The buttresses of the Lady Chapel are rather richer in design than those of St. Lawrence's Chapel. The lower level of its parapet indicates some difference of date. The plan of this part of the church presents problems which bear on those connected with the rest of the church (p. 44). Beneath St. Lawrence's Chapel and extending under the north aisle westward are two crypts, entrance to them being by two doors from the churchyard, their position is shown on the general plan. It will be seen that the western one is of two aisles, each of three bays, while the eastern is only one bay in length. The entrance to the western was at first in the middle bay but this was blocked when the Girdlers' Chapel was built. That the eastern crypt was added later, and the present Lady Chapel later still is shown by the presence of windows in the east wall of both parts and other indications. But while the history of the church shows that the original Lady Chapel and crypt or charnel-house, were built soon after 1300, the present superstructures belong to a time about one hundred years later. Now as the western crypt may be safely assigned to the earlier date the Lady Chapel doubtless stood over it and flanked the old chancel of the church, in its normal position in fact as the existing one is now. But a point which remains to be explained is that the walls of the crypt are parallel to the line of the new chancel and not to the line of the old or new naves. It seems certain therefore that the inclination of the new chancel is a simple perpetuation of the old arrangement, and if not, the position of the crypt is hard to account for. It is generally supposed that these crypts were used as Mortuary Chapels and the eastern one has in fact a piscina and aumbry, showing that there was once an altar. But for some centuries they served as a charnel-house, and are so called in a papal grant of Indulgences. In 1640 there is an entry in the church accounts of five shillings for "cleansinge the charnel-house and laying the bones and sculles in order." They now contain fragments that have been removed or discovered in the course of various restorations. A small Norman scalloped capital, another of Early English workmanship and a voussoir showing the Norman zig-zag or chevron are interesting relics of structures earlier than anything now existing, while a number of the decayed statues from the tower find here a dark and damp repose very different from the airy outlook enjoyed by them for five centuries. It will be seen that they are near life size and are executed in a gray sandstone which has stood the weather much better than the red. The outer north aisle containing the Girdlers' Chapel on the east and the Smiths' or St. Andrew's Chapel on the west of the porch, is plainly of later date. The windows have depressed, distinctly four-centred arches, and in 1730 their five lights had simply cusped heads, the mullions running up to the architrave.