Rhabdocoelida, [4], [7], [36], [42] f.;
occurrence and habits, [43];
parasitic forms, [44];
reproduction, [47];
classification, [49];
British species, [43], [44], [49]
Rhabdogaster, [158]
Rhabdonema nigrovenosum, [134], [136], [140], [151], [160], [161]