Chelydrus, pen. prod. Lucan. A kinde of serpents. Also an ornament nen to women. Graues chelydri. Colum. Medusei chelydri Sil. Nigri chelydri. Virg.Chelyon.A Torteise shell.
Lewis and Short: Latin dictionary
chĕldrus, i, m., = xe/ludros, a fetid serpent, living, for the most part, in water, Cels. 5, 27, 8; Verg. G. 3, 415; Ov. M. 7, 272; Luc. 9, 710; Sil. 3, 316; 8, 496; Prud. c. Symm. 1, 130.