Please tell me you google'd before asking here.
How about http://cdg.columbia.edu/uploads/datasets/celegans_raw_data ?
via http://cdg.columbia.edu/cdg/datasets
via http://www-personal.umich.edu/~mejn/netdata/
via
http://www.google.com/search?q=%22+neural+network+of+C.+Elegans+%22+gml&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:fr:official&client=firefox-a
Dan