of Oligochaeta, [354];

of Leeches, [395];

of Gephyrea, [417];

of Phoronis, [457]

Septum, of Archiannelida, [244];

of Nereis, [249], [251];

of Polychaeta, [269];

of Chlorhaemidae, [334];

of Oligochaeta, [355];

of Gephyrea, [440]