Note 1621 — BOOK II.
Lewis Evans translation
Natrix, properly "a venomous water-serpent." Cic., Acad., iv., 38. Hence applied by Tiberius to Caligula. (Suet., Calig., xi.) It means here a thong or whip (scutica), which twists about and stings like a snake. So Anguilla, Isidor., Orig., v. 27.