History of Monsters. 724

...established nine different categories of comets:

II. Nine Varieties of Comets

1. Shield-shaped comet 2. Hairy comet 3. Horned comet 4. Bearded comet 5. Javelin-shaped comet 6. Sword-shaped comet 7. Solar comet 8. Horse-like comet 9. Torch-shaped comet