proboscis, [110]

Hornera, [518], [532]

Horse, parasites of, [68], [83], [90], [125], [140], [142], [163]

Horse-leeches, [393] f.

Horst, on Oligochaeta, [354]

Hubrecht on Nemertinea, affinities, [120];

classification, [109];

excretory system, [108];

nervous system, [105]

Hudson, on Rotifera, [197], [198], [215] n., [220] n., [223] n., [228]