The east and west walls of this transept were altered in the Perpendicular period, in a manner which recalls the work in Gloucester Cathedral, although the screen of tracery with which the Norman walls have been overlaid is not so complete. On the east side this work begins in the triforium, the openings in which are formed by a series of narrow pierced panels, with transoms and foliated headings. As at Gloucester, the wall behind this screen-work is Norman, and in the course of restoration here the remains of the ancient triforium were discovered, (1863). They are of transitional Norman character, much enriched. The clerestory above is entirely Perpendicular. A pierced parapet runs along at the base, and slender Perpendicular vaulting-shafts pass through both the triforium and clerestory stages. The west wall has been overlaid more completely with a Perpendicular screen-work, pierced for window openings in all three stages. There is also a Perpendicular clerestory window above the arch of the nave-aisle. Remains of two arches of the Norman triforium have been found on this side of the transept. They are plainer than those opposite, but may possibly be of the same date. The vaulting of the transept is a plain lierne. On the south side of this transept is a monument designed by ADAMS, and executed by NOLLEKENS, for Bishop JOHNSON, (1759-1774). The bust is fine. There is also a memorial of Bishop HURD, (1781-1808.) In the east wall of the _north transept_ a Norman arch has been discovered during the late restorations, occupying the same position as that in the transept opposite, and of the same date. It now remains open, to the thickness of the outer wall. The vaulting-shafts here are Early English, banded, with capitals of Early English foliage. On the north side was a modern Perpendicular window, which has been removed, and replaced by a new window of early Decorated character. The east and west walls have been overlaid with Perpendicular work in the same manner as the opposite transept. The triforium panelling on the east side, which had been built up, has been re-opened and restored. The screen-work on the west wall is only pierced for a window in the clerestory stage.