Metanemertini, [112]

Metastatica (= Holostomatidae), [73];

life-histories, [64]

Metopidia, [200], [225]

Metschnikoff, on Orthonectida, [94];

on Nemertines, [99];

on Chaetosomatidae, [158]

Meyer, on Polychaeta, [261]

Michaelsen, on Earthworms, [349], [353], [359], [370] f., [375], [385]

Microchaeta, [362]