of Nemertinea, [113];

Trochosphere, [229], [274], [439], [510];

of Polygordius, [245];

of Polychaeta, [274], [275];

of Chaetopterus, [325];

of Myzostoma, [344];

of Gephyrea, [419], [439];

of Phoronis, [458];

of Polyzoa, [466], [509], [511], [520]

Lateral organs, of Capitellidae, [343]—see also Ciliated pits