34 PARASITIC AMCEB^E OF MAN. 



differentiated the two amoebae now known as En- 

 tamceba coli and Entamceba histolytica, but unfortu- 

 nately they did not adopt the name Entamceba as a 

 generic term. 



In 1903, Schaudinn, following the work of 

 Jiirgens, definitely proved that two distinct species 

 of amoebae infested the intestine of man. His work 

 rested not only upon fiiff erences in the morphology 

 of the two parasites, but upon their entirely distinct 

 methods of reproduction, which he studied very thor- 

 oughly. To the amoeba occurring in the feces of 

 normal individuals, or in those suffering from other 

 diseases than dysentery, he gave the name Entamceba 

 coli, while to those occurring in dysenteric feces and 

 causing that disease, he gave the name Entamceba 

 histolytica. 



Stiles has written an exhaustive summary regard- 

 ing the nomenclature of the amoebae of man, in which 

 he clearly states the nomenclatural situation, and con- 

 cludes that for those who believe that there is but 

 one species of amoeba infecting man and that it is 

 not congeneric with fresh water amoebae, the correct 

 name to use is Entamceba coli,, not Amoeba coli,, for, 

 as shown by Casagrandi and Barbagallo, the amoebae 

 of the human intestine differ from the fresh water 

 amoebae, to which the generic term " Chaos," later 

 amended by Ehrenberg to " Amoeba," was originally 

 given; while for those who believe in a harmless and 



