一切經音義 22.243

22.243

珂貝璧玉（珂恪河反玉篇曰珂螺屬也所出於海其白若雪所以嬰馬膺者也說文曰貝謂海介蟲也璧瑞玉也案爾雅云玉宍倍好謂之璧璧形圓而有孔王者祭天神以用之矣）。

White shells and jade bi-discs (ke bei bi yu; ke is pronounced ke [恪] + he [河] in fanqie. The Yupian says: 'Ke belongs to the spiral shells, produced in the sea; its whiteness is like snow, and it is used to adorn a horse's breast.' The Shuowen says: 'Bei refers to marine shelled creatures. Bi is an auspicious jade.' According to the Erya: 'When the fleshy jade body is twice the width of the central hole, it is called a bi.' The shape of a bi is circular with a central hole, and sovereigns use it to sacrifice to the celestial deities).