of churches which vary from these types, but which
can generally be placed in one class or the other by the consideration
of two main characteristics: if the dome arches extend to the outer
walls the building is a domed cross church; if the galleries are
screened off from the central area by arcades the building is a domed
basilica.

The church at Dere Aghsy,[16] for instance, if we had only the plan to
guide us, would appear to be a typical domed basilica (Fig. 2), but on
examining the section we find that the north and south dome arches
extend over the galleries to the outer walls and form cross arms (Fig.
3). The building is, in fact, a domed cross church with no gallery in
the western arm. Above the narthex at the west end, and separated from
the western cross arm, is a gallery of the type usual in the domed
basilica, so that Dere Aghsy may be regarded as a domed cross church
with features derived from the domed basilica. S. Sophia at
Constantinople, the highest development of the domed basilica, has a
very similar western gallery.

[Illustration: FIG. 2.--DERE AGHSY (Rott).]

The church of S. Nicholas at Myra[17] (Fig. 4) has a gallery at the west
end, but the cross arms do not appear to be carried over the galleries.
The plan is oblong and the cross-groined vault is not used. The church,
therefore, takes its place as a domed basilica.

[Illustration: FIG. 3.--DERE AGHSY--SECTION (Rott).]

The church of the Koimesis at Nicaea[18] (Figs. 5 and 6) has no
galleries to the sides. The aisles open into the central area by
arcades, above which are triple windows over the aisle vaults. At the
western end is a gallery above the narthex. The aisles are
barrel-vaulted, and as the church is planned on an axis from east to
west, and is not symmetrical on all three sides, it is regarded as a
domed basilica. It is such a form as might be developed from a basilica
without galleries.

[Illustration: FIG. 4.--S. NICHOLAS, MYRA (Rott).]

In Constantinople there are three churches which seem to constitute a
type apart, though resembling in many ways the types just considered.
They are S. Andrew in Krisei, (p. 117), S. Mary Pammakaristos (p. 150),
and S. Mary Panachrantos (p. 130). In these churches, as originally
built, the central dome is carried on four arches which rise above a
one-storied aisle or ambulatory, allowing of windows in the dome arches
on three sides--the eastern dome arch being prolonged to form the bema