Lorenz Ellingsen - Jumped Ship.

I am trying to trace the name of the ship that Lorenz (Lars) Ellingsen, my Grt. Grt Grandfather, arrived in Melbourne as a crewman in the early 1850s. He was from Kragero in Norway and was the second son (I think) of Elling Knudsen (Kundsen?) and Ane Frederikdatter. Any assistance would be appreciated. Brian Mclean.