Zonarial Radiolaria, [75]
Zoochlorella, [111];
a Chlamydomonad, [126];
symbiotic, in Heliozoa, [73];
in Paramecium bursaria, [153];
in Stentor polymorphus, [154];
in Ophrydium, [158];
in Ephydatia, [175];
in Hydra viridis (= chlorophyll corpuscles), [256]
Zooids of Volvox globator, [127]