2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170813For each d>=2, the mapping class group for plane curves of degree d will be defined and it is proved that there exists uniquely the Meyer function on this group. In the case of d=4, using our Meyer function, we can define the local signature for 4-dimensional fiber spaces whose general fibers are non-hyperelliptic compact Riemann surfaces of genus 3. Some computations of our local signature will be given.24 pages, typo addedGeometric TopologyAlgebraic Geometry57N13, 14D05text