Hieronymus

Hieronymus was a Fire crab that was used by Silvanus Kettleburn during his Care of Magical Creatures class for fourth years in the 1987–1988 school year. His name was given by one of Kettleburn's Slytherin students, Liz Tuttle.

During one of the classes, Liz mentioned to Jacob's sibling that Hieronymus said Kettleburn was reckless because he put creatures first.