Why don't all Volumes show up in Finder?

[ArthurDaley]

If I use terminal I have a volume which does not appear in Finder, why? It has files/directories etc.

 

[J the Ninja]

What volume is it?

 

[ArthurDaley]

Here is an LS of /Volumes

http://skitch.com/leedryburgh/bh19k/terminal-bash-123x31

I've arrowed the "Volumes" which I can surf via command line but which I can't get to show up in Finder (they have files and dirs inside them bTW)