Looking for ggrandfather on Superb manifest

I saw what could be my ggrandfather Amund Amundsen on your transcript of the Superb's (May-July)1849 voyage from Skien to N.Y. However, I did not find the name in the original manifest. Is it complete? I also visited the Ancestry .com site and NY passenger lists, where I found the original manifest for a ship Superb arriving N.Y July 19,1849. I was suprised to see that it contained only British passengers. Were there two "Superbs"? There was no indication in their index of a Superb arriving from Norway? Thanks for any help you can provide.....Butch