 ameba was observed by Loesch in 1875, but a clear distinction 

 between the harmless and the pathogenic forms of enteric amebae 



Fig. 182. — Endamcsba dysenterice. The same living individual drawn 4t brief inter- 

 vals while moving. (From Doflein' after Hartmann.) 



was not made until 1903. It is yet not certain whether one or 

 several species are included in the dysenteric amebae. The name, 



Fig. 183. — Endamoeba dysenteric, a. Vegetative cell containing a red blood cell 

 (near upper end). X1300. b and c. Drawings of nuclei showing stages of the so- 

 called cyclical changes. X2600. {From Doflein after Hartmann.) 



Endamceba dysenterice is synonymous with E. tetragena and E, 

 histolytica. The organism occurs in the intestine and in the stools ^ 

 of persons suffering from amebic dysentery and very seldom in 



