Section 197B(1) in The West Bengal Panchayat Act, 1973
(1)Notwithstanding the provisions contained in sections 7, 96 and 141, if at any time the whole of the area of a constituency of a Gram Panchayat, a Panchayat Samiti or a Zilla Parishad is included in a municipality [* * * * * *], or a Town Committee or a Cantonment, the member elected from such constituency to the Gram Panchayat, Panchayat Samiti or Zilla Parishad, as the case may be, shall, as from the date of such inclusion, cease to be a member of the Gram Panchayat, Panchayat Samiti or Zilla Parishad concerned.