PLATE 19 

 Free and precystic phases of Councilmatiia lafleuri 



Fig. 5. Free amoeba with food vacuole containing remnant of red blood 

 corpuscles, nucleus with a thin zone of peripheral chromatin and central, sphe- 

 roidal karyosome with halo. Three pseudopodia in retraction, one at the right 

 forming. 



Fig. 6. Precystic stage with some food contents, including a cyst of Chilo- 

 mastix davainei, in vacuoles. Halo about the nucleus, heavier zone of peripheral 

 chromatin, very e.xcentrie karyosome with halo, intermediate zone with devel- 

 oping chromatin net, no ectoplasm differentiated. 



Fig. 7. Precystic stage with no food contents, enlarged nucleus in premi- 

 totic phase with no peripheral chromatin zone, but with vague, destained merid- 

 ional strands, karyosome slightly excentric, dispersed in a ring of granules, no 

 well defined halo. 



Fig. 8. Binueleate free amoeba with no vacuoles, and single, large pseudo- 

 podium. Nuclei with thin zone of peripheral chromatin and central, dispersed 

 karyosome suggesting recent or coming mitosis. 



Fig. 9. Eounded-up free amoeba crowded with food vacuoles containing red 

 blood corpuscles, and bacteria, nucleus with thin zone of peripheral chromatin, 

 slightly excentric karyosome with excentric halo. 



[192] 



