Urticina, [379], [382];

U. crassicornis, [379], [382]

Ussov, [257] n.

Ute, [189], [190], [192], [221]

Vacuole, [5] f.;

of Collozoum inerme, [76];

of Oikomonas, [112];

contractile or pulsatile, [14] f.—see Contractile vacuole;

formative, [14] f.—see Alveole, Food-vacuole, Formative vacuole, Ingestion, vacuole of

Vaginicola, [138], [158]