  In this paper we consider the N = 2 supergravity models in which the
hypermultiplets realize the nonlinear sigma-models, corresponding to the
nonsymmetric (but homogeneous) quaternionic manifolds. By exploiting the
isometries of appropriate manifolds we give an explicit construction for the
Lagrangians and supertransformation laws in terms of usual hypermultiplets in
the form suitable for the investigation of general properties of such models as
well as for the studying of concrete models.
