The oldest portions of the structure are those forming the eastern range; they are of Transitional date or about the beginning of the thirteenth century.[330] The sacristy has a stone bench round the walls and three steps in the floor. It has a door from the transept and an outer semicircular-headed doorway of Transition character from the cloister. Access is also obtained by a small door in the north side to a wheel-stair leading to the upper floors, and visible as a projecting turret at the S.E. angle of the transept. The east window of the sacristy is pronounced remarkable, having two round-headed windows surmounted by a visica-formed aperture. It has a piscina in the south wall near the east end. The apartment next the sacristy may originally have been a parlour, but is now appropriated as a mausoleum. There is an ambry in the south wall near the east end, and the doorway is semicircular and of Norman character. The floor of the chapter-house is several feet below the level of the cloister walk; the ordinary central doorway and side windows opening from the cloister are placed in their usual position on the level of the cloister walk. The side openings were unglazed, and were used for seeing and hearing what was proceeding in the chapter-house below. The doorway is large and deeply recessed; the outer arches of the windows on each side of the doorway are plain semicircles, filled in with two pointed lights having a central shaft. The chapter-house retains its round barrel vault, and has three pointed windows in the east end and two similar ones in the side walls, where the chapter-house projects beyond the general line of the buildings. In the interior a round arched arcade runs along the east side, supported on single shafts, and there are traces of a similar arcade running round the side walls. There is an entrance doorway in the south wall; the east gable wall over the chapter-house still exists, possessing flat buttresses of a Norman type at the angles and between the windows, but the pointed arches indicate Transition work. There is a lovely fragment of carved work still preserved in the chapter-house, representing the pascal lamb slain and surrounded by a wreath of foliage, above which are the letters I.H.S. The vine leaves flowing from the lamb may symbolise the branches springing from the true vine.