difference b/w personal liability & unlimited liability?

in case of misstatement of prospectus the director or the person authorised to issue the prospectus shall be personally liable i.e, not used co's any asset onlt their personal

& in case of unlimited liability co. every member is liable to contribute to the assets of the co. until all the debts of the co. are paid in full & in other way the memorandum doesn't anyway limit the liability of members not personally liable