Comparison between a normal human skull and a skull about twice the size.
"One finds in the neighborhood of Sordavala large burial mounds, among the Finns known under the name of Metelin Hauat (giant graves). In one of them, next to Lähenkylä village, has been on examination found a human skull, twice larger than the usual."
From "Finland och dess invånare, Andra Delen", by Friedr. Rühs, Stockholm 1827, p. 138.