In the apse is a plaster cast (the original is in the Vatican Museums) of a statue of a reclining Attis, after the emasculation. In his left hand is a shepherd's crook, in his right hand a pomegranate. His head is crowned with bronze rays of the sun and on his Phrygian cap is a crescent moon. This suggests astrological aspects: Attis was regarded as a solar deity and identified with the moon-god Men. He is leaning on a bust, probably the personification of the river Gallos, where he had died. His posture is reminiscent of river gods, but the statue also brings to mind sarcophagi, with a depiction of the deceased on the lid. The statue is a dedication by C. Cartilius Euplus, with an inscription on the plinth:

NVMINI ATTIS C(AIVS) CARTILIVS EVPLVS