Leeches, [393];

Gephyrea, [449];

Polyzoa, [488] n., [505], [523] f.

Brood-pouch, of Spirorbis, [261], [276], [341];

of Salmacina, [276];

of Entoprocta, [487], [507]

Brood-sac, of Autolytus, [275];

of Myrianida, [280]

Brown body, in Polyzoa, [468], [471] f., [472], [489], [496], [510], [514]

Brown tubes (nephridia), of Sipunculoidea, [415], [417], [423], [425];