development, [189];

habits, [189];

classification, [191];

key to, [193];

American species, [534]

Chaetonotus, [232], [235]

Chaetopoda, [241] f.;

as food for Nemertinea, [115]

Chaetopteridae, [258], [323]

Chaetopterus, [304] n., [323];