《晋书·志·第十五章》
到了塞置时期，直童听从博士萱至丝等人的建议，立秋这天进呈月令，改用素白蛤。
及江左，哀帝从博士曹弘之等议，立秋御读令，改用素白。
During the period of the four barbarians, Zhi Tong followed the advice of Bo Xuanzhi and others, and on the day of the autumn, he presented the monthly order and changed to plain white clams.