render problem!!!!!

When rendering this mesh I have encountered this problem.:confused:
helm4.jpg
helm4wireframe.jpg
The shape behind the main mesh is not meant to be there and I cannot understand why it is there.
I would appreciate any help
Thanks

Did you accidentally hide an object? Press ALT-H to un-hide everything. The outliner can also be useful for finding errant objects.

g60 your response was spot on, a noobish mistake.
Thanks.