On dimensional reductions of the M-9-brane

We discuss the relations of the M-9-brane with other branes via dimensional reductions, mainly focusing on their Wess-Zumino (WZ) actions. It is shown that on three kinds of dimensional reductions, the WZ action of the M-9-brane respectively gives those of the D-8-brane, the ``KK-8A brane'' (which we regard as a kind of D-8-brane) and the ``NS-9A brane'', the last two actions of which were obtained via dualities. Based on these results, we conclude that the relation of p-branes for $p\ge 8$, proposed previously, is consistent from the viewpoint of worldvolume actions.