of Trochosphere, [245];

of Nereis, [248];

of Polychaeta, [259];

of Glyceridae, [320];

of Terebellidae, [327];

of Oligochaeta, [348]

Protodrilus, [242], [244]

Protonemertini, [112]

Protula, [341];

genital organs, [273], [274];