Microsphere, microspheric, [67] f.

Microzooid of Vorticella, [157]

Microzoospores, [85]

Miescher's tubes, [108]

Migratory pairing nucleus, [149] f.;

of Peritrichaceae, [151] f.

Miliola (Quinqueloculina), [65]

Miliolidaceae, [59]

Miliolina, [59], [66], [70]

Milleporina, [257] f., [258], [260], [282];