I missed this while I was researching the article:
"In 1754 the English naturalist John Hill published 15 new constellations . . . . These were tucked into spaces between existing figures and represented various unappealing creatures including a toad (Bufo), a leech (Hirudo), a spider (Aranea), an earthworm (Lumbricus), and a slug (Limax). Hill was a noted satirist and he may have been attempting to perpetrate a joke on astronomers – a joke that never caught on."
Ian Ridpath, Star Tales