All casual vacancies among the members other than exofficio members of any authority or other body of the University shall be filled as soon as conveniently may be, by the person or body who or which, nominated or elected the member whose place has become vacant and the person nominated or elected 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:
Provided that vacancies arising by efflux of time among elected members of any authority or other body of the University may be filled at elections which may be fixed by the Vice-Chancellor to take place on such days not earlier than two months from the date on which the vacancies arise, as he thinks fit:
Provided further that no casual vacancy shall be filled if such vacancy occurs within six months before the date of the expiry of the term of the member of any authority or other body of the University.