The sitting members of the Legislative Assembly of Bihar representing the Thakurganj, Karandighi, Para-cum-Chas and Barabazar-cum-Chandil constituencies shall, notwithstanding the reduction in the extent of those constituencies by the transfer of portions thereof to West Bengal, continue to be members of the Legislative Assembly of Bihar; and the sitting members of that Assembly representing any other constituency lying wholly or partly in the transferred territories shall, as from the appointed day, be deemed to have been elected to the Legislative Assembly of West Bengal and cease to be members of the Legislative Assembly of Bihar.