200 PARASITIC AMCEBJE OF MAN. 



In order to facilitate the diagnosis of the three 

 species under discussion I have prepared Table IV, 

 giving the chief differential points between them. 



ENTAMCEBA MI NUT A. Elmassian, 1909. 



Elmassian has described an amoeba in cases of 

 dysentery occurring in Paraguay which he considers 

 a new species and to which he has given the name 

 Entamceba minuta because of its small size, specimens 

 seldom exceeding 14 microns in diameter. 



GEOGRAPHICAL DISTRIBUTION. So far as is 

 known this species occurs only in South America, 

 and at the present writing has been described as 

 occurring in Paraguay, but will probably be found 

 distributed throughout South America, and the ad- 

 jacent islands. 



MORPHOLOGY. Entamceba minuta closely re- 

 sembles morphologically both Entamceba histolytica 

 and Entamceba tetragena, but is distinguished from 

 them by its small size. From Elmassian's descrip- 

 tion it would appear that this feature is of the greatest 

 importance in the differentiation of the species and 

 if his observations are confirmed the question of 

 the size of an amoeba, hitherto considered as of slight 

 specific importance, will prove to be, in this instance, 

 at least, a valuable distinguishing feature. The de- 

 scription which follows is compiled from Elmassian's 



