mystery nuts/husks

[Tony Irwin]

I've posted a picture at
http://www.btinternet.com/~anthonyirwin/husks/
of some odd "shells" of a nut or fruit which I don't recognise.
Unfortunately I've no idea which region they're from. Any help as to their
identity would be appreciated.
Many thanks

Tony Irwin

Dr A.G.Irwin, Natural History Department, Castle Museum Study Centre,
Shirehall, Market Avenue, Norwich NR1 3JQ, England.
Tel:+44 1603 493642. E-mail: tony.irwin at btinternet.com