mother cell

The type in all these cases is this: A mother-cell produces by cell-division four daughter-cells.

Cell-development always takes place within existing cells, and either one or many new cells may be formed within the mother-cell.

Inside the mother-cell were to be found young developing cells of spherical shape, lacking however a nucleus.

The true nucleus of the cartilage cell was probably in the same way the original generator of the mother-cell.

The sagittal plane of the valve of the auxospore is at right angles to the plane of the valve of the mother cell.