"Ermine, on a chevron azure, three foxes' heads erased, argent. The augmentation is in a canton azure, a fleur-de-lis argent. AUGMENTATION. This word signifies in Heraldry a particular mark of honour, granted by the sovereign in consideration of some noble action, or by favour; and either quartered with the family arms, or on an escutcheon or canton." -Hall, 1862

Augmentation

"Ermine, on a chevron azure, three foxes' heads erased, argent. The augmentation is in a canton azure,…