186 PARASITIC AMOEBAE OF MAN. 



production the collections of chromatin which form 

 the nuclei of the young amoebae may appear as round 

 or oval, highly refractile masses, within the endo- 

 plasm. 



As in other parasitic amoebae the endoplasm con- 

 tains bacteria of various kinds, crystals and 

 extraneous matter derived from the feces. 



Motility. What has been said regarding the 

 motility of Entamceba histolytica applies equally as 

 well to this species. The same forms of motility are 

 observed and I have not been able to detect any 

 difference in the rate of motility, both of these species 

 being very actively motile as compared with Enta- 

 moeba coll. 



The pseudopodia which are projected when the 

 organisms are in motion are composed entirely of 

 ectoplasm and are generally more or less finger-like 

 in shape, having blunt extremities. In this species 

 the pseudopodia are very clearly distinguished from 

 the rest of the organism and are clear and glass-like 

 in appearance. When the organisms are actively 

 motile the endoplasm very quickly flows into the 

 pseudopodia so that in some instances it is rather 

 difficult to distinguish the boundary line between 

 these two portions of the cytoplasm. 



Stained Preparations. This parasite may be 

 stained by any of the methods which have been recom- 



