Leeches, [406]

Marphysa, [276], [319];

as bait, [297];

as host, [297]

Mastax, of Rotifers, [199], [210]

Masterman, on Chaetognatha, [190];

on Phoronis, [461]

Mastigocerca, [225]

Mastigophora, [518], [529];

vibraculum, [484]