法苑珠林 5.80

5.80

又曰。涸小水精生蚳。蚳者一頭而兩身。其狀若蛇。長八尺。以其名呼之。可使取魚鼈（右二事。見搜神記）。

It also states: 'The essence of dried-up small waters gives birth to the chi. The chi has one head and two bodies, shaped like a snake and eight chi long. If one calls it by its name, it can be sent to catch fish and turtles.' (The two matters above are seen in the Soushen ji.)