To denote and record ALLIANCE BY MARRIAGE, two distinct Coats were first marshalled upon a single Shield by _Dimidiation_. This process is accomplished in the following manner. The Shield to be charged with the two Coats in union is divided _per pale_, as in No. 28: on the dexter half the corresponding half, or generally somewhat more than that half, of the arms of the husband is marshalled: then, in like manner, the sinister half is charged with the corresponding portion of the arms of the wife. In the Shield, No. 250, from another Seal of Queen MARGARET, _England_ dimidiates _France ancient_, Nos. 187 and 247. This Dimidiation in most cases produces a singular effect; as in No. 325, a Shield from the Seal of the Mayor of Winchelsea, one of the famous Sussex Cinque Ports, which bears _England_ dimidiating _azure, three hulls of ships, in pale, or_: here the dimidiated lions and ships appear to unite for the purpose of forming the most extravagant of compound monsters. The Seal of the Borough of Great Yarmouth substitutes _three herrings_, in allusion to the staple fishery of the port, for the ships, and dimidiates them with the national lions. In the central Shield of the Seal, No. 319, I have shown _De Valence_ dimidiating _De Chastillon_. In No. 326, from the monument of WILLIAM DE VALENCE, _De Valence_ appears dimidiating the French Coat of _Claremont Nesle_--_gu., semée of trefoils, two barbels haurient addorsed or_: the Dimidiation here cuts off and removes one-half of the De Valence martlets and also one of the two barbels of Claremont. [Illustration: No. 327.--Camoys, impaling Mortimer.]