The upper part of the outer surface of the arch was occupied by a large
composition (fig. 12, 9).
Report, III and Pl. XVIII, 2.
Only a few remnants are still visible. The center was occupied by the representation
of Mithras as a bull-killer between the two dadophores. Mithras and Cautopates
are not preserved, Cautes wears a radiate crown. The front-legs, the horns,
genitals and part of the trunk of the bull are visible. Furthermore the head of the
snake and part of a torch, pointing down. "To the right and left of this scene were
represented seven cypress trees and seven burning altars. Originally there were
eight of the latter, but one is obliterated. In the branches of the cypress tree
nearest to the right dadophore was painted a little pink figure of a child as if
emerging from the tree" (Mithras' birth).