Whenever at any term of the circuit court the array of grand and petit jurors summoned to attend is held to have been irregularly or illegally drawn or summoned, the presiding judge shall immediately order, in either case, that the jury commissioners of the county shall immediately prepare a special list and, in open court, draw a special venire of grand or petit jurors or draw a special jury from the last list prepared according to law. Any special grand or petit jury so drawn and summoned shall serve instead of those discharged at this term.