If a memorial hall or building is a city hall, coliseum, or auditorium, the mayor of the city may be an ex officio voting member of the commission created in section 37.9 . [C24, 27, 31, 35, 39, § 497; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §37.15 ] 95 Acts, ch 114, §2 Referred to in §331.321