A Vatican envoy arrived in Morris, N.J., to meet rebellious nuns holed up in a monastery and to try to resolve a headline-grabbing dispute that has disrupted the prayerful quiet of the cloistered convent. The Rev. Kevin Culligan of Milwaukee was assigned by the Roman Catholic Church’s Congregation for the Religious to meet with the monastery’s liberal prioress and each of five conservative sisters who have locked themselves into a wing of the building. Reporters and television crews have invaded the normally quiet grounds of the Monastery of the Most Blessed Virgin Mary of Mt. Carmel since last week, when the Discalced Carmelite nuns locked themselves into the infirmary-kitchen wing. The nuns said they feared being physically ejected.