epidemics of, due to Myxosporidiaceae, [107];

to Costia necatrix, [119];

to Ichthyophtheirius, [152]

Fission, [10], [23] f.;

equal, [10];

Spencerian, [23];

multiple, [30] f. (see also Brood-division);

of Heliozoa, [72] f.;

of Radiolaria, [84] f.;

radial, in Volvocaceae, [110];