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Each arm of the building is covered by a flat domical vault; a single order of pilasters and columns runs quite round the interior of the church occupying the entire height of the walls; and the light is admitted in a most successful manner by large semicircular windows at the upper part of the church, starting above the cornice of the order.

From the pilasters between the apses cross arches spring beneath a domical vault with a pendant at their intersection; in the left pilaster by the apse is a recess.

The conclusion that in the present building we have 103parts representing different periods solves also the problem of the elliptical domical vault.

It should therefore rather be called a domical vault.

On either side of the nave, towards the eastern end of each aisle, there is an approximately square compartment covered with a domical vault, and having an opening communicating with the nave immediately to the west of the bema.