The tower is pierced with an archway in each of its east and west walls. The lower part of the west wall of the tower projects about 2 feet 2 inches on each side beyond the side walls, with a breadth of about 2 feet 5 inches, and finishes upwards in a roughly-tapering form at the level of the top of the western arch. (See Fig. 154.) These projecting portions of wall have somewhat the appearance of side buttresses to the tower, but they are more like the remains of the east wall of a nave, which now no longer exists. They have not the character of originally-built early buttresses, but have rather that of the remains of projecting walls, dressed up at a later period. Besides, it is a characteristic of the structure that it has no buttresses flanking the other arches. There is observable on the west face of the tower the mark of a roof. This mark, if produced on each side to about the level of the top of the chancel walls, would indicate the roof of a nave about ten or twelve feet wider than the tower. There seems to be no other way of explaining the mark of the roof and the projecting portions of the side walls except by supposing that there was at one time a nave to the west of the tower. This would also give a reason for the existence of the [Illustration: FIG. 156.--St. Regulus’. Details of East Arch.] east and west arches in the tower, which otherwise are somewhat unintelligible. The arch opening from the chancel to the tower is 9 feet 10 inches wide by 27 feet high, and is of a plainer description than the apse archway. [Illustration: FIG. 157.--St. Regulus’. Arch Moulding of West Arch of Tower.] The jambs have a square recess or nook on each face of the wall with a shaft in each recess; and the arch above is quite plain, with square edges. The western arch, from the tower into the supposed nave, is shown in Fig. 154. It is 10 feet 4 inches wide by 28 feet high. Both of the archways in the tower are now built up. The moulding of the west arch, as far as visible, is shown in Fig. 157. The capitals of all the shafts are rather shapeless and clumsy, but the necking and arch mouldings are of good design. The arches are all slightly of the horse-shoe form.