On some minimal graphs of the torus

Let Γ be the set of finite, simple and nondirected graphs being not embeddable into the torus. Furthermore let >⁴ be a partial order-relation and M⁴ (Γ) the minimal basis of Γ. In this paper we determine three graphs of M⁴ (Γ) being embeddable into the projective plane and containing the subgraph W.