Lysidice, [297], [320]

MacGillivray, on Polyzoa, [519]

M‘Intosh, on Nemertinea, [110] n., [115], [116];

on Phoronis, [454]

Macraspis, [73]

Macrobdella, [393], [406];

sense-body, [394]

Macrorhynchus, [44], [47];

British species, [49]

Macrostoma, [44], [47];