  We discuss the implications for lepton mixing and CP violation of structure
in the lepton mass matrices, for the case that neutrino masses are generated by
the see-saw mechanism with an hierarchical structure for the Majorana masses.
For a particularly interesting case with enhanced symmetry in which the lepton
Dirac mass matrices are related to those in the quark sector, the CHOOZ angle
is near the present limit and the CP violating phase relevant to thermal
leptogenesis and to $\nu 0 \beta \beta $ decay is near maximal.
