The cloister, nearly, but not quite square, has six bays on each side, of which the four central bays are of four lights each, while narrower ones at the ends have no tracery. In the traceried bays the arches are slightly elliptical, subdivided by two round-headed arches, which in turn enclose two smaller round arches enriched some with trefoil cusps, some with curious hanging pieces of tracery which are put, not in the middle, but a little to the side nearer the central shaft. The shafts are round, very like those at Batalha, and, like every inch of the arch and tracery mouldings, are covered with ornament; some are twisted, some diapered, some covered with renaissance detail. Broad bands too of carving run round the inside and the outside of the main arches, the inner being almost renaissance and the outer purely Manoelino. The vault of many ribs, varying in arrangement in the different walks, is entirely Gothic, while all the doors--except the double opening leading to the chapter-house, which has beautifully carved renaissance panels on the jambs--are Manoelino. The untraceried openings at the ends are fringed with very extraordinary lobed projections, and on the solid pieces of walling at the corners are carved very curious and interesting coats of arms crosses and emblems worked in with beautifully cut leaves and birds. (Figs. 66 and 67.) Outside, between each bay, wide buttresses project, of which the front--formed into a square pilaster--is enriched with panels of beautiful renaissance work, while the back part is fluted or panelled. From the top mouldings of these pilasters, rather higher than the capitals of the openings, elliptical arches with a vault behind are thrown across from pier to pier with excellent effect. Now, the base mouldings of these panelled pilasters either do not quite fit those of the fluted strips behind, or else are cut off against them, as are also the top mouldings of the fluted part; further, the fluted part runs up rather awkwardly into the vault, so that it seems reasonable to conjecture that these square renaissance pilasters and the arches may be an after-thought, added because it was found that the original buttresses were not quite strong enough for their work, and this too would account for the purely renaissance character of the carving on them, while the rest is almost entirely Gothic or Manoelino. The arches are carried diagonally across the corners, in a very picturesque manner, and they all help to keep out the direct sunlight and to throw most effective shadows. The parapet above these arches is carved with very pleasing renaissance details, and above each pier rise a niche and saint.