external characters, [465] f., [479] f.;

anatomy, [468] f., [469];

brown bodies, [471] f., [472];

history, [474] f.;

classification, [475] f., [515], [517] f.;

occurrence, [477] f.;

avicularia and vibracula, [482];

enemies, [486];

Entoprocta, [487];

fresh water, [492] f.;