440 Vniversity of California Publications in Zoology [Vol. 20 



Figs. 8-13. Councilmania muris (Grassi, 1881) Kessel, emend. 1923. X 2500. 

 Camera lueida drawings of amoebae from smears of rat faeces fixed in hot 

 Sehaudinn's fluid and stained in iron haematoxylin. 



Fig. 8. Motile amoeba showing hyaline pseudopodium and posterior tooth-like 

 projection. Note the marked differentiation between endoplasm and ectoplasm. 

 Nucleus showing karyosome of dispersed chromatin granules, and thin nuclear 

 membrane with no encrusted chromatin. 



Fig. 9. Mononucleate cyst, showing glycogen mass surrounded by small 

 chromatoidal bodies. Nucleus with thin membrane and dispersed granules in a 

 darkly staining region. Two of the granules are connected by an intradesmose. 



Fig. 10. Binucleate cyst showing glycogen mass in center and chromatoidal 

 body at edge. Nuclei in anaphase, showing spindle and six chromosomes. 



