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University of California Publications in Zoology [Vol.20 



Figs. 1-5. Councihnania lafleuri Kofoid and Swezy (1921). X 2500. From 

 camera lueida drawings of amoebae from smears of human faeces fixed in hot 

 Schaudinn's fluid and stained in iron haematoxylin. 



Fig. 1. Motile amoeba showing hyaline pseudopodium, sharp demarcation of 

 ectoplasm and endoplasm and nucleus with central, massed karyosome, with ragged 

 outline indicating massing of granules; clear zone, spoke radii, and peripheral 

 chromatin. 



Fig. 2. Binucleate cyst with subcentral empty glycogen vacuole, with adjacent 

 accessory vacuoles and flakes of ehromatoidal substance developing on the peri- 

 phery of the vacuoles. The two nuclei are in the early anaphase with polar centro- 

 somes, joined by a meridional intradesmose. Eight pairs of chromosomes are in 

 transit toward the poles of the spindle. 



