First, if you're sure that command is exactly as you see it, then I've learned somethign new. Becuase normally you wouldn't see "ufs" in a mount command without the word "-t" before it.
Second, you can learn a lot about the mount command by issuing this command at the command prompt:
At least on my system, the man page talks about filesystems of type ufs, and the -t option, and the -F option.
Hope this helps.