Haeckel, [168], [185], [192], [237], [308];

on Monera, [4] n., [89] n.;

on Protista, [40] f.;

on Protozoa, [46];

on Heliozoa, [71];

on classification of Radiolaria, [76];

on functions of porocone in Radiolaria, [81];

on enumeration of Radiolaria, [87] f.;

on Myxobrachia, [83];

on Sponges, [168], [192];