Quote Originally Posted by SlackerDrummer View Post
The compartment, as it is known, is not considered part of the armorial bearings unless it is specified in the letters patent in which the supporters are granted - which doesn't happen very often. It is usually just an artistic embellishment simply for the purpose of giving a place for the supporters to stand.
The compartment and second motto are part of the full achievement of Macmillan of Macmillan and Knap; but, as stated above, the explanation was becoming over complicated without the illustration so the blazon was omitted.

For those interested the blazon would continue "on a mound (this is the bit bit the lions stand on and in Scottish heraldry represent the ancient clan lands), strewn with holly (holly being the clan plant badge and in this instance representative of the clan folk) leafed and fruited proper this means painted with green leaves and red berries, just as in nature) beneath which on an escroll is the motto Fhad's A Bhuaileas Tonn Ri Crag (a reference to large stones set near the sea which marked the territorial boundaries of the the clan lands; enscribed on the stones in Gaelic was the legend: "Macmillan's right to these lands shall be as long as this stone withstands the sea"; upon deposing the Macmillans, Campbell of Kilberry had the stones deface and pushed into the sea).