nematocysts of, [247];

species of, [256];

specific gravity of, [13] n.;

host of Kerona and Trichodina, [158];

Zoochlorella in, [126], [256];

H. oligactis (= fusca), [253], [256];

H. pallida, [256] n.;

H. viridis, [253], [256];

H. vulgaris, (= grisea), [253], [256];

nematocyst, [247]