Here and there, particularly beneath the Courthouse, they thought they recognized the hollows of ancient dungeons, excavated in the very sewer itself. Hideous in-pace . An iron neck-collar was hanging in one of these cells. They walled them all up. Some of their finds were singular; among others, the skeleton of an orangutan, who had disappeared from the Jardin des Plantes in 1800, a disappearance probably connected with the famous and indisputable apparition of the devil in the Rue des Bernardins, in the last year of the eighteenth century. The poor devil had ended by drowning himself in the sewer.