On the sidewalls are frescoes of Pellegrino Aretusi da Modena representing scenes of the life of St. James. On the left wall are: Escape of the Apostle from the Tribunal of Agrippa, Healing of a Paralytic and Martyrdom of the Saint by Decapitation.

Also, tomb of Fr. Giovanni Genocchi (1860-1926), eminent figure of the Italian Province of the Missionaries of the Sacred Heart, who was sent to South America by Pope Pius X to help the indians who were being exploited by white plantation owners.