CHAPTER XI 



CHROMIDIA AND NUCLEI OF A PROTOZOON 



AMONG the vegetable protists noticed above the chytridian 

 Polyphagus euglenae ; olpidians, such as Rozella septigena ; 

 and synchytrian? present features similar to some found in 

 rhizopods and sporozoa. 



Facts stated above indicate that Plassomyxineae are 

 closely related to Synchytriaceae, and hence they too must 

 be considered as belonging to the vegetable protists. Myce- 

 tozoa have so many rhizopod features that their animal 

 predominate slightly over their vegetable characteristics. 

 In the present Chapter is given a brief account of chromidial 

 and nuclear features of a definitely animal protist, one of 

 the shelled amoebas. The shelled amoebas have no patho- 

 genic members. Matters relating to amoebas parasitic in 

 man have been defined by Dobell (1919) ; Entamoeba 

 histolytica, the cause of amoebic dysentery has no connection 

 with any free-living organism. It was discovered by Loesch 

 in 1875, and named by him Amoeba coli, under which name 

 it is described and illustrated in Part I. It has not been 

 cultivated on artificial media. Extranuclear chromatic 



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