libra,
Were you looking for someone named Kerr on the SHERIDAN? Could you say what the first name of the passenger was?

There seems to be several voyages by the SHERIDAN to New York around the period 1848 to 1850 that you are interested in.

Just some Kerrs I noticed were: Matthew, Anne, Biddy, Peter, and an unknown Kerr was born on the ship in 1847.

Brian