of Tetramitus, [112];

of Trachelomonas, [112];

of Bodo saltans, [117];

of Choanoflagellates, [122];

absent from Opalinidae, [123];

of Euglenaceae, [125];

of Volvox, [126];

of Ciliata, [143] f.;

in fission, [147];

of Stylonychia, [139] f.