Comment by arp242

I replaced it with a better-known dinosaur because Megalosaurus is not widely known today. I had to do a quick check to verify it actually is a dinosaur.

Looking a bit more, it seems that in 1800s there was the (mistaken) belief that Megalosaurus was amphibian. I thought it was a bit odd to reference a dinosaur there, but it makes more sense now. So to properly understand that reference you need to know about the state of dinosaur knowledge in the 1840s.