Around 32 lakh unmapped voters will be called in the first phase of hearings under the Special Intensive Revision (SIR) of the electoral rolls, officials said.
Hearings for this category, in which voters could not link their names with those of family members in the 2002 electoral rolls, will begin from December 27, he said.
"We have started sending notices to around 10 lakh such voters from today, while the same will be issued to another 22 lakh voters from Tuesday," the official at the office of the West Bengal Chief Electoral Officer told PTI.
During the enumeration phase, a total of 31,68,424 unmapped voters were identified across the state, he said.
He said that the proceedings will be conducted at district magistrates' offices, sub-divisional offices, various government departments, as well as in schools and colleges.
Voters with logical discrepancies will be taken up in the next phase, for which guidelines have been sought from the Election Commission, another official said on Monday.