  Since flavor neutrino masses $M_{\mu\mu,\tau\tau,\mu\tau}$ can be expressed
in terms of $M_{ee,e\mu,e\tau}$, mutual dependence among
$M_{\mu\mu,\tau\tau,\mu\tau}$ is derived by imposing some constraints on
$M_{ee,e\mu,e\tau}$. For appropriately imposed constraints on
$M_{ee,e\mu,e\tau}$, we show a texture of neutrino mass matrix giving rise to
maximal CP violation. When the atmospheric neutrino mixing is also maximal, we
discuss various specific textures of neutrino mass matrices including the
texture with $M_{\tau\tau}=M^\ast_{\mu\mu}$ derived as the simplest solution to
the constraint of $M_{\tau\tau}-M_{\mu\mu}$=imaginary, which is required by the
constraint of $M_{e\mu}\cos\theta_{23}-M_{e\tau}\sin\theta_{23}$=real for $\cos
2\theta_{23}=0$. It is found that Majorana CP violation depends on the phase of
$M_{ee}$.
