404 



THE PROTOZOA 



FIG. 167. Spore-formation in Sphceromyxa sdbrazeai. A, Propagative cell with 

 two nuclei of different sizes ; B, two such propagative cells undergoing fusion 

 to form C, a pansporo blast with four nuclei, two smaller, peripheral, the 

 nuclei of the two envelope-cells, and two larger, central, the nuclei of the 

 spore-forming elements ; D, pansporoblast with fourteen nuclei, eight peri- 

 pheral, six central ; two of the latter, smaller than the others, represent reduo- 



[Continued at foot of p. 405. 



