It means Christ Church, Bala. The same Burial Register is used to record burials in the churchyard at Christ Church, Bala and at St. Beuno's Churchyard, Llanycil, Bala.
Christ Church, Bala was built about 1855, so obviously there was no churchyard actually in the town of Bala before then, the burials were all at St. Beuno's Churchyard, Llanycil, Bala.