354 Pleistophora gigantea, Tlielolian 
After the encystment the trophozoites become rounded and are 
no longer in so close contact with each other as they were before 
(Diagram VII b, c, Diagram VIII). Consequently, the individuals do 
no longer fill the whole lumen of the cyst; between them larger and 
smaller interstices are left. 
This change is caused by the reduction of the protoplasmatic 
substance in the trophozoites, whereas the amount of nuclear sub¬ 
stance is increased. This becomes evident when comparing some of 
the trophozoites figured in Diagram VIII containing 5-11 nuclei, 
with the larger trophozoites shown in Diagram III, which contain 
an equal or smaller number of nuclei. 
Diagram IX. (Magnification of Diagram II.) Part of the cyst shown in Diagram VIII 
under a higher power, a. Pansporoblast with nuclear division leading to the formation 
of pairs of nuclei. b. Pansporoblast with nuclei arranged in pairs. c. Dividing 
pansporoblast with two pairs of nuclei. 
Diagi-am X. (Magnification of Diagram III.) a. Pansporoblast producing a sporoblast by 
unequal division. b. Pansporoblast producing sporoblast by equal division. 
Diagram XI. (Magnification of Diagram I.) Small cysts with few sporoblasts. 
