Ossuary
I am told that this skull is "hydrocephalic." Yes, a Water-Haid, as a young West Virginian woman once said, according to my wise friend, Robbie.
Tibetan mystery - skull bead. Eternity beckons...
"When the augmentation of the volume of the cranium is caused by an abundant quantity of serous fluid the anomaly is known as hydrocephaly." from Anomalies and Curiosities of Medicine, 3rd printing, 1962.