Comprises Antigonish, Cape Breton, Guysborough, Inverness, Pictou, Richmond, and Victoria counties, in Nova Scotia; transferred from Arichat in 1886; suffragan of Halifax. Early missionaries: Father Angus MacEachern; Abbe Lejamtel; Fathers Alexander McDonell, William Chisholm, Colin Grant, James Grant; Father Vincent, founder of former Trappist monastery at Tracadie.