of Stylonychia mytilus, [139] f.;

of Metopus, [154];

of Caenomorpha uniserialis, [155];

of Vorticella, [156], [157];

posterior, of Vorticella, [156], [157]

Wrightella, [351]

Wrisburg, on organisms of putrefaction, [43]

Würmchen, of Gaule, a name for Lankesterella, [102]

Xenaster, [476]

Xenia, [331], [335], [346], [348]