14 



THE PROTOZOA. 



It is an elongate, fusiform organism, varying much 

 in length according to age. At the earliest stage 



Fig. 11. Monocystis. 



A, a free" specimen of Monocystis. N, nucleus. B, two specimens in a 

 common cyst, c, breaking up into gametes. D, after conjugation : formation 

 of spores. (A, after Bourne. B & D, after Minchin.) X 35. 



it inhabits the central protoplasmic mass or 

 blastophore about which the developing spermocytes 



