http://www.abandonia.com/vbullet/att...0&d=1316207950
DOSBox is stating clearly what is wrong. There is no directory named "Syndicate" in the root of your C drive. The directory you moved there was named "SYND".
On further note, you're ignoring the backslash after
: . DOSBox fixes that for you, but I recommend that you remember to do that correctly from now on.
The correct mount command is therefore
mount c c:\SYND