  Dynamical, non-asymptotically flat black holes are best characterized by
their apparent horizons. Cosmological black hole solutions of General
Relativity exhibit two types of apparent horizon behaviours which, thus far,
appeared to be completely disconnected. By taking the limit to General
Relativity of a class of Brans-Dicke spacetimes, it is shown how one of these
two behaviours is really a limit of the other.
