of Sponges (= choanocytes), [171], [176], [186]
Cellular relationship explained, [10]
Cellulose, [37];
cell-wall of holophytic Flagellates, [113];
in Dinoflagellates, [130]
Central blood plexus—see Heart
Central capsule, [49], [76], [77], [82], [84];
its functions in regeneration, [35];
of Collozoum inerme, [76]
Centrifugal force, stimulus of, [19] f.