Found this info at the Castle Garden website for John Purdue from Ireland Jul 1, 1854 see link
http://www.castlegarden.org/quick_search_detail.php?p_id=245... also Ancestry link to ships manifest
http://search.ancestry.com/cgi-bin/sse.dll?indiv=1&db=ny...Note: his age is listed as 30 Yrs. and his wife Mary Ann as also 30 Yrs.
All Ireland, Griffith’s Valuation, 1847-1864 results for Perdue see link
http://search.ancestry.com/cgi-bin/sse.dll?db=GriffithsValua... Tim