nervous system, [254];

sense-organs, [255], [272];

ciliated pits, [272];

alimentary canal, with pharynx, [249], [250], [251], [269], [270], [271];

oesophageal glands, [271] f.;

nephridium, [253], [254], [269], [274];

genital duct, [254], [269];

genital cells, [256], [273] f.;

hermaphrodite, [273];

regeneration, [278], [282];