Megalosaurus, Iguanodon and Hylaeosaurus are the first three dinosaurs known to science and were used by Richard Owen to establish dinosaurs as a collective group of animals... Bary and Metri are far more recent discoveries and not nearly as significant to general science...
I love seeing the crystal palace dinosaurs come up, they are basically celebrities!
I would love to have these 3 coins on my desk, they are really cool.