on Archiannelida, [241] f.;

on Polychaeta, [245] f.;

on Myzostomaria, [341] f.;

on Oligochaeta, [357], [373], [382];

on Phoronis, [452] f.

Benhamia, [383] f.

Bicellaria, [481], [518], [526], [527]

Bilfinger, on Rotifers, [212]

Bilharzia, [4], [73];

B. crassa, [70];