Tetraonchus, [73]
Tetraphyllidae, [91]
Tetrarhynchidae, [91]
Tetrarhynchus, [75], [76] n., [85], [91]
Tetrastemma, British species, [110];
land forms, [101], [115], [118];
fresh-water forms, [101], [118];
excretory system, [108], [109];
habits, [114];
hermaphrodite species, [109];