  Since the Teichm\"uller space of a surface $R$ is a deformation space of
complex structures defined on $R$, its Bers boundary describes the degeneration
of complex structures in a certain sense. In this paper, constructing a
concrete example, we prove that if S is a Riemann surface of infinite type,
there exists a Riemann surface with the marking, which is homeomorphic to the
surface $R$ in the Bers boundary. We also show that many such degenerations
exist in the Bers boundary.
