PARASITIC AMOEBAE OF MAN. 



regarding experiments upon animals with this species 

 of amoeba. He believes that it is the cause of a mild 

 form of dysentery in Japan and bases his belief upon 

 the occurrence of the organism in the feces of pa- 

 tients suffering from this type of the disease. 



As regards the validity of this species it must 

 be admitted that at this time the data are hardly 

 sufficient to definitely prove that the parasite de- 

 scribed by Koidzumi is a distinct species. Its re- 

 semblance, according to his description, to both 

 Entamoeba histolytica and Entamoeba tetragena, 

 leaves one in doubt as to whether he may not have 

 mistaken certain stages of the development of either 

 of these parasites for a new species. 



.ENTAMCEBA TROPICALIS. Lesage, 1908. 



From his observations Lesage has concluded that 

 the harmless amoeba found in healthy individuals and 

 in those suffering from diseases other than dysentery 

 in the Tropics, belongs to a distinct species, and to 

 this parasite he has given the name Entamoeba 

 tropicaUs. 



The species resembles Entamoeba coli in general 

 appearance. It has a distinct nucleus, which contains 

 much chromatin, and reproduces by simple division 

 and by the development of daughter amoeba? within a 

 cyst. It differs from Entamoeba coli in having a 



