of Terebelliformia, [252];

absence of, in certain Polychaeta, [253];

of Oligochaeta, [355];

of Leeches, [396];

of Gephyrea, [415], [436], [447];

of Phoronis, [455]

Vaucheria, Rotifers in, [227]

Vejdovsky, on Rhabdocoels, [46];

on Gordius, [164], [166];

on Oligochaeta, [365], [369], [374], [400]