Filling of casual vacancies

All casual vacancies among the members (other than an ex-officio member) of any authority or other body of the University shall be filled, as soon as may be, by the person or body who appoints, elects or co-opts the member whose place has become vacant and the person appointed, elected or co-opted to a casual vacancy shall be a member of such authority or body for the residue of the term for which the person whose place he fills would have been a member.