續一切經音義 7.124

7.124

龜鼈（上鬼為反說文云龜舊也外骨而內肉者也從它龜頭似它天地之性也廣肩無雄龜鼈之類也以它為雄像四足頭尾之形也下卑滅反說文云水介蟲也從黽敝聲有從魚作鱉非也）。

龜鼈 (The upper character is pronounced with the fanqie gui + wei. The Shuowen says: "龜 means ancient; having bone on the outside and flesh on the inside. Classified under 它 [snake]; the turtle's head resembles a snake. It represents the nature of heaven and earth. Broad-shouldered and without males, turtles and soft-shelled turtles take snakes as their mates. It depicts the shape of four legs, head, and tail." The lower character is pronounced with the fanqie bei + mie. The Shuowen says: "An aquatic shelled creature; classified under 'frog' [黽], with 敝 as phonetic." Some write it under 'fish' [魚] as 鱉, which is incorrect).