  We study the tensor gauge fields ("notophs") of ungauged N=8 D=4 supergravity
in superspace. These are described by 2-form potentials in the adjoint
representation of G=E(7(+7)). The consistency of the natural candidates for the
superspace constraints for their field strengths fixes the form of the
generalized Bianchi identities and also requires the potentials with indices of
G/H=E(7(+7))/SU(8) generators to be dual to the scalars of the N=8,D=4
supergravity multiplet. In contrast, the field strengths of the 2-form
potentials corresponding to the SU(8) generators are dual to fermionic
bilinears, so that these potentials are auxiliary rather than physical fields.
Their presence, however, is essential to formulate a tensor hierarchy of
N=8,D=4 supergravity consistent with its U-duality group E(7(+7)).
