Sipunculidae, [576]

Sipunculus, [563]

Skeleton, intermediate or supplemental of Perforate Foraminifera, [59], [63], [66];

of Heliozoa, [71], [74];

of Raphidiophrys, [74];

of Radiolaria, [76] f., [77] f., [81] f., [84];

of Spumellaria, [77], [77], [83];

of Actinomma asteracanthion, [77];

of Acantharia, [76] f., [78], [80], [82];

of Xiphacantha, [78];