PLATE 2 



EXPLANATION OF FIGURES 



24 Trophozoite with one vegetative and four generative nuclei, the latter 

 associated in pairs to form the sporoblasts. Giemsa smear. 



25 Troi>hozoite containing one vegetative nucleus and two sporoblasts, one 

 with two, the other with three nuclei. Giemsa smear. 



26 Trophozoite in which the sporoblast has shrunken away from the surround- 

 ing endoplasm. Only two of the three nuclei of the sporoblast are in the section. 



27 Trophozoite showing one entire sporoblast composed of three cells-. Only 

 part of the other sporoblast occurs in the section. 



28 Trophozoite containing two sporoblasts, each with three nuclei but no 

 distinct cells could be made out. One vegetative nucleus present. All the 

 nuclei in the trophozoite are shown. 



29 Trophozoite with one four-celled and one three-celled sporoblast. Only 

 one vegetative nucleus present. 



30 Trophozoite in which the vegetative nucleus is dividing amitotically. 

 Only one sporoblast with five nuclei occurs in the section. 



31 Trophozoite with one three-celled and one five-celled sporoblast. Only 

 one vegetative nucleus present. 



32 Three-celled sporoblast drawn under a higher magnification. Note that 

 one cell is distinctly larger than the other two. X 2000. 



33 Three-celled sporoblast, in which the two smaller cells are dividing mitot- 

 ically. X 2000. 



34 Sporoljlast in which one of the smaller cells has just divided while the 

 other is in a late anaphase. X 2000. 



35 and 36 Five-celled sporoblasts formed by the division of the two smaller 

 cells of the three-celled sporoblasts. X 2000. 



37 and 38 Five-celled sporoblasts in which the large end cells are preparing 

 to divide amitotically. Note that in figure 38 the nucleolus shows a median 

 constriction and that in figure 37 there are two nucleoli. X 2000. 



ABBREVIATIONS 



cap.c, capsulogenous cell. par.c, parietal cell. 



gem... gemmule. sp.c, sporoplasm cell. 



g.c, generative cell. v.n., vegetative nucleus. 



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