226 PARASITIC AMOEBJS OF MAN. 



cytoplasmic body, the Nebenkorper of Schaudinn. 

 The nucleus is spherical in shape, and has a delicate 

 refractile nuclear membrane. The cytoplasmic body 

 lies in contact with the nucleus, measures about 2 

 microns in diameter, and is somewhat refractile. In 

 rare instances the cytoplasm may contain one or two 

 red blood corpuscles, so that it is evident that phago- 

 cytosis of these cells is not confined to the amoebic 

 stage of development. 



Reproduction by longitudinal division may some- 

 times be observed. When this is occurring the 

 organisms present two nuclei and at certain stages 

 one can observe the partial division of the flagellum 

 into two portions, the splitting of the flagellum being 

 first noticeable at its point of attachment to the body 

 of the parasite. That these forms are not conjugat- 

 ing organisms is proved by the fact that the division 

 of the nucleus may be observed before there is any 

 division of the flagellum, the parasite at this stage 

 showing two nuclei and but one flagellum. It is 

 probable that the division of the nucleus is preceded 

 by the division of the cytoplasmic body, but I have 

 not been able to satisfy myself that this is so. After 

 the division of the nucleus is complete, the cytoplasm, 

 as well as the flagellum, divides longitudinally, thus 

 forming two parasites. 



After reproduction in this manner has occurred 



