The transverse ribs, which rise alike from both piers and columns, are composed of a flat soffit, with a roll and shallow on each edge, the diagonal ribs having a large roll between two hollows. The first compartment of the nave arcade, which comprises two bays and the east bay of the triforium arcade, correspond in their mouldings and other features with those of the choir, whereas in the remainder of the nave, although the elevation in its general design and principal features is the same, the mouldings in some essential particulars, especially in the use of the zigzag and the course of small sunk squares forming a quasi hood-moulding round the arches of the great arcade, differ from those of the choir. There is a difference also in the way in which the diagonal ribs of the main vault was carried. In the choir the diagonal ribs of the original Norman vault are supported on shafts, which still remain and rise from the level of the triforium floor; on the east side of the transept they are supported by similar shafts; in the nave they are supported on brackets formed of two grotesque heads, inserted in the spandrils between the containing arches of the triforium. The eastern compartment of the nave arcade, with the triforium arch above it, which, before the nave was completed, acted as an abutment to the tower arches on the west side, as the similar and corresponding arches of the transepts did on the north and south, must necessarily have been built at the same time as the tower arches themselves, and, therefore, naturally corresponds with them in the details. The spiral grooving on the piers, a rare feature in Norman work, is seen in the choir and transepts, but not in the nave, where lozenge and zigzag patterns and flutings are used instead. The spirals are contrary to the ordinary direction of those on a screw. The eastern part of Carileph’s church no longer exists, having been replaced by a very beautiful eastern transept. Until some important excavations were made in 1895, it was generally believed that the choir ended in an apsidal termination, with an extension of the aisles forming an ambulatory round it. The foundations of the east end of the aisles, as well as of the choir, together with a small portion of the choir wall itself, were then discovered. From what remained it was shown that Carileph’s choir terminated in three apses, the central one, which extended 27 feet beyond the others, being semicircular on the outside as well as within, while those at the end of the aisles had been semicircular only on the inside, being finished square externally.