Hood, of Sabellaria, [263], [306]

Hooks, of Trematodes, [53], [56], [57];

of Cestodes, [75], [85];

of Cestode-larvae, [87], [88];

taxonomic value in Cestodes, [90] f.

Hoplonemertea, [106], [109], [110];

auditory organs, [106], [110];

British species, [110];

characters, [110];

development, [113];