Hudsonella, [224]

Huxley, on Rotifers, [198], [229];

on Polychaeta, [246];

on Molluscoidea, [475]

Huxleya, [525], [527]

Hyalinoecia, [299], [318], [319];

tentacles, [262];

composition of tube of, [290]

Hydatina, [199], [200], [202], [204], [213], [224], [226], [228]

Hydatinidae, [224]