I found Joseph Henry and his family at: 1870 U.S. Census (http://search.ancestry.com/iexec?htx=View&r=an&dbid=...)

I'm trying to find Joseph's father and the name of the town in Ireland that he came from. Can anyone give me a suggestion? I would like to check "Coffin Ships" coming into Canada from Ireland in 1864 or 1865. Can anyone tell me how to do that?