Another allusion to H. Rider Haggard's Heart of the World.

The 'wooden house' was also, no doubt, a coffin, that is to say, the grave. But the dream-work achieved a masterpiece in its representation of this most unwishe-for of all thoughts by a wish-fulfilment. For I had already been in a grave once, but it was an excavated etruscan grave near Orvieto, a narrow chamber with two stone benches along its walls, on which the skeletons of two grown-up men were lying. The inside of the wooden house in the dream looked exactly like it, except that the stone was replaced by wood. The dream seems to have been saying: 'If you must rest in a grave, let it be the Etruscan one.'
(Freud, 1900 [SE 5], pp. 454-455)

Freud mentioned the alledged Etruscan dream-thought almost 30 years later, in The Future of an Illusion.