272 The Life History of Amoebae 
these forms have left the cyst and are about to return to the motile 
stage. 
In the third case, an amoeba was found in the stools of^ European 
who had resided for some years in the Dutch Indies. This amoeba 
resembled the former one in all details. It was found in company 
with E. coli and Blastocystis hominis. No pathogenic action was 
observed. 
Conclusions. 
One of the amoebae herein described may be an ordinary limax 
form. The other is of the limax type but the cysts are different and 
by its physiological characters it is to be considered a true intestinal 
parasite. It is uncertain whether this amoeba is pathogenic or not. 
In the second case the intestinal complaint could only be ascribed to 
it, no other parasites being present, but in the third case the carrier 
of the parasite was perfectly healthy. The morphological features of 
the parasite permit of its being distinguished without difficulty from 
other intestinal parasites: the cysts and motile forms of Entamoeba coli 
and E. histolytica are larger; the 4-nucleate cysts of Chilomastix mesnili, 
although of the same size, show different nuclear (vesicular) structure. 
Blastocystis is often of the same size and its nucleus is of a similar 
structure, but its characteristic highly refractile character should 
prevent confusion. 
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