404 



SPECIFIC MICRO-ORGANISMS 



Entamceba Tetragena. Viereck in 1906 recognized this 

 organism as a species distinct from E. coli. It occurs in the intes- 

 tine and in the stools of persons suffering from amebic dysentery 



FIG. 174. Entamosba telragena. The same living individual drawn at brief intervals 

 while moving. (From Doflein after Hartmann.) 



and very seldom in other individuals. The cell is 8 to 6o/i in 

 diameter. The ectoplasm is distinctly differentiated from the 



FIG. 175. Eutamceba telragena. a, Vegetative cell containing a red blood cell 

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

 called cyclical changes. X26oo. (From Doflein after Hartman.} 



endoplasm even when the cell is motionless, and the lobose pseudo- 

 podia are made up entirely of the stiff highly refractive ectoplasm. 

 The endoplasm contains food material consisting of bacteria, cell 



