James W. Bluff is listed in the Posey County Cemetery Records book.He is buried in Bellefontaine Cemetery in Black Township.The listing says:
Bluff, James W.1846 - 1925
There is also an Anna Bluff listed:
St. Mathews Cemetery, Black Township Bluff, Anna1852 - 1928
And here is their listing from the 1900 census 1900/IN/Posey Co/Black Township/ED43/p.86a Bluff, James W. Sr./head/Jan1846/54/married28yrs/ENG ENG ENG/arrUS1864/manager of flour mill Bluff, Annie R/wife/Apr1852/48/married28yrs/NJ IRE IRE Bluff, Rosa/dau/Dec1880/19/single/IL ENG NJ
Lastly, there is record of a christening of a James William Bluff: 04 JUN 1848 Saint Clement Danes, Westminster, London, England Of course there is no guarantee this is your James.