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Let $G$ be a bounded open subset in the complex plane and let $H^{2}(G)$denote the Hardy space on $G$. We call a bounded simply connected domain $W$perfectly connected if the boundary value function of the inverse of theRiemann map from $W$ onto the unit disk $D$ is almost 1-1 rwith respect to theLebesgure on $\partial D$ and if the Riemann map belongs to the weak-starclosure of the polynomials in $H^{\infty}(W)$. Our main theorem states: Inorder that for each $M\in Lat(M_{z})$, there exist $u\in H^{\infty}(G)$ suchthat $ M = \vee\{u H^{2}(G)\}$, it is necessary and sufficient that thefollowing hold:  1) Each component of $G$ is a perfectly connected domain.  2) The harmonic measures of the components of $G$ are mutually singular.  3) % $P^{\infty}(\omega)  The set of polynomials is weak-star dense in $ H^{\infty}(G)$.  \noindent Moreover, if $G$ satisfies these conditions, then every $M\inLat(M_{z})$ is of the form $u H^{2}(G)$, where %$u\in H^{\infty}(G)$ and therestriction of $u$ to each of the components of $G$ is either an inner functionor zero.

Beurling's Theorem And Invariant Subspaces For The Shift On Hardy Spaces