There are actually three rouwbord or memorial boards in today's set, a pair to a husband and wife, and another to someone completely unrelated to them.
This board memorializes Irène van Pottelsberghe de la Potterie, 1851-1930. She was the daughter of Jules van Pottelsberghe de la Potterie (1818-1890) and Marie-Colette Ghislaine de la Kethulle de Ryhove (1825-1902). Her arms, in the oval shield on the right, are blazoned: Sable a hunting horn argent stringed gules a chief or.
The arms on the left on this board, and on the other memorial board (alas, the photograph I took of that one by itself turned out to be out of focus, but you can get a better view by clicking on the first image above), are those of her husband, Adrien de la Kethulle de Ryhove, 1851-1933. His parents were Eugène de la Kethulle de Ryhove (1823-1897) and Gabrielle de Ghellinck (1830-1861). Adrien and Irène were married on November 11, 1875.
His arms (here and on the other rouwbord, are blazoned: Sable a fess conjoined to a demi-pale issuant from chief argent between three mullets of six points or.