AMCEByE OF THE INTESTINAL TRACT. 213 



distinct ectoplasm and by the fact that it can be cul- 

 tivated in symbiosis with bacteria of various kinds. 

 The cysts are smaller than those of Entamoeba coli 

 and instead of eight daughter amoebae being formed 

 within the cyst this species produces from three to 

 as many as thirteen daughter amoebae. 



Lesage believes that this is the species which has 

 been cultivated by Musgrave and Clegg, and that the 

 production of dysentery in animals with such cultures, 

 as reported by the latter observers, was due to con- 

 tamination with the spores of Entamoeba histotytica. 



According to Lesage, Entamoeba tropicalis is not 

 pathogenic for animals. 



I have not been able to confirm the observations 

 of Lesage regarding the existence of a distinct species 

 of harmless amoeba in the tropical regions in which 

 I have studied this subject, and I believe it very 

 doubtful if this species is valid. 



ENTAMCEBA PHAGOCYTOIDES. Gauducheau, 1908. 



This species was described by Gauducheau, who 

 found it in the feces of a case of dysentery occurring 

 in Indo- China. Its characteristic features are its 

 small size, from two to fifteen microns in diameter; 

 the presence of a well marked ectoplasm; and the 

 fact that it can be easily cultivated on ordinary agar- 

 agar in symbiosis with bacteria. The author gives 



