Professor-Chronotis

Professor Urban Chronotis, the Regius Professor of Chronology, or “Reg” as he insisted on being called, had a memory that he himself had once compared to the Queen Alexandra Birdwing Butterfly, in that it was colourful, flitted prettily hither and thither, and was now, alas, almost completely extinct.
—  Dirk Gently’s Holistic Detective Agency by Douglas Adams