11. Detail on lid of a stone coffin, Cambridge Castle (T.
Kerrich, _Arch._ xvii., 1814, Plate XVI., p. 228).
12. Scandinavian triskele.
13. Reefing knot on Britanno-Roman altar, _Cohors quarta Gallorum
equitata_, Risingham, Northumberland (_Arch. Journ._ xii.,
1855, p. 219).
[Illustration: Plate VII]