the niche is unusually large and, though it has broken through, the plaster decorations on the archivolt are preserved (Plate 66, Fig. 1). They consist of three fillets, and above the archivolt the small oversailing band of plaster which marks the springing of the dome is lifted so as to form a rectangular label. As can be seen from the photographs, most of the plaster has fallen from the walls; where it remains it is usually decorated with an insignificant striated motive consisting of narrow vertical and horizontal bands of five lines each, which look like the impress of some coarse matting on the wet plaster. To the north of the central gate there are two rooms, 9 and 10, communicating with one another. Further north lies a large court, _C_, 14·10 metres long, with two rooms at either end. Nos. 11 and 12 differ from the usual arrangement. No. 11 measures 6·20 by 4·05 metres and has a niche in the east wall. The north wall, which contained the door into the court, has fallen. No. 12, 1·65 × 4·20 metres, opens into the court by a narrow door in the north-west corner, part of the wall having been cut away to allow space for it. Nos. 13 and 14 are domed rooms of the customary type. In No. 14 the north-west squinch is particularly well preserved, part of the plaster fillets over the archivolt being still in place (Plate 66, Fig. 2). The central gateway opens into court D, 31·50 × 13·30 metres. At the western end of the south wall of this court there are faint traces of plaster decoration, shallow arched niches separated by engaged colonnettes. The court terminates in a second vaulted gateway (15), which is so much ruined that the details of its structure cannot be made out (Plate 67). On either side of this gate a low archway leads into the vaulted passages 16 and 17. At the eastern end of court D a door gives access to a chamber (18) 27 × 4·20 metres, which forms the east side of court E and opens into that court by two wide doorways. To north and south of court E lie chambers 19 and 20, 12·40 × 4·20 metres and 12·40 × 4·20 metres, which open into the court by three arches carried on masonry piers varying from 2·50 to 2·80 metres in length. On the west side of the court, No. 21 corresponds with No. 18, but the greater part of its walls have fallen. Court F is flanked to the south by No. 23, 11·50 × 4·20 metres, a closed chamber with a single door, and to the north by No. 22, which is only 9·10 metres long in order to allow space for a door leading into No. 24 (11·40 × 4·40 metres). The west side of court F is partly occupied by the vaulted passage (16) and partly by No. 25, a room which no doubt communicated with the court by a door. A door leads from it into No. 26, whence a pair of doorways give access to court G. No. 27 lies to the north of court G and communicates with No. 28, to the north of court H. No. 28 in turn communicates with No. 29, lying parallel with Nos. 30 and 31, two rooms that open out of the west side of court H.