The "Troy" arrived at the port of New York July 13,1839 from Liverpool, England. This ship was built in 1834 in New York, the builder was "Brown & Bell", the owners were a family named "Macy". It was renamed "Aristides" when sold foreign prior to 1858. [Posted to the Emigration-Ships Mailing List by Brian - 18 October 1997]
http://www.fortunecity.com/littleitaly/amalfi/13/shipt.htm
Page 4 has information on William and Mary Kenna. The columns are:
Name, Age (Years, Months), Sex, Occupation, Country From, Country to Inhabit
William (Wm) Kenna is 23, a Farmer from Ireland, and his wife Mary is 23 too.