Spumellaria (Peripylaea), [76], [76] f., [77];

skeleton, [77], [83]

Spyroidea, [78]

Squamulina, [59], [65]

Stalk or stem, of Clathrulina, [74];

of Flagellates, [112] f.;

of Anthophysa, [112];

of Diplomita, [112];

of Choanoflagellates, [121], [122];

of Monosiga, [122];