PLATE 20 

 Eneystment in Councilmania lafleuri 



Fig. 10. Eounded-up free amoeba with ectoplasmic zone sharply set off from 

 the vacuolated endoplasm. Nucleus with nearly uniform zone of peripheral 

 chromatin, subeentral, spherical karyosome with narrow excentric halo. 



Fig. 11. Very small uninucleate cyst with large central glycogen vacuole 

 crowding the nucleus to the wall. Nucleus with neither peripheral zone nor 

 karyosomes, its chromatin scattered in peripheral nodes with connecting strands, 

 some of them double, a few vague chromatoidal masses in the cytoplasm, cyst 

 wall present. 



Fig. 12. Binucleate cyst with central glycogen vacuole, two nuclei in the 

 peripheral cytoplasm nearing the prophase of mitosis, scattered flakes of chro- 

 matoidal substance in the cytoplasm, thick cyst wall present. 



Fig. 13. Binucleate cyst with nuclei in early anaphase, each with sixteen 

 chromosomes in the equatorial region and deeply stained polar masses (centro- 

 somes) with traces of an intradesmose on the nuclear wall connecting them, 

 small chromatoidal bodies in the cytoplasm. 



Fig. 14. Quadrinucleate cyst, with cytoplasm encroaching upon the central 

 glycogen vacuole, nuclei showing two conjoined polar masses (centrosomes) 

 connected by strands with about eight chromatin masses on the nuclear mem- 

 brane, no chromatoidal bodies, cytoplasm chromophile. 



Fig. 15. Eight-nucleate, thick-walled cyst with a narrow chromophile ridge 

 almost encircling the body, scattered chromatoidal threads traversing the cyto- 

 plasm, and a chromophile mass near the middle of the ridge. Nuclei with no 

 peripheral chromatin, clear intermediate zone and central karyosome of dis- 

 persed granules. 



Fig. 16. Eleven-nucleate cyst with central chromatoidal fascicle viewed from 

 the end, several chromatoidal needles. Nuclei generally with subeentral dis- 

 persed karyosomes, and peripheral chromatin masses in some of the nuclei. 



[194 J 



