There is a niche against the north-west pier of the tower, but none on the north-east. There is a leaf moulding above the clerestory on the eastern side. The same moulding on the west is plain. The eastern moulding of the main arches on the eastern side is dog-tooth. It is plain on the west. The other mouldings of the main arches are also differently arranged. The spandrels of the triforium are decorated with circles of carved foliage, five to each bay, on the west side. These are absent on the east. The north transept differs from the south in the following respects:-- The arches of the arcade at the north end of the north transept are trefoiled. They are plain at the south end of the south. The main piers of the north transept have a ridge running down their alternate stone shafts. This ridge is wanting in the south. Their capitals are richer, and, curiously enough, apparently later in detail. In the clerestory of the north transept there are large dog-tooth mouldings between the Purbeck marble shafts wanting in the south transept. There is also more dog-tooth in the arch mouldings of the clerestory of the north transept than of the south. In the north transept the moulding between the clerestory and triforium is dog-tooth. It is plain in the south transept. The arcades of the aisles are practically the same in both aisles, except for the differences noted between the east and west aisle of the south transepts. There are two rows of dog-tooth moulding round the windows in the aisles of the north transept, but only one in the south. The clerestory shafts in the aisle of the north transept are bolder than in the south, and the capitals, especially on the east side, are more elaborate and beautiful. The extra Decorated pillar on the west side of the north transept has already been noted. The ends of the transepts are, of course, entirely different in arrangement. Purbeck marble is used lavishly all over the transepts; as, for example, alternately with stone in the main piers, on the shafts of the aisles, and in the triforium and clerestory. The main vaulting shafts are altogether of Purbeck. The arcade at both ends of the transepts is entirely without Purbeck marble. In the south front the shafts of the lowest row of windows are alternately of Purbeck and stone. The arcading above the door is wholly Purbeck, with dog-tooth mouldings of stone. The shafts of the central windows are Purbeck with alternate dog-tooth mouldings, and there are Purbeck shafts at the side of the rose window. There are also Purbeck shafts on each side of the door, beginning above the arcade below. In the north front, the shafts of the five sisters and of the five lancets above them are alternately marble and stone.